CN104111650A - Dual-fuel engine controller simulation test system - Google Patents
Dual-fuel engine controller simulation test system Download PDFInfo
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- CN104111650A CN104111650A CN201410299014.8A CN201410299014A CN104111650A CN 104111650 A CN104111650 A CN 104111650A CN 201410299014 A CN201410299014 A CN 201410299014A CN 104111650 A CN104111650 A CN 104111650A
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Abstract
The invention discloses a dual-fuel engine controller simulation test system, and is used for realizing an HIL test of an HPDI engine controller. The system includes a real-time simulator and an engine controller, wherein the real-time simulator is used for operating an environmental model, a driver model and a full vehicle model, sending vehicle environment parameters output by the environmental model, driver behavior parameters output by the driver model and each vehicle operating parameter output by the full vehicle model to the engine controller, and receiving a control signal sent by the engine controller, and continuing to operate the environmental model, the driver model and the full vehicle model according to the control signal, and the full vehicle model includes a dual-fuel engine model (including a gas circuit model, a fuel supply model, a cylinder combustion model, and a heat balance model), an accessory model, a drive system model, and a vehicle longitudinal power model. The engine controller is used for determining the operating condition of the engine according to the vehicle environment parameters, the driver behavior parameters and the vehicle operating parameters and generating and sending the control signal.
Description
Technical field
The present invention relates to field of engine control, be specifically related to a kind of dual-fuel engine controller simulation test macro.
Background technology
The exploitation of vehicle motor ECU (Electronic Control Unit, electronic control unit) conventionally adopts system requirements, conceptual design, application software modeling, application layer and bottom code is integrated, the modern V process mode of software test, checking.Engine ECU is being carried out in test process, and traditional stand, car load on-line testing verification mode, expend a large amount of manpower and materials, and problem is difficult for reproduction, is difficult to operational limit operating mode and dangerous factor; And the manual signal generator of open loop can not be simulated dynamically, closed loop operating mode.And HIL (Hardware-In-Loop, hardware is at ring) emulation testing, mode by plant model emulation is carried out running environment that is virtually reality like reality, dynamic test closed loop test, test process can be realized and limiting condition, test automatically can be repeated, simulate, good economy performance, safety are very important links in Engine ECU exploitation.
In the prior art, Engine ECU HIL emulation test system take single-fuel engine as main, as diesel engine ECU HIL test macro, be mainly to use diesel engine mean value model to carry out simulated diesel engine.But, a kind of novel HPDI (High Pressure Direct Injection, high pressure direct injection) rock gas, Diesel Dual-Fuel Engine adopt diesel oil ignited mode realize rock gas in-cylinder direct-jet technology, and can switch fuel mode along with the conversion of operating mode, its control relates to diesel oil, natural gas double-fuel, more complicated than traditional single-fuel engine steering logic.Existing single-fuel engine ECU HIL simulating scheme cannot meet the HIL testing requirement of high pressure direct injection rock gas, Diesel Dual-Fuel Engine ECU, there is no in the prior art the HIL test macro for high pressure direct injection dual-fuel engine ECU.
Summary of the invention
In view of this, the invention provides a kind of dual-fuel engine controller simulation test macro, thereby realize the HIL test of high pressure direct injection rock gas, Diesel Dual-Fuel Engine ECU.
For addressing the above problem, technical scheme provided by the invention is as follows:
A dual-fuel engine controller simulation test macro, described system comprises:
Real-time simulation machine and engine controller;
Described real-time simulation machine is for running environment model, pilot model and whole vehicle model, and described whole vehicle model comprises dual-fuel engine model, accessory model, kinematic train model, longitudinal direction of car dynamic model; Described dual-fuel engine model comprises gas circuit model, fuel supply model, cylinder combustion model, thermal balance model; Described fuel supply model is used for calculating diesel oil rail pressure, rock gas rail pressure, diesel oil distributive value and natural gas injection amount; Described cylinder combustion model comprises torque model and exhaust gas constituents model, and described torque model is for the output torque of calculation engine, and described exhaust gas constituents model is used for calculating exhaust gas constituents;
Described real-time simulation machine is for sending to described engine controller by each vehicle operating parameters of the driving behavior parameter of the vehicle environmental parameter of described environmental model output, the output of described pilot model and the output of described whole vehicle model; Receive the control signal that described engine controller sends, according to described control signal, continue running environment model, pilot model and whole vehicle model;
Described engine controller generates control signal for determining engine operating condition according to described vehicle environmental parameter, described driving behavior parameter and described vehicle operating parameters and carrying out steering logic, and described control signal is sent to described real-time simulation machine.
Accordingly, described fuel supply model comprises:
Diesel injector model, diesel oil high-pressure oil pump model, diesel oil rail model, rock gas rail model and gas injector model;
Described diesel injector model, for according to the diesel injection pulsewidth and the diesel oil rail pressure that collect, calculates diesel oil distributive value and exports to described diesel oil rail model;
Described diesel oil high-pressure oil pump model is used for adopting qualitative modeling calculate high-pressure oil pump pump oil mass and export to described diesel oil rail model;
Described diesel oil rail model, for according to described diesel oil distributive value and described high-pressure oil pump pump oil mass, calculates diesel oil rail pressure and exports to described diesel injector model and described rock gas rail model;
Described rock gas rail model is for obtaining rock gas rail pressure according to described diesel oil rail pressure;
Described gas injector model, for according to the natural gas injection pulsewidth and the described rock gas rail pressure that collect, calculates natural gas injection amount.
Accordingly, described diesel oil rail model specifically for:
According to continuity equation:
calculate diesel oil rail pressure P and export to described diesel injector model and described rock gas rail model; Wherein, Q
infor entering the diesel oil flow of diesel oil rail, according to described high-pressure oil pump pump oil mass, obtain; Q
outfor flowing out the diesel oil flow of diesel oil rail, according to described diesel oil distributive value Conversion of measurement unit, obtain; E is the elastic modulus of diesel oil; V is the volume of diesel oil rail.
Accordingly, described torque model comprises:
Prompting moment of torsion obtains unit, for described natural gas injection amount being converted to the equivalent diesel quality that produces same moment of torsion, according to described equivalent diesel quality and described diesel oil distributive value sum, obtains prompting moment of torsion;
Friction torque obtains unit, for search friction torque arteries and veins spectrogram according to engine water temperature, engine speed, obtains friction torque;
Moment of torsion obtains unit, for calculating described prompting moment of torsion and described friction torque sum as the output torque of engine.
Accordingly, described prompting moment of torsion acquisition unit comprises:
First obtains subelement, for adopting, described natural gas injection amount and the conversion coefficient mode being added with compensation rate that multiplies each other is again obtained to the equivalent diesel quality that described natural gas injection amount is converted to the same moment of torsion of generation;
Second obtains subelement, for searching prompting moment of torsion arteries and veins spectrogram acquisition prompting moment of torsion according to described equivalent diesel quality and described diesel oil distributive value sum, engine speed.
Accordingly, described prompting moment of torsion acquisition unit also comprises:
Revise subelement, for search prompting torque correction factor arteries and veins spectrogram according to engine speed, injection advance angle, obtain prompting torque correction factor; The described second prompting moment of torsion and described prompting torque correction factor that obtains subelement acquisition multiplied each other as prompting moment of torsion.
Accordingly, described conversion coefficient is searched natural cyclostrophic diesel oil conversion coefficient arteries and veins spectrogram acquisition according to engine speed, gas pedal aperture; Described compensation rate is searched natural cyclostrophic diesel oil compensation rate arteries and veins spectrogram according to engine speed, gas pedal aperture and is obtained.
Accordingly, described gas circuit model comprises:
Supercharger model, air throttle model, inlet manifold model, air inlet Component Model, exhaust manifold model and EGR valve model;
Described supercharger model is for the pressure and temperature after calculation engine supercharging;
Described air throttle model is determined throttle opening for the throttle orifice equation based on constant entropy adiabatic process;
Described EGR valve model is determined EGR valve opening for the throttle orifice equation based on constant entropy adiabatic process;
Described air inlet Component Model is for calculating the air ratio of air inlet.
Accordingly, described exhaust gas constituents model is specifically for the air ratio in calculating waste gas and the fuel oil ratio in waste gas.
Accordingly, described thermal balance model is for passing through Heat balance calculation water inflow of the engine temperature and leaving water temperature.
Accordingly, described kinematic train model comprises: Inertial Mode block models, clutch model, wheel box model and main reducing gear differential mechanism model;
Described longitudinal vehicle dynamic model comprises: car load load module and car load rate pattern;
Described accessory model comprises: starter motor model, battery model and air-conditioning model.
As can be seen here, the embodiment of the present invention has following beneficial effect:
The diesel oil that the embodiment of the present invention provides, the hardware-in-the-loop test system of natural gas double fuel engine controller, by building controller plant model, plant model comprises environmental model, pilot model and whole vehicle model, particularly the dual-fuel engine model in whole vehicle model (comprises gas circuit model, fuel supply model, cylinder combustion model, thermal balance model), can complete the emulation to dual-fuel engine, thereby realize diesel oil ignited, the closed loop test of natural gas straight fuel-injection engine controller, dynamic test, can simulate different operating mode scenes: start, sudden change load, engine rig test circulation, the static dynamic operation conditions such as car load driving cycle, to complete the control parameter of HPDI dual-fuel engine controller, demarcate in advance, functional test, durable test etc., there is safety, economical, low cost and other advantages.In addition, cylinder combustion model adopts the mode that Natural Gas Conversion is become to diesel oil, realizes effectively simple and is conducive to directly change on existing Diesel Engine Model, saves manpower, raises the efficiency.
Accompanying drawing explanation
The schematic diagram of the dual-fuel engine controller simulation test macro embodiment mono-that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of the dual-fuel engine controller simulation test macro embodiment bis-that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the schematic diagram of whole vehicle model embodiment in the embodiment of the present invention;
Fig. 4 is the schematic diagram of dual-fuel engine model embodiment in the embodiment of the present invention;
Fig. 5 is the schematic diagram of gas circuit model embodiment in the embodiment of the present invention;
Fig. 6 is the schematic diagram of fuel supply model embodiment in the embodiment of the present invention;
Fig. 7 is the schematic diagram of torque model embodiment in the embodiment of the present invention;
Fig. 8 is the principle of work schematic diagram of torque model embodiment in the embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the embodiment of the present invention is described in further detail.
For there is no the technical matters for the HIL test macro of high pressure direct injection dual-fuel engine ECU in prior art, the embodiment of the present invention provides a kind of emulation test system for dual-fuel engine controller, can realize dynamic closed loop test, limiting condition test, test automatically, repeatable test in HPDI Engine ECU performance history, there is safety, economy, low cost and other advantages.
Shown in Figure 1, be the dual-fuel engine controller simulation test macro embodiment mono-that the embodiment of the present invention provides, this system can comprise:
Real-time simulation machine 101 and engine controller 102.
Real-time simulation machine is for running environment model 1011, pilot model 1012 and whole vehicle model 1013.
Wherein, environmental model can simulating vehicle external environment condition, exports various vehicle environmental parameters, such as determine the vehicle environmental parameters such as height above sea level, road-adhesion coefficient, road grade, atmospheric pressure temperature, wind speed according to vehicle operating chainage.
Pilot model is mainly used in the realization of driving test cycle, according to the curve of the speed of a motor vehicle of driving cycle and time, carries out car load operation, and pilot model can carry out the switching of clutch operation, throttle action and gear automatically.Can be by the input speed of a motor vehicle, engine speed, car load resistance, engine output torque, wheel box input torque, clutch rotational speed etc., the driving behavior parameters such as output accelerator open degree, brake aperture, clutch coupling aperture, gear, starting switch, ignition switch, air-conditioning switch.
Real-time simulation machine is for sending to engine controller by each vehicle operating parameters of the driving behavior parameter of the vehicle environmental parameter of environmental model output, pilot model output and whole vehicle model output; And receive the control signal that engine controller sends, according to control signal, continue running environment model, pilot model and whole vehicle model.
Engine controller is that engine electronic control unit ECU generates control signal for determining engine operating condition according to vehicle environmental parameter, driving behavior parameter and vehicle operating parameters and carrying out steering logic, and control signal is sent to real-time simulation machine.
In actual applications, shown in Figure 2, the dual-fuel engine controller simulation test macro embodiment bis-that the embodiment of the present invention provides, real-time simulation machine and Engine ECU all can be connected with user's host computer, between real-time simulation machine and engine controller, by input and output IO board, be connected, in emulation test system, can also comprise load box.User's host computer can operational system configuration software, matched environment software (as MATLAB/Simulink etc.), experimental enviroment software during operation real-time simulation test, detect correlated variables, parameter in each model, after environmental model, pilot model and whole vehicle model compiling, generating code downloads in real-time simulation machine and moves.Real-time simulation machine running environment model, pilot model and whole vehicle model, the vehicle environmental parameter of environmental model being exported by IO board, each vehicle operating parameters of the driving behavior parameter of pilot model output and whole vehicle model output is converted to sensor physical signalling and sends to engine controller, engine controller operation needs input signal, by sensor signal (as engine speed, accelerator open degree, water temperature, rail pressure etc.) input, complete the execution of operating mode judgement and control decision, and then the corresponding driving of output signal is control signal, each model and/or load box that control signal is exported in real-time simulation machine by IO board are carried out, load box can be used for filling real load or fictitious load (load board), real-time simulation machine can upgrade environmental model according to control signal, the operation of pilot model and whole vehicle model, thereby realize the test to engine controller closed-loop control.
Shown in Figure 3, in some embodiments of the invention, above-mentioned whole vehicle model can comprise dual-fuel engine model 301, accessory model 302, kinematic train model 303, longitudinal direction of car dynamic model 304.
Kinematic train model can comprise: Inertial Mode block models, clutch model, wheel box model and main reducing gear differential mechanism model; Kinematic train model can be by input engine output torque, engine moment inertia, each wheel the output engine rotating speeds such as angular velocity, clutch rotational speed, wheel box input torque, each wheel torque etc.Longitudinal vehicle dynamic model can comprise: car load load module and car load rate pattern; Longitudinal direction of car dynamic model can be by the output speed of a motor vehicle, vehicle mileage, vehicle drag, each angular speeds of wheel such as moment of torsion, wind speed, brake aperture, environmental density, road grade of each wheel of input.Accessory model can comprise: starter motor model, battery model and air-conditioning model etc., can export igniting switching signal, starting switch signal, air-conditioning switch signal, engine speed, annex moment of torsion etc.
Shown in Figure 4, in some embodiments of the invention, above-mentioned dual-fuel engine model can comprise gas circuit model 401, fuel supply model 402, cylinder combustion model 403, thermal balance model 404; Fuel supply model 402 can be for calculating diesel oil rail pressure, rock gas rail pressure, diesel oil distributive value and natural gas injection amount.Cylinder combustion model 403 can comprise torque model 4031 and exhaust gas constituents model 4032, and torque model can be for the output torque of calculation engine, and exhaust gas constituents model can be for calculating exhaust gas constituents.
Dual-fuel engine model is the core that realizes dual-fuel engine controller simulation test, below respectively the gas circuit model in dual-fuel engine model, fuel supply model, cylinder combustion model and thermal balance model 404 is specifically described.
Shown in Figure 5, in some embodiments of the invention, gas circuit model can comprise: supercharger model 501, air throttle model 502, inlet manifold model 503, air inlet Component Model 504, exhaust manifold model 505 and EGR valve model 506.
Wherein, supercharger model is for the pressure and temperature after calculation engine supercharging, concrete, can carry out PT1 filtering by the MAP (being arteries and veins spectrogram) based on rotating speed and the total oil mass of diesel oil again, pressure and temperature after calculating supercharging, with the slow change procedure of simulating engine temperature, pressure.
Air throttle model is determined throttle opening for the throttle orifice equation based on constant entropy adiabatic process; EGR valve model is determined EGR valve opening for the throttle orifice equation based on constant entropy adiabatic process.Concrete, air throttle model and EGR valve model all can be based on following equation Modeling:
Wherein,
for the mass rate of the throttle orifice of flowing through (or EGR valve), unit is kg/s, and μ is coefficient of flow, and A (α) is stream function, and k is coefficient of heat insulation, P
ofor top hole pressure, P
ifor intake pressure, α is throttling valve angle, and R is gaseous state constant.
Inlet manifold model, exhaust manifold model can adopt " filling row's method " method to carry out zero dimension modeling, adopt mass-conservation equation, energy conservation equation and the equation of gas state." fill row's method " and be full of-exhaust method, be again volumetric method.Actual is that air inlet-outlet pipe is regarded as to a simple receptacle suitable with original piping volume, and unsettled flow process is reduced to metastable flowing to or outflow process.
Air inlet Component Model is for calculating the air ratio of air inlet.Specifically can calculate by following formula: inlet air ratio=(air throttle mass rate+waste gas air ratio * EGR mass rate)/(air throttle mass rate+EGR mass rate).
Shown in Figure 6, in some embodiments of the invention, fuel supply model can comprise:
Diesel injector model 601, diesel oil rail model 602, diesel oil high-pressure oil pump model 603, rock gas rail model 604 and gas injector model 605;
Wherein, diesel injection pulsewidth and the diesel oil rail pressure of diesel injector model for collecting according to IO interface hardware, calculates diesel oil distributive value and exports to diesel oil rail model.Specifically can adopt MAP mode to calculate diesel oil distributive value according to diesel injection pulsewidth and diesel oil rail pressure, fuel injector sprays diesel oil amount q=MAP (injection pulse width t, rail pressure p).
Diesel oil high-pressure oil pump model is used for adopting qualitative modeling calculate high-pressure oil pump pump oil mass and export to diesel oil rail model.Fuel delivery in each working cycle of high-pressure oil pump is a mean value, rather than the pulse fuel delivery of instantaneous cam shaft line driving.Circular is: fuel delivery q_Pump=Max_V*fac_Meun*eta; Maximum fuel delivery: Max_V=(rotating speed/60) the * oil cylinder of high-pressure oil pump volume; Fuel gauging unit controls factor fac_Meun: look into CUR by fuel gauging unit drives current i _ Meun and calculate, fac_Meun=CUR (i_Meun).
Diesel oil rail model, for according to diesel oil distributive value and high-pressure oil pump pump oil mass, calculates diesel oil rail pressure and exports to diesel injector model and rock gas rail model.Diesel oil rail model specifically for: according to continuity equation:
calculate diesel oil rail pressure P and export to diesel injector model and rock gas rail model; Wherein, Q
infor entering the diesel oil flow of diesel oil rail, according to high-pressure oil pump pump oil mass, obtain; Q
outfor flowing out the diesel oil flow of diesel oil rail, according to diesel oil distributive value Conversion of measurement unit, obtain; E is the elastic modulus of diesel oil; V is the volume of diesel oil rail.
Rock gas rail model is for obtaining rock gas rail pressure according to diesel oil rail pressure; Rock gas rail pressure can be calculated according to diesel oil rail pressure, and diesel oil rail pressure keeps constant poor substantially.
Gas injector model, for according to the natural gas injection pulsewidth and the rock gas rail pressure that collect, calculates natural gas injection amount.With diesel injector model class seemingly, gas injector model also can adopt MAP mode calculate natural gas injection amount according to natural gas injection pulsewidth and rock gas rail pressure.
Shown in Figure 7, in some embodiments of the invention, torque model can comprise:
Prompting moment of torsion obtains unit 701, for natural gas injection amount being converted to the equivalent diesel quality that produces same moment of torsion, according to equivalent diesel quality and diesel oil distributive value sum, obtains prompting moment of torsion.
Friction torque obtains unit 702, for search friction torque arteries and veins spectrogram according to engine water temperature, engine speed, obtains friction torque.
Moment of torsion obtains unit 703, for calculating prompting moment of torsion and friction torque sum as the output torque of engine.
In some embodiments of the invention, prompting moment of torsion acquisition unit can comprise:
First obtains subelement, for adopting, natural gas injection amount and the conversion coefficient mode being added with compensation rate that multiplies each other is again obtained to the equivalent diesel quality that natural gas injection amount is converted to the same moment of torsion of generation; Wherein, conversion coefficient is searched natural cyclostrophic diesel oil conversion coefficient arteries and veins spectrogram acquisition according to engine speed, gas pedal aperture; Compensation rate is searched natural cyclostrophic diesel oil compensation rate arteries and veins spectrogram according to engine speed, gas pedal aperture and is obtained.
Second obtains subelement, for searching prompting moment of torsion arteries and veins spectrogram acquisition prompting moment of torsion according to equivalent diesel quality and diesel oil distributive value sum, engine speed.
In some embodiments of the invention, prompting moment of torsion acquisition unit can also comprise:
Revise subelement, for search prompting torque correction factor arteries and veins spectrogram according to engine speed, injection advance angle, obtain prompting torque correction factor; The prompting moment of torsion that the second acquisition subelement is obtained multiplies each other as prompting moment of torsion with prompting torque correction factor.
Shown in Figure 8, the principle of work of torque model is: by natural gas injection amount being converted into the equivalent diesel quality that produces same moment of torsion, the diesel quality based on total (being equivalent diesel quality and diesel oil distributive value sum) calculates basic indication torque.Above-mentioned transfer process is that the linear mode by y=kx+b carries out, and wherein equivalent diesel quality, the x of y representative after changing represents that natural gas injection amount, k are that conversion coefficient, b are compensation rate.Converting system k calculates by looking into the mode of natural cyclostrophic diesel oil conversion coefficient MAP table, and natural cyclostrophic diesel oil conversion coefficient MAP input is respectively engine speed and gas pedal aperture.Compensation rate b calculates by looking into the mode of natural cyclostrophic diesel oil compensation rate MAP table, and the input of natural cyclostrophic diesel oil compensation rate MAP is respectively engine speed and gas pedal aperture.Basis indication torque is searched prompting moment of torsion MAP by engine speed, equivalent diesel quality and diesel oil distributive value sum and is obtained.Indication torque can also be revised by prompting torque correction factor MAP, prompting torque correction factor MAP input is respectively engine speed and injection advance angle, this injection advance angle refers to main jet angle of advance, main jet may be rock gas or diesel oil, so main jet angle of advance is natural gas injection angle of advance or diesel injection angle of advance.Friction torque is by engine water temperature, engine speed, to search friction torque MAP to calculate, and is negative value.The effective torque of final output is indication torque and friction torque sum.In addition, torque model also can be for calculating respectively indication torque according to natural gas injection amount and diesel oil distributive value, and then summation obtains prompting moment of torsion.
In some embodiments of the invention, exhaust gas constituents model can be specifically for the air ratio in calculating waste gas and the fuel oil ratio in waste gas.Can be by the air inlet composition of inputting in air inlet Component Model, the ratio of the not combustion in air-fuel ratio, fuel oil etc. completes calculating.Detailed process is: air ratio=f (air-fuel ratio AFR in waste gas, internal combustion oil of cylinder amount, air capacity in cylinder, gross mass after burning), wherein air-fuel ratio is parameter, air capacity=air inlet charge * inlet air ratio in cylinder, air inlet charge=f (theoretical air inflow, charging efficiency), theoretical air inflow=f (inlet manifold density, engine displacement, ratio of compression), charging efficiency is looked into MAP table according to rotating speed, inlet manifold and is calculated, inlet air ratio=f (air throttle mass rate, EGR air ratio, EGR mass rate).Total amount after amount of fuel/burning not in waste gas intermediate fuel oil ratio=waste gas; Amount of fuel=total amount of fuel * MAP (rotating speed, injection advance angle) not in waste gas.
In some embodiments of the invention, thermal balance model can be for passing through Heat balance calculation water inflow of the engine temperature and leaving water temperature.According to effective engine power, by computation of table lookup, go out engine heat loss, add the heat of EGR thermal loss, machine oil transmission feedwater etc., deduct the heat in inflow radiator and enter atmosphere heat, obtaining a heat flux, this heat flux is used for making engine outlet water temperature to heat up.Engine enters coolant-temperature gage, is to deduct according to the heat in heating radiator the heat that heating radiator enters atmosphere, and the heat flux obtaining heats up heating radiator leaving water temperature, i.e. water inflow of the engine temperature.
The embodiment of the present invention has built a kind of hardware-in-the-loop test system of diesel oil ignited high pressure direct injection natural gas engine.Plant model relates to lengthwise movement, the car load load environment of car load, and key component is engine fuel supply and combustion model.The dual-fuel combustion torque emulation of diesel oil, rock gas, adopts the mode of energy equivalence the tolerance of rock gas to be converted to the equivalent oil mass of diesel engine, obtains total diesel oil oil mass for calculating indication torque.It is y=kx+b that amount of natural gas is converted to the linear method that diesel oil amount adopts transformation ratio to add compensation rate, and transformation ratio k and compensation rate b look into MAP table by engine speed and gas pedal aperture and obtain.
Like this, the diesel oil that the embodiment of the present invention provides, the hardware-in-the-loop test system of natural gas double fuel engine controller, by building controller plant model, plant model comprises environmental model, pilot model and whole vehicle model, particularly the dual-fuel engine model in whole vehicle model (comprises gas circuit model, fuel supply model, cylinder combustion model, thermal balance model), can complete the emulation to dual-fuel engine, thereby realize diesel oil ignited, the closed loop test of natural gas straight fuel-injection engine controller, dynamic test, can simulate different operating mode scenes: start, sudden change load, engine rig test circulation, the static dynamic operation conditions such as car load driving cycle, to complete the control parameter of HPDI dual-fuel engine controller, demarcate in advance, functional test, durable test etc., there is safety, economical, low cost and other advantages.In addition, cylinder combustion model adopts the mode that Natural Gas Conversion is become to diesel oil, realizes effectively simple and is conducive to directly change on existing Diesel Engine Model, saves manpower, raises the efficiency.
It should be noted that, in this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed system of embodiment or device, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part partly illustrates referring to method.
Also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (11)
1. a dual-fuel engine controller simulation test macro, is characterized in that, described system comprises:
Real-time simulation machine and engine controller;
Described real-time simulation machine is for running environment model, pilot model and whole vehicle model, and described whole vehicle model comprises dual-fuel engine model, accessory model, kinematic train model, longitudinal direction of car dynamic model; Described dual-fuel engine model comprises gas circuit model, fuel supply model, cylinder combustion model, thermal balance model; Described fuel supply model is used for calculating diesel oil rail pressure, rock gas rail pressure, diesel oil distributive value and natural gas injection amount; Described cylinder combustion model comprises torque model and exhaust gas constituents model, and described torque model is for the output torque of calculation engine, and described exhaust gas constituents model is used for calculating exhaust gas constituents;
Described real-time simulation machine is for sending to described engine controller by each vehicle operating parameters of the driving behavior parameter of the vehicle environmental parameter of described environmental model output, the output of described pilot model and the output of described whole vehicle model; Receive the control signal that described engine controller sends, according to described control signal, continue running environment model, pilot model and whole vehicle model;
Described engine controller generates control signal for determining engine operating condition according to described vehicle environmental parameter, described driving behavior parameter and described vehicle operating parameters and carrying out steering logic, and described control signal is sent to described real-time simulation machine.
2. system according to claim 1, is characterized in that, described fuel supply model comprises:
Diesel injector model, diesel oil high-pressure oil pump model, diesel oil rail model, rock gas rail model and gas injector model;
Described diesel injector model, for according to the diesel injection pulsewidth and the diesel oil rail pressure that collect, calculates diesel oil distributive value and exports to described diesel oil rail model;
Described diesel oil high-pressure oil pump model is used for adopting qualitative modeling calculate high-pressure oil pump pump oil mass and export to described diesel oil rail model;
Described diesel oil rail model, for according to described diesel oil distributive value and described high-pressure oil pump pump oil mass, calculates diesel oil rail pressure and exports to described diesel injector model and described rock gas rail model;
Described rock gas rail model is for obtaining rock gas rail pressure according to described diesel oil rail pressure;
Described gas injector model, for according to the natural gas injection pulsewidth and the described rock gas rail pressure that collect, calculates natural gas injection amount.
3. system according to claim 2, is characterized in that, described diesel oil rail model specifically for:
According to continuity equation:
calculate diesel oil rail pressure P and export to described diesel injector model and described rock gas rail model; Wherein, Q
infor entering the diesel oil flow of diesel oil rail, according to described high-pressure oil pump pump oil mass, obtain; Q
outfor flowing out the diesel oil flow of diesel oil rail, according to described diesel oil distributive value Conversion of measurement unit, obtain; E is the elastic modulus of diesel oil; V is the volume of diesel oil rail.
4. system according to claim 1, is characterized in that, described torque model comprises:
Prompting moment of torsion obtains unit, for described natural gas injection amount being converted to the equivalent diesel quality that produces same moment of torsion, according to described equivalent diesel quality and described diesel oil distributive value sum, obtains prompting moment of torsion;
Friction torque obtains unit, for search friction torque arteries and veins spectrogram according to engine water temperature, engine speed, obtains friction torque;
Moment of torsion obtains unit, for calculating described prompting moment of torsion and described friction torque sum as the output torque of engine.
5. system according to claim 4, is characterized in that, described prompting moment of torsion obtains unit and comprises:
First obtains subelement, for adopting, described natural gas injection amount and the conversion coefficient mode being added with compensation rate that multiplies each other is again obtained to the equivalent diesel quality that described natural gas injection amount is converted to the same moment of torsion of generation;
Second obtains subelement, for searching prompting moment of torsion arteries and veins spectrogram acquisition prompting moment of torsion according to described equivalent diesel quality and described diesel oil distributive value sum, engine speed.
6. system according to claim 5, is characterized in that, described prompting moment of torsion obtains unit and also comprises:
Revise subelement, for search prompting torque correction factor arteries and veins spectrogram according to engine speed, injection advance angle, obtain prompting torque correction factor; The described second prompting moment of torsion and described prompting torque correction factor that obtains subelement acquisition multiplied each other as prompting moment of torsion.
7. system according to claim 5, is characterized in that, described conversion coefficient is searched natural cyclostrophic diesel oil conversion coefficient arteries and veins spectrogram according to engine speed, gas pedal aperture and obtained; Described compensation rate is searched natural cyclostrophic diesel oil compensation rate arteries and veins spectrogram according to engine speed, gas pedal aperture and is obtained.
8. system according to claim 1, is characterized in that, described gas circuit model comprises:
Supercharger model, air throttle model, inlet manifold model, air inlet Component Model, exhaust manifold model and EGR valve model;
Described supercharger model is for the pressure and temperature after calculation engine supercharging;
Described air throttle model is determined throttle opening for the throttle orifice equation based on constant entropy adiabatic process;
Described EGR valve model is determined EGR valve opening for the throttle orifice equation based on constant entropy adiabatic process;
Described air inlet Component Model is for calculating the air ratio of air inlet.
9. system according to claim 1, is characterized in that, described exhaust gas constituents model is specifically for the air ratio in calculating waste gas and the fuel oil ratio in waste gas.
10. system according to claim 1, is characterized in that, described thermal balance model is for passing through Heat balance calculation water inflow of the engine temperature and leaving water temperature.
11. systems according to claim 1, is characterized in that,
Described kinematic train model comprises: Inertial Mode block models, clutch model, wheel box model and main reducing gear differential mechanism model;
Described longitudinal vehicle dynamic model comprises: car load load module and car load rate pattern;
Described accessory model comprises: starter motor model, battery model and air-conditioning model.
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