CN103277204A - Method and device for high-pressure oil way model establishment - Google Patents
Method and device for high-pressure oil way model establishment Download PDFInfo
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- CN103277204A CN103277204A CN2013102100743A CN201310210074A CN103277204A CN 103277204 A CN103277204 A CN 103277204A CN 2013102100743 A CN2013102100743 A CN 2013102100743A CN 201310210074 A CN201310210074 A CN 201310210074A CN 103277204 A CN103277204 A CN 103277204A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 239000003921 oil Substances 0.000 claims description 357
- 238000002347 injection Methods 0.000 claims description 134
- 239000007924 injection Substances 0.000 claims description 134
- 239000000446 fuel Substances 0.000 claims description 101
- 239000000295 fuel oil Substances 0.000 claims description 33
- 230000010354 integration Effects 0.000 claims description 7
- 238000010587 phase diagram Methods 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 9
- 239000007921 spray Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract 4
- 238000011217 control strategy Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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Abstract
The invention provides a method and device for high-pressure oil way model establishment. Effective oil pressing time of a high-pressure oil pump in a unit working cycle and oil spraying time of an oil sprayer in the unit working cycle are calculated so that the oil inlet rate of inflow oil amount of a high-pressure oil rail in the effective oil pressing time and the oil outlet rate of outflow oil spraying amount in the oil spraying time can be determined. Time integral is conducted on an algebraic sum of the oil inlet rate and the oil outlet rate, the rail pressure of the high-pressure oil rail is achieved according to a result after the integral. The oil inlet rate is an average value in the effective oil pressing time, the oil outlet rate is an average value in the oil spraying time, and therefore, in the unit working cycle of an engine, the oil inlet rate and the oil outlet rate are not the average values any more, and the oil inlet rate and the oil outlet rate can reflect transient change of the rail pressure of the high-pressure oil rail when the high-pressure oil pump pumps oil and the oil sprayer sprays oil. Therefore, the obtained rail pressure of the high-pressure oil rail is more accurate, a more accurate high-pressure oil way model can be established, and test requirements of a complex strategy controller can be further satisfied.
Description
Technical field
The present invention relates to engine art, relate in particular to a kind of high-pressure oil passage modeling method and device.
Background technique
In engine operational cycle, the fuel flow of the fuel flow that high pressure oil pump pumps and oil sprayer ejection is not mean value with crank angle (or time) pulsation.Accordingly, the pressure in the high pressure oil rail can produce the transient state fluctuation at pump oil or the fuel-displaced moment.
At present, be when carrying out the modeling of high-pressure oil passage, to carry out certain simplification to the comparatively general modeling pattern of high-pressure oil passage: think that the pump oil flow of high pressure oil pump and the oil spout flow of oil sprayer are average in work cycle, namely fuel-displaced process the average processing of high pressure oil pump to the pump of high pressure oil rail oil process and oil sprayer from high pressure oil rail, transient performance is simplified to average behavior in the unit time.Therefore, the mass flowrate of inflow and outflow high pressure oil rail is constant in the random time of this modeling pattern acquiescence in the working unit circulation, and just there is not the transient state fluctuation in rail pressure yet.
Existing this high-pressure oil passage model can satisfy general hardware at ring (Hardware-In-the-Loop, abbreviation HIL) test of the relevant control strategy of system's middle controller, and along with the raising of motor and automobile emissions standards, the control strategy of controller becomes increasingly complex, therefore, need the model of more accurate high-pressure oil passage when test controller, the high-pressure oil passage model after the above-mentioned simplification can't satisfy the demands.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of high-pressure oil passage modeling method, and purpose is to solve the problem that high-pressure oil passage model that existing high-pressure oil passage modeling method obtains can't satisfy the requirement of complicated controller test.
To achieve these goals, the embodiment of the invention provides following technological scheme:
A kind of high-pressure oil passage modeling method comprises:
Calculating enters high pressure oil pump by the low pressure oil circuit in the working unit circulation amount of fuel;
According to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Calculating is in described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing;
Obtain the fuel injection quantity of oil sprayer in described working unit circulation;
Determine the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth;
The oil yielding rate of the fuel oil of described fuel injection quantity is flowed out in calculating by described high pressure oil rail in described injection time;
The algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, according to the rail pressure that the result behind the integration obtains described high pressure oil rail, to finish described high-pressure oil passage is carried out modeling.
Preferably, described calculating is comprised by the amount of fuel that the low pressure oil circuit enters high pressure oil pump in working unit circulation:
Number of cylinders, piston area, stroke, fuel oil Young's modulus and the current rail pressure of the oil pump control signal of sending according to the controller of described high-pressure oil passage and oil pump flow characteristic, oil pump are calculated the amount of fuel that enters high pressure oil pump by the low pressure oil circuit.
Preferably, the camshaft of the described high pressure oil pump of described foundation and the phase relationship of bent axle, determine that the oily time of the effective pressure of described high pressure oil pump in the circulation of described working unit comprises:
According to the phase diagram of engine crankshaft, camshaft and high pressure oil pump camshaft, obtain when described high pressure oil pump piston is compressed to top dead center in described working unit circulation with respect to bent axle first crank angle at zero point;
Gather motor in described working unit circulation during closed electromagnetic valve with respect to bent axle second crank angle at zero point;
According to described first crank angle, described second crank angle and engine speed, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation.
Preferably, the described fuel injection quantity of oil sprayer in described working unit circulation that obtain comprises:
According to the characteristic inquiry bivariate table of fuel injection pulsewidth, rail pressure and oil sprayer, obtain the every cylinder of motor total fuel injection quantity in the working unit circulation, as the fuel injection quantity of oil sprayer.
Preferably, describedly determine that according to injection advance angle and fuel injection pulsewidth the injection time of described oil sprayer in the circulation of described working unit comprises:
Injection advance angle is converted into first angle with respect to bent axle, the actual rotational angle of described bent axle is equaled the moment of described first angle as the initial moment of oil spout;
With finish time of duration of fuel injection pulsewidth as end of injection constantly;
With described end of injection constantly with the difference in the described initial moment of oil spout as the injection time of described oil sprayer in described working unit circulation.
A kind of high-pressure oil passage model building device comprises:
The amount of fuel computing module is used for calculating the amount of fuel that enters high pressure oil pump by the low pressure oil circuit in the working unit circulation;
Effectively press oil time determination module, be used for according to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Oil-feed rate computing module is used for calculating in described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing;
The fuel injection quantity acquisition module is used for obtaining the fuel injection quantity of oil sprayer in described working unit circulation;
The injection time determination module is used for determining the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth;
The oil yielding rate computing module is used for calculating the oil yielding rate that is flowed out the fuel oil of described fuel injection quantity in described injection time by described high pressure oil rail;
The rail pressure computing module is used for the algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, according to the rail pressure that the result behind the integration obtains described high pressure oil rail, to finish described high-pressure oil passage is carried out modeling.
Preferably, described amount of fuel computing module comprises:
The amount of fuel computing unit, be used for number of cylinders, piston area, stroke, fuel oil Young's modulus and the current rail pressure of oil pump control signal that the controller according to described high-pressure oil passage sends and oil pump flow characteristic, oil pump, calculate the amount of fuel that enters high pressure oil pump by the low pressure oil circuit.
Preferably, described effective pressure oil time determination module comprises:
The first crank angle acquiring unit, be used for the phase diagram according to engine crankshaft, camshaft and high pressure oil pump camshaft, obtain when described high pressure oil pump piston is compressed to top dead center in described working unit circulation with respect to bent axle first crank angle at zero point;
The second crank angle collecting unit, be used for to gather motor in described working unit circulation during closed electromagnetic valve with respect to bent axle second crank angle at zero point;
Effectively press oil time determining unit, be used for according to described first crank angle, described second crank angle and engine speed, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation.
Preferably, described fuel injection quantity acquisition module comprises:
The fuel injection quantity acquiring unit is used for the characteristic inquiry bivariate table according to fuel injection pulsewidth, rail pressure and oil sprayer, obtains the every cylinder of motor total fuel injection quantity in the working unit circulation, as the fuel injection quantity of oil sprayer.
Preferably, described injection time determination module comprises:
Initial moment determining unit is used for injection advance angle is converted into first angle with respect to bent axle, and the actual rotational angle of described bent axle is equaled the moment of described first angle as the initial moment of oil spout;
The finish time determining unit, be used for finish time of duration of fuel injection pulsewidth as end of injection constantly;
The injection time computing unit is used for described end of injection constantly with the difference in the described initial moment of oil spout as the injection time of described oil sprayer in described working unit circulation.The described high-pressure oil passage modeling method of the embodiment of the invention and device, by calculating effective press oil time and oil sprayer the injection time described working unit circulation in of high pressure oil pump in described working unit circulation, determine that described high pressure oil rail is in described effective oil-feed rate that flows into amount of fuel in the oil time of pressing, and the oil yielding rate that in described injection time, flows out fuel injection quantity, and the algebraic sum of described oil-feed rate and described oil yielding rate carried out time integral, obtain the rail pressure of described high pressure oil rail according to the result behind the integration, because the oil-feed rate is the mean value of effectively pressing in the oil time, oil yielding rate is the mean value in the injection time, therefore, in the working unit circulation, oil-feed rate and oil yielding rate all no longer are mean value, and the transient changing of the rail pressure of high pressure oil rail can embody high pressure oil pump pump oil and oil sprayer oil spout the time, therefore, the rail pressure of the high pressure oil rail that obtains is more accurate, thereby can set up more accurate high-pressure oil passage model, further satisfies the testing requirement of sophisticated strategies controller.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the disclosed a kind of high-pressure oil passage modeling method of the embodiment of the invention;
Fig. 2 is the flow chart of disclosed another the high-pressure oil passage modeling method of the embodiment of the invention;
Fig. 3 is the structural representation of the disclosed a kind of high-pressure oil passage model building device of the embodiment of the invention;
Fig. 4 is the structural representation of disclosed another the high-pressure oil passage model building device of the embodiment of the invention.
Embodiment
The embodiment of the invention discloses a kind of high-pressure oil passage modeling method, its core inventive point is, in the working unit circulation of high-pressure oil passage, determine effective injection time of pressing oil time and oil sprayer of high pressure oil pump, thereby obtain effectively pressing oil-feed rate in the oil time and the oil yielding rate in the injection time, and then determine rail pressure according to oil-feed rate and oil yielding rate, because oil-feed rate and oil yielding rate no longer the are working units interior mean value that circulates, therefore, can simulate the transient state fluctuation of rail pressure.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment who obtains under the creative work prerequisite.
The disclosed a kind of high-pressure oil passage modeling method of the embodiment of the invention as shown in Figure 1, comprising:
S101: calculate the amount of fuel that in the working unit circulation, enters high pressure oil pump by the low pressure oil circuit;
S102: according to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Usually, the running of high pressure oil pump piston from the lower dead center to the top dead center is called the pressure oil stroke of high pressure oil pump, in this course, have only when the oil pressure in the plunger cavity is compressed to greater than the oil pressure in the high pressure oil rail, one-way valve between high-pressure service pump and the oily rail just can be opened under the effect of pressure reduction, fuel oil just can flow into oily rail from high pressure oil pump, be opened to piston from one-way valve and run to time between the compression top center, can be defined as effective pressure oil time, press oily stroke At All Other Times, can be defined as non-effective pressure oil time.
S103: calculate in described effective oil-feed rate of pressing fuel oil in the oil time to be pressed into described high pressure oil rail;
As mentioned above, fuel oil is effectively pressing the oil time to be pressed into high pressure oil rail, and therefore, in the present embodiment, high pressure oil pump can be regarded following process as to the process that high pressure oil rail is pressed into fuel oil:
Effectively pressing in the oil time, all fuel oil is pressed into high pressure oil rail, and in non-effective pressure in the oil time, there is not fuel oil to be pressed into high pressure oil rail, namely for each oil pump clutch release slave cylinder, total fuel injection quantity on average is pressed into described high pressure oil rail corresponding effectively the pressure in the oil time within the work cycle, and the fuel flow that enters high pressure oil rail in the oil time in non-effective pressure is zero.
Amount of fuel divided by effectively pressing the oil time, is described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing.
S104: obtain the fuel injection quantity of oil sprayer in described working unit circulation;
S105: determine the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth;
When described injection advance angle was the oil sprayer commencement of fuel injection, the crank angle of plunger distance compression top center was called injection advance angle.
Described fuel injection pulsewidth is the time span of the each oil spout of Engine ECU control oil sprayer.
S106: calculate the oil yielding rate that in described injection time, is flowed out the fuel oil of described fuel injection quantity by described high pressure oil rail;
Similarly, in the present embodiment, the process of oil spout is regarded as: fuel injection quantity sprays according to fixing injection rate in corresponding injection time, and in the non-injection time within a work cycle, the injection rate of oil sprayer is zero.
S107: the algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, calculate the rail pressure of described high pressure oil rail, to finish described high-pressure oil passage is carried out modeling; That is, obtain namely finishing modeling process after the rail pressure of high pressure oil rail.
Wherein, the rail pressure that further calculates described high pressure oil rail according to the result behind the integration can be used existing computational methods, repeats no more here.
Particularly, after obtaining integral result, can obtain rail pressure in conjunction with fuel oil elastic model and oily rail volume calculations.
Need to prove that the time interval of the described time integral of present embodiment is the time of model running.
The described high-pressure oil passage modeling method of present embodiment, determine rail pressure by oil-feed rate and oil yielding rate, therefore, compare with existing method, the rail pressure that obtains can embody the transient state waveguide of actual rail pressure, therefore, the model of Jian Liing is more accurate thus, thereby can satisfy the testing requirement of the controller of sophisticated strategies.
Disclosed another the high-pressure oil passage modeling method of the embodiment of the invention is applied to following scene:
Comprise high pressure oil pump, the high pressure oil rail that links to each other with high pressure oil pump in the high-pressure oil passage, the oil sprayer that links to each other with high pressure oil rail, the fuel oil that flows into from the low pressure oil system at first enters high pressure oil pump, be pumped to high pressure oil rail by high pressure oil pump then, finally by the unlatching of fuel injector magnetic system, spray into cylinder through fuel injector magnetic system.During engine operation, when the pressure in the high-pressure service pump plunger during greater than the pressure in the high pressure oil rail chamber, fuel oil in the high pressure oil pump namely is pressed in the high pressure oil rail, when the fuel oil in the high pressure oil rail is opened at the solenoid valve of oil sprayer, sprays in the cylinder through oil sprayer and to burn.
As shown in Figure 2, described method comprises:
S201: according to the parameter of described high-pressure oil passage: the number of cylinders of the oil pump control signal that controller sends and oil pump flow characteristic, oil pump, piston area, stroke, fuel oil Young's modulus and current rail pressure, calculate the amount of fuel that enters high pressure oil pump by the low pressure oil circuit;
S202: according to the phase diagram of engine crankshaft, camshaft and high pressure oil pump camshaft, obtain when described high pressure oil pump piston is compressed to top dead center in described working unit circulation with respect to bent axle first crank angle at zero point;
S203: gather motor in described working unit circulation the closed electromagnetic valve moment with respect to bent axle second crank angle at zero point;
In the present embodiment, second crank angle can be represented the close moment of high pressure oil pump solenoid valve, and the close moment of high pressure oil pump solenoid valve (this signal is controlled by ECU, during closed electromagnetic valve, fuel oil in the cylinder begins compressed) can regard the simplification in the moment that one-way valve is opened as, that is to say that the close moment of the solenoid valve of high pressure oil pump can represent the moment of one-way valve opens, this simplifies the deviation of calculating generation, can carry out the coefficient correction with actual rail pressure.
In the present embodiment, when can the hardware integrated circuit board by the HIL system gathering in the circulation of motor working unit closed electromagnetic valve with respect to bent axle second crankshaft angles at zero point.
S204: according to described first crank angle, described second crank angle and engine speed, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Wherein, according to first crank angle, described second crank angle and engine speed, calculate and effectively press the formula of oil time as follows:
Effectively press oil time [s]=(second crank angle [rad]-first crank angle [rad])/engine speed [rad/s].
S205: calculate described amount of fuel divided by the result who effectively presses the oil time, obtain in described effective oil-feed rate of pressing in the oil time inner high voltage oil rail;
S206: according to the characteristic bivariate table of fuel injection pulsewidth, rail pressure and oil sprayer, obtain the every cylinder of motor total fuel injection quantity in the working unit circulation, as the fuel injection quantity of oil sprayer;
S207: injection advance angle is converted into first angle with respect to bent axle, the actual rotational angle of described bent axle is equaled the moment of described first angle as the initial moment of oil spout;
S208: with finish time of duration of fuel injection pulsewidth as end of injection constantly;
S209: with described end of injection constantly with the difference in the described initial moment of oil spout as the injection time of described oil sprayer in described working unit circulation;
S210: calculate described fuel injection quantity divided by the result of described injection time, obtain in described injection time, to be flowed out by described high pressure oil rail the oil yielding rate of the fuel oil of described fuel injection quantity;
S211: the algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, further calculate the rail pressure of described high pressure oil rail, so that described high-pressure oil passage is carried out modeling.
The described high-pressure oil passage modeling method of present embodiment, oil pump control signal and the oil pump flow characteristic sent according to the controller of described high-pressure oil passage, the number of cylinders of oil pump, piston area, stroke, fuel oil Young's modulus and current rail pressure, calculating is entered the amount of fuel of high pressure oil pump by the low pressure oil circuit, according to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation, determine the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth, it is and uses the existing parameter of high-pressure oil passage to calculate, therefore, exploitativeness is higher, use the model of the high-pressure oil passage of described method foundation can simulate the transient state fluctuation that rail pressure causes with high pressure oil pump pump oil and oil sprayer oil spout, the real work process that more accurately reflects engine oil path is conducive to the test of the relevant control strategy of HIL system middle controller.
Embodiment is corresponding with said method, the embodiment of the invention also discloses a kind of high-pressure oil passage model building device, as shown in Figure 3, comprising:
Amount of fuel computing module 301 is used for calculating the amount of fuel that enters high pressure oil pump by the low pressure oil circuit in the working unit circulation;
Effectively press oil time determination module 302, be used for according to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Oil-feed rate computing module 303 is used for calculating in described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing;
Fuel injection quantity acquisition module 304 is used for obtaining the fuel injection quantity of oil sprayer in described working unit circulation;
Injection time determination module 305 is used for determining the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth;
Oil yielding rate computing module 306 is used for calculating the oil yielding rate that is flowed out the fuel oil of described fuel injection quantity in described injection time by described high pressure oil rail;
Rail pressure computing module 307 is used for the algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, further calculates the rail pressure of described high pressure oil rail according to the result behind the integration, so that described high-pressure oil passage is carried out modeling.
The concrete workflow of the described device of present embodiment repeats no more as described in Figure 1 here.
The described high-pressure oil passage modeling method of present embodiment, determine rail pressure by effective oil-feed rate in the oil time of pressing with the oil yielding rate in effective injection time, therefore, compare with existing method, the rail pressure that obtains can embody the transient state waveguide of actual rail pressure, therefore, the model of Jian Liing is more accurate thus, thereby can satisfy the testing requirement of the controller of sophisticated strategies.
Disclosed another the high-pressure oil passage model building device of the embodiment of the invention as shown in Figure 4, comprising:
Amount of fuel computing unit 401, be used for number of cylinders, piston area, stroke, fuel oil Young's modulus and the current rail pressure of oil pump control signal that the controller according to described high-pressure oil passage sends and oil pump flow characteristic, oil pump, calculate the amount of fuel that enters high pressure oil pump by the low pressure oil circuit;
The first crank angle acquiring unit 402, be used for the phase diagram according to engine crankshaft, camshaft and high pressure oil pump camshaft, obtain when described high pressure oil pump piston is compressed to top dead center in described working unit circulation with respect to bent axle first crank angle at zero point;
The second crank angle collecting unit 403, be used for to gather motor in described working unit circulation during closed electromagnetic valve with respect to bent axle second crank angle at zero point;
Effectively press oil time determining unit 404, be used for according to described first crank angle, described second crank angle and engine speed, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Oil-feed rate computing module 405 is used for calculating in described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing;
Fuel injection quantity acquiring unit 406 is used for the characteristic inquiry bivariate table according to fuel injection pulsewidth, rail pressure and oil sprayer, obtains the every cylinder of motor total fuel injection quantity in the working unit circulation, as the fuel injection quantity of oil sprayer.
Initial moment determining unit 407 is used for injection advance angle is converted into first angle with respect to bent axle, and the actual rotational angle of described bent axle is equaled the moment of described first angle as the initial moment of oil spout;
The finish time, determining unit 408, be used for finish time of duration of fuel injection pulsewidth as end of injection constantly;
Injection time computing unit 409 is used for described end of injection constantly with the difference in the described initial moment of oil spout as the injection time of described oil sprayer in described working unit circulation;
Oil yielding rate computing module 410 is used for calculating the oil yielding rate that is flowed out the fuel oil of described fuel injection quantity in described injection time by described high pressure oil rail;
Rail pressure computing module 411 is used for the algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, further calculates the rail pressure of described high pressure oil rail;
The concrete workflow that the described device of present embodiment carries out modeling repeats no more as shown in Figure 2 here.
The model of the high-pressure oil passage that the described high-pressure oil passage model building device of present embodiment is set up can simulate the transient state fluctuation that rail pressure causes with high pressure oil pump pump oil and oil sprayer oil spout, the real work process that more accurately reflects engine oil path is conducive to the test of the relevant control strategy of HIL system middle controller.
If the described function of present embodiment method realizes with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the calculating equipment read/write memory medium.Based on such understanding, the part that the embodiment of the invention contributes to prior art or the part of this technological scheme can embody with the form of software product, this software product is stored in the storage medium, comprise that some instructions are with so that a calculating equipment (can be personal computer, server, mobile computing device or the network equipment etc.) carry out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, ROM (read-only memory) (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and other embodiment's difference that same or similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make related domain professional and technical personnel can realize or use the present invention.Multiple modification to these embodiments will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments herein.Therefore, the present invention will can not be restricted to these embodiments shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a high-pressure oil passage modeling method is characterized in that, comprising:
Calculating enters high pressure oil pump by the low pressure oil circuit in the working unit circulation amount of fuel;
According to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Calculating is in described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing;
Obtain the fuel injection quantity of oil sprayer in described working unit circulation;
Determine the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth;
The oil yielding rate of the fuel oil of described fuel injection quantity is flowed out in calculating by described high pressure oil rail in described injection time;
The algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, according to the rail pressure that the result behind the integration obtains described high pressure oil rail, to finish described high-pressure oil passage is carried out modeling.
2. method according to claim 1 is characterized in that, described calculating is comprised by the amount of fuel that the low pressure oil circuit enters high pressure oil pump in working unit circulation:
Number of cylinders, piston area, stroke, fuel oil Young's modulus and the current rail pressure of the oil pump control signal of sending according to the controller of described high-pressure oil passage and oil pump flow characteristic, oil pump are calculated the amount of fuel that enters high pressure oil pump by the low pressure oil circuit.
3. method according to claim 1 and 2 is characterized in that, the camshaft of the described high pressure oil pump of described foundation and the phase relationship of bent axle determine that the oily time of the effective pressure of described high pressure oil pump in the circulation of described working unit comprises:
According to the phase diagram of engine crankshaft, camshaft and high pressure oil pump camshaft, obtain when described high pressure oil pump piston is compressed to top dead center in described working unit circulation with respect to bent axle first crank angle at zero point;
Gather motor in described working unit circulation during closed electromagnetic valve with respect to bent axle second crank angle at zero point;
According to described first crank angle, described second crank angle and engine speed, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation.
4. method according to claim 1 is characterized in that, the described fuel injection quantity of oil sprayer in described working unit circulation that obtain comprises:
According to the characteristic inquiry bivariate table of fuel injection pulsewidth, rail pressure and oil sprayer, obtain the every cylinder of motor total fuel injection quantity in the working unit circulation, as the fuel injection quantity of oil sprayer.
5. according to claim 1 or 4 described methods, it is characterized in that, describedly determine that according to injection advance angle and fuel injection pulsewidth the injection time of described oil sprayer in the circulation of described working unit comprises:
Injection advance angle is converted into first angle with respect to bent axle, the actual rotational angle of described bent axle is equaled the moment of described first angle as the initial moment of oil spout;
With finish time of duration of fuel injection pulsewidth as end of injection constantly;
With described end of injection constantly with the difference in the described initial moment of oil spout as the injection time of described oil sprayer in described working unit circulation.
6. a high-pressure oil passage model building device is characterized in that, comprising:
The amount of fuel computing module is used for calculating the amount of fuel that enters high pressure oil pump by the low pressure oil circuit in the working unit circulation;
Effectively press oil time determination module, be used for according to the camshaft of described high pressure oil pump and the phase relationship of bent axle, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation;
Oil-feed rate computing module is used for calculating in described effective oil-feed rate that flows into the fuel oil of described amount of fuel in the oil time to described high pressure oil rail of pressing;
The fuel injection quantity acquisition module is used for obtaining the fuel injection quantity of oil sprayer in described working unit circulation;
The injection time determination module is used for determining the injection time of described oil sprayer in described working unit circulation according to injection advance angle and fuel injection pulsewidth;
The oil yielding rate computing module is used for calculating the oil yielding rate that is flowed out the fuel oil of described fuel injection quantity in described injection time by described high pressure oil rail;
The rail pressure computing module is used for the algebraic sum of described oil-feed rate and described oil yielding rate is carried out time integral, according to the rail pressure that the result behind the integration obtains described high pressure oil rail, to finish described high-pressure oil passage is carried out modeling.
7. device according to claim 6 is characterized in that, described amount of fuel computing module comprises:
The amount of fuel computing unit, be used for number of cylinders, piston area, stroke, fuel oil Young's modulus and the current rail pressure of oil pump control signal that the controller according to described high-pressure oil passage sends and oil pump flow characteristic, oil pump, calculate the amount of fuel that enters high pressure oil pump by the low pressure oil circuit.
8. according to claim 6 or 7 described devices, it is characterized in that described effective pressure oil time determination module comprises:
The first crank angle acquiring unit, be used for the phase diagram according to engine crankshaft, camshaft and high pressure oil pump camshaft, obtain when described high pressure oil pump piston is compressed to top dead center in described working unit circulation with respect to bent axle first crank angle at zero point;
The second crank angle collecting unit, be used for to gather motor in described working unit circulation during closed electromagnetic valve with respect to bent axle second crank angle at zero point;
Effectively press oil time determining unit, be used for according to described first crank angle, described second crank angle and engine speed, determine the effective pressure oil time of described high pressure oil pump in described working unit circulation.
9. device according to claim 6 is characterized in that, described fuel injection quantity acquisition module comprises:
The fuel injection quantity acquiring unit is used for the characteristic inquiry bivariate table according to fuel injection pulsewidth, rail pressure and oil sprayer, obtains the every cylinder of motor total fuel injection quantity in the working unit circulation, as the fuel injection quantity of oil sprayer.
10. according to claim 6 or 9 described devices, it is characterized in that described injection time determination module comprises:
Initial moment determining unit is used for injection advance angle is converted into first angle with respect to bent axle, and the actual rotational angle of described bent axle is equaled the moment of described first angle as the initial moment of oil spout;
The finish time determining unit, be used for finish time of duration of fuel injection pulsewidth as end of injection constantly;
The injection time computing unit is used for described end of injection constantly with the difference in the described initial moment of oil spout as the injection time of described oil sprayer in described working unit circulation.
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| CN111143980B (en) * | 2019-12-17 | 2022-03-22 | 淮阴工学院 | Method for calculating opening of check valve of high-pressure oil pipe |
| CN112855375A (en) * | 2021-02-18 | 2021-05-28 | 中国第一汽车股份有限公司 | Control method and device of oil injector, electronic equipment and storage medium |
| CN112855375B (en) * | 2021-02-18 | 2022-05-24 | 中国第一汽车股份有限公司 | Control method and device of oil injector, electronic equipment and storage medium |
| CN114033570A (en) * | 2021-11-26 | 2022-02-11 | 重庆红江机械有限责任公司 | Common rail diesel engine rail pressure control method and system, common rail diesel engine and storage medium |
| CN114033570B (en) * | 2021-11-26 | 2024-04-09 | 重庆红江机械有限责任公司 | Rail pressure control method and system for common rail diesel engine, common rail diesel engine and storage medium |
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