CN115510640A - Design method of special extended-range engine lubricating system - Google Patents
Design method of special extended-range engine lubricating system Download PDFInfo
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Abstract
The invention discloses a design method of a lubricating system of an extended-range special engine, which comprises the following steps: s01: one-dimensional engine performance simulation; s02: screening the working conditions of the engine; s03: compiling a control strategy; s04: judging whether the one-dimensional whole vehicle performance simulation is met; s05: eliminating and calculating the working conditions before system design; s06; designing a lubricating system model framework; s07: building a one-dimensional lubricating system model; s08: one-dimensional lubricating system simulation and oil pump performance simulation and calculation; s09: checking whether the optimized requirement of the lubricating system is met; s10: and finishing the design. The design method effectively simplifies the design steps, saves a large amount of data calculation and processing time and corresponding calculation resource occupancy, effectively simplifies the system structure, and reduces the manufacturing cost on the basis of improving the product quality.
Description
Technical Field
The invention relates to the technical field of engine lubrication systems, in particular to a design method of a special extended-range engine lubrication system.
Background
In the hybrid power mode of the extended range type, the power requirement on the engine is far lower than that of the traditional engine, the fuel economy is emphasized, and the extended range type engine needs to be provided with a lubricating system during design so as to ensure the normal and safe operation of the engine and avoid the fault phenomenon.
The design of each subsystem of the existing extended range engine except a combustion system also continues to use the design method of the traditional engine, for example, the design of a lubricating system needs to carry out matching calculation of all working conditions according to the characteristics of the engine, and the design also needs to meet the all working conditions of the engine, so the calculation and experiment amount of the engine are large, the development period is long, and the cost is high.
Disclosure of Invention
The invention aims to provide a design method of a lubricating system of a special extended-range engine, which simplifies the system structure, and reduces the manufacturing cost on the basis of improving the product quality.
In order to achieve the above purpose, the invention provides the following technical scheme: a design method of a lubricating system of an extended-range special engine comprises the following steps:
s01: one-dimensional engine performance simulation;
s02: screening the working conditions of the engine;
s03: compiling a control strategy;
s04: judging whether the one-dimensional whole vehicle performance simulation is met;
s05: eliminating and calculating the working conditions before system design;
s06; designing a lubricating system model framework;
s07: building a one-dimensional lubricating system model;
s08: one-dimensional lubricating system simulation and oil pump performance simulation and calculation;
s09: checking whether the optimized requirement of the lubricating system is met;
s10: and (5) finishing the design.
As a further description of the above technical solution:
in the step S01, a GT-POWER software is adopted to build a one-dimensional performance simulation model of the extended-range special engine, parameters of the cylinder diameter and the stroke boundary of the engine are given in the one-dimensional performance simulation model, an engine performance simulation result is obtained, and an engine characteristic curve is generated and comprises an engine rotating speed, a torque, an equal POWER line and an equal oil consumption rate line.
As a further description of the above technical solution:
in step S02, the step of screening the engine operating conditions is as follows:
s02.1: according to a drawn-up finished automobile performance target value and in combination with an actual driving road condition, dividing the requirements of a finished automobile power module on an engine into three working conditions of low-speed cruising, normal driving and high-speed driving;
s02.2: the method is characterized in that the engine working conditions are screened by combining three working conditions of the whole vehicle, namely a low-speed cruising working condition, a normal driving working condition and a high-speed driving working condition, and one starting idling working condition is selected.
As a further description of the above technical solution:
in the step S04, if the one-dimensional performance of the whole vehicle meets the development target, executing the step S05; and if the one-dimensional performance of the whole vehicle does not meet the development target, screening the working conditions of the engine again according to the power or oil consumption requirement, and repeatedly executing the step S03 and the step S04 to finally finish the selection of the working conditions of the engine.
As a further description of the above technical solution:
in the step S05, according to the one-dimensional simulation data result of the engine, the heat of the engine is calculated by combining the selected point of the maximum power of the working condition, the theoretical flow of the lubricating system is calculated by engine oil heat dissipation, the basic parameters of the lubricating system are preliminarily designed, the heat dissipation of other working conditions is calculated according to the parameters, whether the heat dissipation is met or not is judged, and if the heat dissipation is met, the working condition is rejected in the subsequent design simulation and optimization process
As a further description of the above technical solution:
in step S06, a lubricating oil path of the engine and a flow direction indication of the lubricating oil path are designed, and at the same time, the basic dimensions of each oil path, such as the diameter of the oil path and the clearance parameters, are determined according to the input parameters of the conceptual design and the remaining working conditions after the elimination.
As a further description of the above technical solution:
in the step S07, a one-dimensional lubricating system model is built according to the preliminary parameters of the oil pump, the one-dimensional lubricating system model includes all lubricating parts of the whole machine, lubricating oil passages of the whole machine and the like, and model boundaries such as theoretical discharge capacity of the oil pump, diameters of the oil passages, gaps and the like are set through calculation.
As a further description of the above technical solution:
in step S08, the method includes performing an incomming Steady State calculation in a one-dimensional Steady State, calculating distribution of oil pressure and flow rate in the lubrication system by considering only flow of oil, and calculating performance parameters such as a P (pressure) -Q (flow rate) characteristic curve, an n (rotation rate) -Q (flow rate) curve, and the like at each rotation speed of the oil pump according to basic parameters of the oil pump.
As a further description of the above technical solution:
in step S09, the data is collated according to the obtained pressure and flow data of each kinematic pair lubricating oil path, and the data is expressed by a formula,
preliminarily calculate the relative movement velocity V of each kinematic pair i Wherein D is i For each kinematic pair diameter, n is the kinematic pair rotation speed, and the minimum lubrication pressure of each kinematic pair can be further calculated
Comparing the data obtained by simulation, and checking whether the data meets the lubrication requirement.
As a further description of the above technical solution:
in the step S09, if the check satisfies the lubrication requirement, the step S10 is executed, and if the check does not satisfy the lubrication requirement, the step S08 is executed again.
In the above technical solution, the design method of the engine lubrication system dedicated for extended range provided by the present invention has the following beneficial effects:
the design method effectively simplifies the design steps, saves a large amount of data calculation and processing time and corresponding calculation resource occupancy, effectively simplifies the system structure, and reduces the manufacturing cost on the basis of improving the product quality.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of a method for designing a lubrication system of an extended range dedicated engine according to an embodiment of the present invention;
FIG. 2 is a schematic representation of a universal characteristic of an engine provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a P-Q characteristic curve of an oil pump under all operating conditions according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, a method for designing a lubrication system of an extended-range dedicated engine includes the following steps:
s01: simulating the performance of the one-dimensional engine;
s02: screening the working conditions of the engine;
s03: compiling a control strategy;
s04: judging whether the one-dimensional whole vehicle performance simulation is met;
s05: eliminating and calculating the working conditions before system design;
s06; designing a lubricating system model framework;
s07: building a one-dimensional lubricating system model;
s08: one-dimensional lubricating system simulation and oil pump performance simulation and calculation;
s09: checking whether the optimized requirement of the lubricating system is met;
s10: and finishing the design.
The design method effectively simplifies the design steps, saves a large amount of data calculation and processing time and corresponding calculation resource occupancy, effectively simplifies the system structure, and reduces the manufacturing cost on the basis of improving the product quality.
In the step S01, a one-dimensional performance simulation model of the extended range special engine is built by adopting GT-POWER software, cylinder diameter and stroke boundary parameters of the engine are given in the one-dimensional performance simulation model, an engine performance simulation result is obtained, and an engine characteristic curve is generated, wherein the engine characteristic curve comprises engine rotation speed, torque, equal POWER lines and equal oil consumption rate lines, for example, in the universal characteristic curve shown in fig. 2, the abscissa of the engine characteristic curve is engine rotation speed, the ordinate of the engine characteristic curve is torque, and the internal curve of the engine characteristic curve is an equal POWER line and an equal oil consumption rate line which are concerned in POWER matching.
In step S02, the steps of screening the engine operating conditions are as follows:
s02.1: dividing the requirements of a power module of the whole vehicle on an engine into three working conditions of low-speed cruising, normal running and high-speed running according to the drawn-up target value of the performance of the whole vehicle and the actual running road condition; the parking, rapid acceleration or rapid deceleration, climbing and other conditions of the whole vehicle are finished by the battery and the motor set, the actual operation working condition of the engine is not directly related to the operation working condition of the whole vehicle, and the three working conditions can be equivalently classified;
s02.2: the method comprises the following steps of screening engine working conditions into three driving working conditions of low-speed cruising, normal driving and high-speed driving by combining three working conditions of a whole vehicle, wherein one working condition is a starting idling working condition; the battery power consumption corresponding to the low-speed cruising working condition is small, the low-power of the engine is supplemented, the working condition of the engine is comprehensively selected to be the working condition with lower rotating speed in consideration of fuel economy and NVH performance by combining the universal characteristic curve, the working condition of the engine is comprehensively selected to be the working condition with moderate rotating speed in consideration of the fuel economy, the NVH performance and the power by combining the universal characteristic curve, the engine is driven at high speed and rapidly discharged by the battery, the corresponding battery power consumption is large, and the working condition of the engine is comprehensively selected to be the working condition with higher rotating speed and higher power in consideration of the fuel economy and the generated power by combining the universal characteristic curve.
Based on the SOC value of the battery and the torque requirement of the motor, the controller judges and selects working conditions, so that the engine is controlled to operate under any one of the working conditions of low-speed cruising, normal running and high-speed running.
In step S04, if the one-dimensional performance of the whole vehicle meets the development target, executing step S05; if the one-dimensional performance of the whole vehicle does not meet the development target, screening the working conditions of the engine again according to the power or oil consumption requirement, and repeatedly executing the step S03 and the step S04 to finally complete the selection of the working conditions of the engine;
it should be noted that the overall parameters related to the performance are mainly reflected on the performance of the motor, and the boundary parameters of the motor can be changed rapidly to adjust in the design process, and the invention mainly aims to screen out the proper working condition of the engine, so that the power and the acceleration performance of the whole vehicle are not taken as main factors to be referred, and the fuel economy, the cruising mileage and the like are mainly considered;
the working condition screening of the engine is selected based on the acquired universal characteristic curve and a design target, and the actual selection method comprises the following steps:
1: calculating the charging power of the engine under each working condition by calculating the power consumption rate = the engine power multiplied by the generator efficiency multiplied by the total electric energy conversion efficiency;
2: then screening out a rotating speed working condition corresponding to the appropriate fuel consumption rate according to the equal power line of the corresponding power in the universal characteristic curve of the engine;
the invention is to screen in the area surrounded by D curve in figure two, the meaning of the range surrounded by D curve in the universal characteristic curve is the engine working condition range with lower fuel consumption rate, the process, the energy conversion efficiency is obtained based on the whole vehicle database, based on the existing simulation data, the one-dimensional performance simulation is not satisfied to the process of re-performing steps S02, S03 and S04, and can not be repeated for many times, the step is completed after short screening, the proper engine working condition is screened out, and then the detailed design of each system of the engine in the next step is entered.
Step S05, according to a one-dimensional simulation data result of the engine, combining a selected point with the maximum power of the working condition, calculating the heat of the engine, calculating the theoretical flow of a lubricating system by radiating engine oil, primarily designing basic parameters of the lubricating system, calculating the heat radiation of other working conditions according to the basic parameters, and if the heat radiation meets the theoretical flow, rejecting the working condition in the subsequent design simulation and optimization process;
as shown in fig. 2 and 3, point C corresponds to 3200 rpm. Calculating the heat generated by the combustion of the engine per hour
Heat dissipation capacity of engine oil
Where P is engine power, η e For effective thermal efficiency, α 0 The percentage of heat dissipated by the engine oil to the heat generated is the required oil circulation
Wherein gamma is the specific gravity of the engine oil, c j Specific heat of the engine oil, delta t is the temperature rise of a single cycle; according to the engine oil circulation quantity, the parameters of the inner rotor and the outer rotor of the engine oil pump, the tooth height and other basic parameters can be preliminarily designed. And then, according to the designed tentative oil pump parameters, the theoretical displacement of the oil pump under the corresponding rotating speed under the other three working conditions is calculated, and whether the heat dissipation capacity is met or not is checked by combining the power of the point B and the power of the point C and the rotating speed. If so, rejecting the working condition in the subsequent design simulation and optimization process.
Theoretically, 2000rpm operating mode, engine power is small, thermal load is low, 2800rpm power is small corresponding to 3200rpm of heavy load, but the difference of rotating speeds is not large, so the theoretical inference shows that parameters of lubricating systems such as an oil pump and the like calculated through the 3200rpm operating mode design can well cover the two operating modes, two operating modes of 2000rpm (point A) and 2800rpm (point B) can be eliminated through actual calculation, and the idling operating mode needs to be included in simulation calculation for checking due to low rotating speed.
In step S06, designing a lubricating oil path of the engine and a flow direction indication of the lubricating oil path, designing input parameters by concept, and determining basic sizes of the oil paths, such as oil path diameters and clearance parameters, according to the remaining working conditions after elimination;
determining the basic size of each oil way, such as the diameter of the oil way, the clearance and the like according to the rest working conditions after the elimination, namely the idling speed of 800rpm and the idling speed of 3200rpm (point C);
by the formula, the method has the advantages that,
preliminarily calculate the relative motion speed of each kinematic pair d
V i In which D is i The minimum lubrication pressure of each kinematic pair can be further calculated for each kinematic pair diameter and n is the kinematic pair rotating speed
In step S07, a one-dimensional lubricating system model is built according to the preliminary parameters of the oil pump, the one-dimensional lubricating system model comprises all lubricating parts of the whole machine, lubricating oil passages of the whole machine and the like, and model boundaries such as theoretical discharge capacity of the oil pump, diameters of all oil passages, gaps and the like are set through calculation.
Step S08 includes performing an incomming Steady State calculation in a one-dimensional Steady State, calculating distribution of oil pressure and flow rate in the lubrication system by considering only the flow of the oil, and calculating performance parameters such as a P (pressure) -Q (flow rate) characteristic curve, an n (rotation rate) -Q (flow rate) curve, and the like at each rotation speed of the oil pump according to basic parameters of the oil pump.
In step S09, according to the obtained pressure and flow data of each kinematic pair lubricating oil circuit; the data is arranged, and the data is expressed by a formula,
preliminarily calculate the relative motion of each kinematic pairDynamic velocity V i In which D is i The minimum lubrication pressure of each kinematic pair can be further calculated for each kinematic pair diameter and n is the kinematic pair rotating speed
Comparing the data obtained by simulation, checking whether the data meet the lubrication requirements, carrying out optimization correction on the size of each oil path and the parameters of the oil pump and the like according to the comparison result, taking the corrected parameters as boundaries, carrying out the step S08 again, adjusting the pressure and the flow of the main oil path and each branch oil path to meet the working condition lubrication requirements, and finally completing the design of the lubrication system.
In step S09, if the check satisfies the lubrication requirement, step S10 is executed, and if the check does not satisfy the lubrication requirement, step S08 is executed again.
Example one
Two sets of comparison experiments are carried out, one method is a lubricating system design method according to the traditional engine all-working condition, the other method is a calculation method after working condition screening and elimination by using the method of the invention, as shown in figure 3, the characteristic curve is an oil pump P-Q characteristic curve of all-working condition, after being designed by an oil pump manufacturer, the calculation is carried out by simulation experiment, the calculation method comprises the oil pump outlet pressure represented by an abscissa and the flow of an ordinate, and different curves represent the pressure-flow relation under different rotating speeds, so that the characteristic curve can be obtained by calculating a large amount of pressure and flow data under various rotating speed working conditions, and by using the method of the invention, the characteristic curves under the rotation speeds of 800rpm and 3200rpm only need to be calculated, even if the characteristic curves are calculated at single points, at least 4/5 of data calculation and processing time and corresponding calculation resource occupancy can be saved in the oil pump calculation link;
the method comprises the steps of calculating only an oil pump in a lubricating system, calculating pressure and oil drainage quantity of a pressure relief oil way, selectively calculating oil inlet pressure and oil inlet flow, performing one-dimensional simulation calculation on the whole lubricating system, calculating all working conditions by using an overlarge calculated quantity, obtaining a huge database, and performing data processing to obtain a conclusion;
meanwhile, the traditional method is used for designing the lubricating system of the extended range engine, the lubricating capacity is excessive in design, namely the flow and pressure of the lubricating system under the full working condition are met, the flow and pressure of the lubricating system are larger than the working condition requirements of actual work, and as can be seen from the universal characteristic curve of fig. 2, the selected three working condition points A, B and C are all in a D curve with better fuel consumption rate, the power of the working system is smaller than the maximum power point of the engine, so that the heat load of the working system is lower than the maximum power point of the engine, and the lubricating flow is smaller than the maximum power point requirement, therefore, the whole lubricating system is larger, the lubricating oil amount is larger, and the weight and the cost of the whole engine are increased.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (10)
1. A design method of a lubricating system of an extended-range special engine is characterized by comprising the following steps:
s01: simulating the performance of the one-dimensional engine;
s02: screening the working conditions of the engine;
s03: compiling a control strategy;
s04: judging whether the one-dimensional whole vehicle performance simulation is met;
s05: eliminating and calculating the working conditions before system design;
s06; designing a lubricating system model framework;
s07: building a one-dimensional lubricating system model;
s08: one-dimensional lubricating system simulation and oil pump performance simulation and calculation;
s09: checking whether the optimized requirement of the lubricating system is met;
s10: and finishing the design.
2. The method for designing the lubricating system of the extended-range dedicated engine according to claim 1, wherein: in the step S01, a GT-POWER software is adopted to build a one-dimensional performance simulation model of the extended-range special engine, parameters of the cylinder diameter and the stroke boundary of the engine are given in the one-dimensional performance simulation model, an engine performance simulation result is obtained, and an engine characteristic curve is generated and comprises an engine rotating speed, a torque, an equal POWER line and an equal oil consumption rate line.
3. The method for designing a lubricating system of an extended range dedicated engine according to claim 1, wherein: in step S02, the step of screening the engine operating condition is as follows:
s02.1: according to a drawn-up finished automobile performance target value and in combination with an actual driving road condition, dividing the requirements of a finished automobile power module on an engine into three working conditions of low-speed cruising, normal driving and high-speed driving;
s02.2: the method is characterized in that the engine working conditions are screened by combining three working conditions of the whole vehicle, namely a low-speed cruising working condition, a normal driving working condition and a high-speed driving working condition, and one starting idling working condition is selected.
4. The method for designing a lubricating system of an extended range dedicated engine according to claim 1, wherein: in the step S04, if the one-dimensional performance of the whole vehicle meets the development target, executing the step S05; and if the one-dimensional performance of the whole vehicle does not meet the development target, screening the working conditions of the engine again according to the power or oil consumption requirement, and repeatedly executing the step S03 and the step S04 to finally finish the selection of the working conditions of the engine.
5. The method for designing a lubricating system of an extended range dedicated engine according to claim 1, wherein: in the step S05, the heat of the engine is calculated according to the one-dimensional simulation data result of the engine and the selected point with the maximum power of the working condition, the theoretical flow of the lubricating system is calculated by radiating the heat by the engine oil, the basic parameters of the lubricating system are preliminarily designed, the heat radiation of other working conditions is calculated according to the basic parameters, and if the basic parameters meet the requirements, the working condition is rejected in the subsequent design simulation and optimization process.
6. The method for designing a lubricating system of an extended range dedicated engine according to claim 1, wherein: in step S06, a lubricating oil path of the engine and a flow direction indication of the lubricating oil path are designed, and at the same time, the basic dimensions of each oil path, such as the diameter of the oil path and the clearance parameters, are determined according to the input parameters of the conceptual design and the remaining working conditions after the elimination.
7. The method for designing a lubricating system of an extended range dedicated engine according to claim 1, wherein: in the step S07, a one-dimensional lubricating system model is built according to the preliminary parameters of the oil pump, the one-dimensional lubricating system model includes all lubricating parts of the whole machine, lubricating oil passages of the whole machine and the like, and model boundaries such as theoretical discharge capacity of the oil pump, diameters of the oil passages, gaps and the like are set through calculation.
8. The method for designing a lubricating system of an extended range dedicated engine according to claim 1, wherein: in step S08, the method includes performing inconpressible Steady State calculation in a one-dimensional Steady State, calculating distribution of oil pressure and flow rate in the lubrication system by considering only flow of the oil, and calculating performance parameters such as a P (pressure) -Q (flow rate) characteristic curve and an n (rotation speed) -Q (flow rate) curve at each rotation speed of the oil pump according to basic parameters of the oil pump.
9. The method for designing the lubricating system of the extended-range dedicated engine according to claim 8, wherein: in step S09, the data is collated according to the obtained pressure and flow data of each kinematic pair lubricating oil path, and the data is expressed by a formula,
preliminarily calculate the relative movement velocity V of each kinematic pair i In which D is i For each kinematic pair diameter, n is the kinematic pair rotation speed, and the minimum lubrication pressure of each kinematic pair can be further calculated
Comparing the data obtained by simulation, and checking whether the data meets the lubrication requirement.
10. The method for designing a lubricating system of an extended range dedicated engine according to claim 9, wherein: in the step S09, if the check satisfies the lubrication requirement, the step S10 is executed, and if the check does not satisfy the lubrication requirement, the step S08 is executed again.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116541655A (en) * | 2023-07-07 | 2023-08-04 | 江苏兴锻智能装备科技有限公司 | Oil mass calculation and analysis method for lubrication system of hot die forging press |
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| CN116541655A (en) * | 2023-07-07 | 2023-08-04 | 江苏兴锻智能装备科技有限公司 | Oil mass calculation and analysis method for lubrication system of hot die forging press |
| CN116541655B (en) * | 2023-07-07 | 2023-09-05 | 江苏兴锻智能装备科技有限公司 | Oil mass calculation and analysis method for lubrication system of hot die forging press |
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