CN113553663B - Model selection method of motor system, terminal and readable storage medium - Google Patents
Model selection method of motor system, terminal and readable storage medium Download PDFInfo
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- CN113553663B CN113553663B CN202110833096.XA CN202110833096A CN113553663B CN 113553663 B CN113553663 B CN 113553663B CN 202110833096 A CN202110833096 A CN 202110833096A CN 113553663 B CN113553663 B CN 113553663B
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Abstract
The invention discloses a model selection method, a terminal and a readable storage medium of a motor system, wherein the method comprises the following steps: the method comprises the steps of obtaining performance parameters of a vehicle, primarily selecting a temporary motor system with adaptive parameters for the vehicle according to the performance parameters, performing performance simulation on the vehicle according to the temporary motor system and expected working conditions of the vehicle to obtain first simulation working data, calculating energy consumption of the vehicle at different speeds to obtain first energy consumption data, obtaining a first high energy consumption interval of the vehicle according to the first simulation working data and the first energy consumption data, wherein the first high energy consumption interval is an energy consumption interval in which the first energy consumption data is within a preset energy consumption range, obtaining a first motor system high-efficiency interval corresponding to the first high energy consumption interval of the vehicle, and selecting the motor system according to the first motor system high-efficiency interval. The method and the device can solve the problem that the high-efficiency section cannot be determined when the motor is selected, and reduce the power consumption of the motor when a vehicle runs.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a type selection method of a motor system, a terminal and a readable storage medium.
Background
With the rapid development of new energy vehicles, national policy and regulations and users in the market all put forward higher requirements on mileage and power consumption of pure electric vehicles, and the matching of the transmission system of the whole vehicle is directly related to the energy consumption level of the whole vehicle, so the matching problem of the transmission system is the basis of the development of the whole vehicle at the earlier stage. At present, the rated power, the peak power, the rated torque, the peak torque, the rated rotating speed, the peak rotating speed and the speed ratio of a speed reducer of a driving motor can be determined according to the structural parameters and the performance parameters of the whole vehicle. However, it is difficult to determine the efficient region of the motor according to the parameters, so that the efficient region of the motor does not conform to the actual working conditions, which results in lower actual efficiency and larger energy consumption of the vehicle in the actual working process.
Disclosure of Invention
The invention provides a model selection method of a motor system, which aims to solve the problem that a high-efficiency region of a motor does not conform to the actual working condition and reduce the energy consumption of the motor in the actual running process of a vehicle.
In order to achieve the above object, the present invention provides a model selection method for an electric machine system, comprising the steps of:
acquiring performance parameters of the vehicle;
a temporary motor system with adaptive parameters is preliminarily selected for the vehicle according to the performance parameters;
performing performance simulation on the vehicle according to the temporary motor system and the expected working condition of the vehicle to obtain first simulation working data;
calculating the energy consumption of the vehicle at different speeds to obtain first energy consumption data;
according to the first simulation working data and the first energy consumption data, a first high energy consumption interval of the motor system is obtained, the first high energy consumption interval is an energy consumption interval with the first energy consumption data in a preset energy consumption range, and a first motor system high-efficiency interval corresponding to the first high energy consumption interval is obtained;
and selecting the motor system according to the high-efficiency interval of the first motor system.
Optionally, performing performance simulation on the vehicle according to the motor system and expected working conditions of the vehicle to obtain second simulation working data;
calculating the energy consumption of the vehicle at different speeds to obtain second energy consumption data;
according to the second simulation working data and the second energy consumption data, a second high energy consumption interval of the motor system is obtained, and a second motor system high efficiency interval corresponding to the second high energy consumption interval is obtained;
and optimizing the motor system according to the high-efficiency interval of the second motor system.
Optionally, the parameters of the motor system are adjusted such that the second motor system high efficiency zone replaces the first motor system high efficiency zone.
Optionally, equally dividing a preset speed threshold range into preset speed intervals;
and acquiring the energy consumption of the vehicle in each speed interval to obtain first energy consumption data.
Optionally, converting the first simulation working data into a corresponding first simulation working point set in a first preset energy consumption coordinate graph;
converting the first energy consumption data into a corresponding first energy consumption histogram in a first preset energy consumption coordinate graph;
acquiring a first energy consumption histogram with the vertical coordinate height being greater than a first preset height, and taking the interval as a first high energy consumption interval;
acquiring a first overlapped part of the first simulation working point set and the first high energy consumption interval in the first preset energy consumption coordinate graph;
reading the range of the first overlap determines a first motor system high efficiency interval.
Optionally, a first preset energy consumption coordinate graph is constructed by taking the rotation speed of the temporary motor as a horizontal axis and taking the torque of the temporary motor or the energy consumption of the motor as a vertical axis.
Optionally, converting the second simulation working data into a corresponding second simulation working point set in a preset efficiency coordinate graph;
converting the second energy consumption data into a corresponding second energy consumption histogram in a preset efficiency coordinate graph;
acquiring a second energy consumption histogram with the vertical coordinate height larger than a second preset height, and taking the interval as a second high energy consumption interval;
acquiring a second overlapped part of the second simulation working point set and the second high energy consumption interval in the second preset energy consumption coordinate graph;
reading the range of the second overlap determines a second motor system high efficiency zone.
Optionally, determining the wheel rim peak rotating speed of the vehicle wheel according to the highest design vehicle speed of the vehicle;
determining the wheel rim rated rotating speed and rated torque of the wheels according to the common vehicle speed of the vehicle;
determining the peak power and rated power of a vehicle motor according to the acceleration design and the vehicle speed design of the vehicle;
determining the wheel side peak torque of the wheel according to the climbing design of the vehicle;
and taking the wheel rim peak rotating speed, the wheel rim rated rotating speed, the rated torque, the peak power, the rated power and the wheel rim peak torque as the performance parameters of the vehicle.
In order to achieve the above object, the present application also proposes a terminal, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and which, when executed by the processor, implements the method for selecting a type of the motor system.
To achieve the above object, the present application also proposes a readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of model selection for the electric motor system.
According to the technical scheme, the working state data of all the battery packs are received, the performance parameters of the vehicle are obtained, the temporary motor system with the adaptive parameters is selected for the vehicle preliminarily according to the performance parameters, and the motor system is matched with the vehicle to perform a vehicle performance experiment in the early stage. According to the temporary motor system and the expected working condition of the vehicle, performing performance simulation on the vehicle, obtaining the running condition of the motor system and the loss condition of the vehicle by simulating the working state of the vehicle under a real road condition, obtaining first simulation working data through the vehicle performance simulation, calculating the energy consumption of the vehicle at different speeds to obtain first energy consumption data, obtaining a first high energy consumption section of the vehicle according to the first simulation working data and the first energy consumption data, wherein the first high energy consumption section is an energy consumption section of which the first energy consumption data is in a preset energy consumption range, the first high energy consumption section is a section with larger energy consumption of the vehicle, obtaining a first motor system high-efficiency section corresponding to the first high energy consumption section of the vehicle, namely the section with larger energy consumption of the vehicle and the motor high-efficiency section are overlapped as much as possible, and selecting the motor system according to the first motor system high-efficiency section. The high-efficiency region of the motor can be determined by the motor type selection method, the high-efficiency region of the motor is prevented from being not in accordance with actual working conditions, meanwhile, the efficiency of a motor system in the actual working process is improved, and actual energy consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a model selection method for a motor system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of model selection for an electric machine system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of model selection for an electric machine system according to another embodiment of the present invention;
FIG. 4 is a graph illustrating operating point profiles for a method of model selection for an electric machine system in accordance with one embodiment of the present invention;
FIG. 5 is a graph illustrating operating point profiles for a method of model selection for an electric machine system according to another embodiment of the present invention;
FIG. 6 is a graph of operating point profiles for a method of model selection for an electric motor system according to yet another embodiment of the present invention;
fig. 7 is a distribution diagram of operating points of a model selection method for a motor system according to still another embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a battery system provided in each embodiment of the present invention. The battery system comprises an execution module 01, a memory 02, a processor 03 and the like. Those skilled in the art will appreciate that the battery system shown in fig. 1 may also include more or fewer components than shown, or combine certain components, or a different arrangement of components. The processor 03 is connected to the memory 02 and the execution module 01, respectively, and the memory 02 stores a computer program, which is executed by the processor 03 at the same time.
The execution module 01 can perform performance simulation on the vehicle, analyze vehicle simulation information through a chart, and feed back the information to the processor 03.
The memory 02 may be used to store software programs and various data. The memory 02 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data or information created according to the use of the terminal, or the like. Further, the memory 02 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 03, which is a control center of the processing platform, connects various parts of the entire terminal by using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 02 and calling data stored in the memory 02, thereby integrally monitoring the vehicle. Processor 03 may include one or more processing units; preferably, the processor 03 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 03.
It will be understood by those skilled in the art that the battery system configuration shown in fig. 1 is not intended to be limiting of the battery pack and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
Various embodiments of the method of the present invention are presented in terms of the above-described hardware architecture.
Referring to fig. 2, in a first embodiment of the model selection method of the motor system of the present invention, the model selection method of the motor system includes:
step S100, acquiring performance parameters of the vehicle;
in this embodiment, the performance parameters of the vehicle are determined by the structure of the vehicle and the types of the components, the performance parameters of the vehicle include the performance parameters of the entire vehicle and the performance parameters of the components of the vehicle, the performance parameters of the entire vehicle include the highest speed per hour, the dynamic performance, the fuel economy, the operation stability and the like of the vehicle, and the performance parameters of the components at least include the performance parameters of the power battery, the performance parameters of the driving motor and the performance parameters of the speed reducer. The performance parameters of the power battery comprise energy density, working voltage, internal resistance and the like of the power battery, the performance parameters of the driving motor comprise rated power, peak power, rated torque, peak torque, rated rotating speed, peak rotating speed and the like of the driving motor, and the performance parameters of the speed reducer comprise speed ratio and the like of the speed reducer. In the early stage of vehicle development, various performance parameters of the vehicle are determined, parts meeting the performance parameters are selected or developed according to the performance parameters, and a vehicle structure is designed, so that the whole vehicle design can move towards the direction preset by developers, the vehicle meets the working requirements of the developers for the vehicle, and the vehicle is prevented from walking on a curved road in the vehicle development process.
Step S200, a temporary motor system with adaptive parameters is selected for the vehicle preliminarily according to the performance parameters;
in the embodiment, the matching degree of the vehicle transmission system, the power system and the whole vehicle is directly related to the energy consumption level of the vehicle, and the main constituent part of the transmission system is a motor system, so that the matching degree of the vehicle motor system, the power system and the whole vehicle is the basis of vehicle development. The temporary motor system is a motor system which is matched with a vehicle temporarily according to various performance parameters of the motor system in order to meet various performance simulation and tests of the vehicle in the early stage of vehicle development. In one embodiment, a temporary motor system includes a temporary motor and a temporary retarder. The performance parameters of the temporary motor system are thus the performance parameters of the temporary motor and the performance parameters of the temporary retarder. The performance parameters of the temporary motor at least comprise rated power, peak power, rated torque, peak torque, rated rotating speed, peak rotating speed and the like of the temporary motor, and the performance parameters of the temporary speed reducer at least comprise a speed ratio of the temporary speed reducer. In the development process of the motor system, firstly, performance parameters of the motor system are determined according to requirements of developers on the motor system, and then, an adaptive temporary motor system is developed or selected according to the performance parameters, so that the temporary motor system can basically meet the working requirements of the developers on the motor system, and the temporary motor system can be applied to the next vehicle simulation test and working condition test so as to further optimize the vehicle structure and guide the development of the motor system.
Step S300, performing performance simulation on the vehicle according to the temporary motor system and the expected working condition of the vehicle to obtain first simulation working data;
the performance simulation of the vehicle is generally applied to the early stage of vehicle development, and the performance simulation of the vehicle can simulate various conditions encountered by the vehicle in the actual working process so as to find possible problems of the vehicle in the working process in advance. In this embodiment, the performance simulation includes performing economy simulation, dynamic simulation, and the like on the vehicle, where the dynamic refers to an average driving speed that can be achieved and is determined by a longitudinal external force applied to the vehicle when the vehicle is traveling straight on a good road surface, and is usually determined by three indexes, i.e., a maximum vehicle speed, an acceleration time, and a maximum climbing slope, and the economic refers to an ability of the vehicle to travel economically with a fuel consumption as small as possible under a condition that the dynamic is ensured, and is usually measured by a fuel consumption that the vehicle travels for hundreds of kilometers under a certain operating condition or a certain fuel amount that enables the vehicle to travel for a mileage. The specific items of the performance simulation comprise a highest vehicle speed performance test, a lowest stable vehicle speed performance test, a climbing capability test, a starting continuous gear shifting acceleration performance test, an overrun acceleration performance test and the like, and the specific methods of the performance simulation comprise hundred-kilometer acceleration, hundred-kilometer hill climbing, starting continuous acceleration and the like; by analyzing the data obtained by the series of tests, whether the dynamic economy meets expected indexes or not can be preliminarily evaluated, a scheme of optimal balance between the dynamic economy and the economy is sought, and whether the scheme has enough competitiveness compared with market competitive products vehicles or not is found, so that the project development risk is reduced, and meanwhile, through simulation analysis, the project development period can be shortened and the cost of test verification can be reduced.
Step S400, calculating the energy consumption of the vehicle at different speeds to obtain first energy consumption data;
the energy consumption of the vehicle varies under different driving conditions of the vehicle, for example, if the vehicle is frequently accelerated and decelerated suddenly, the energy consumption is relatively high, and if the vehicle is basically in a constant speed driving state, the energy consumption of the motor system is relatively low. In the present embodiment, calculating the energy consumption amounts of the vehicle at different speeds refers to the energy consumption amount of the vehicle in a constant speed running state. For example, the test method may be: the same road conditions are respectively driven at constant speeds of different vehicle speeds (30 km/h,40km/h,50km/h,60km/h,70km/h,80km/h,90km/h,100km/h and 120 km/h), energy consumption of each driving is simultaneously obtained, and finally, the corresponding relation between the vehicle driving speed and the vehicle energy consumption is obtained and is used as first energy consumption data.
Step S500, obtaining a first high energy consumption interval of the motor system according to the first simulation working data and the first energy consumption data, wherein the first high energy consumption interval is an energy consumption interval of which the first energy consumption data is within a preset energy consumption range, and obtaining a first motor system high-efficiency interval corresponding to the first high energy consumption interval;
and S600, selecting a motor system according to the high-efficiency interval of the first motor system.
The running state of the motor of the automobile is different under different running speeds, and the energy consumption is also different. During the running process of the vehicle, an energy supply system of the vehicle inputs electric energy into an electric motor system, and the electric motor system converts the electric energy into mechanical energy and drives the vehicle to run. The energy supply system can be a power battery or an oil engine. In the process of converting electric energy into mechanical energy by a motor system, the efficiency of energy conversion is not fixed and can generate different energy conversion efficiencies in different motor system torque intervals and rotating speed intervals according to the difference of the structure and the material of the motor system, and each motor system has a high-efficiency interval with higher energy conversion efficiency. According to the characteristics, when the high-efficiency interval of the motor system just corresponds to the speed interval with higher energy consumption of the whole vehicle, the energy saving of the vehicle is facilitated.
Therefore, in the early stage of vehicle development, motor systems in different high-efficiency areas are developed and designed according to high-energy consumption areas of different vehicles, and the method plays a very important role in vehicle energy conservation.
In this embodiment, the first energy consumption data is a corresponding relationship between different vehicle driving speeds and vehicle energy consumption, and since there is no parameter of the motor efficiency at this time, the energy consumption of the vehicle can be directly equal to the energy consumption of the motor, that is, the efficiency value of the motor is constant to 1. The first simulation working data can be the corresponding relation of various performance parameters of the whole vehicle, the corresponding relation of the performance parameters of various parts of the vehicle and the corresponding relation of the various performance parameters of the whole vehicle and the performance parameters of the parts of the vehicle during performance simulation. In an embodiment, the first simulation working data is a corresponding relation between a motor rotating speed and a motor torque in a simulation state, a vehicle running speed interval corresponding to an interval with large energy consumption is obtained from the first energy consumption data, the vehicle running speed and the motor rotating speed have a corresponding relation, and therefore the motor torque and the motor rotating speed interval corresponding to the interval with high energy consumption can be obtained by combining the first simulation working data and the first energy consumption data. For example, it is known from the first energy consumption data that the energy consumption of the motor is large when the vehicle running speed is within the range of 30km/h-70km/h, the running speed of the vehicle is within the range of 30km/h-60km/h and the rotating speed interval of the corresponding motor is 2200-5600rpm according to the corresponding relation between the vehicle running speed and the rotating speed of the motor, and then the rotating speed interval of the motor is 2200-5600rpm when the rotating speed interval of the motor is 2200-5600rpm, and the rotating speed interval of the motor is 2200-5600rpm and the interval of the motor torque is 0-50Nm at this time is the high-efficiency interval of the motor system. Thus, referring to the above-mentioned findings, when developing and designing a motor system, the high-efficiency section of the motor system is made to cover the range of the rotation speed of 2200 to 5600rpm and the torque of 0 to 50 Nm. Therefore, in the speed interval with the highest energy consumption, such as 30km/h-70km/h, the corresponding energy conversion efficiency of the motor is also the highest, and the energy consumption can be saved.
Referring to fig. 3, in an embodiment, after step S600, the method further includes:
step S700, performing performance simulation on the vehicle according to the motor system and the expected working condition of the vehicle to obtain second simulation working data;
the performance simulation types in this embodiment are similar to step S300, and include dynamic simulation, economic simulation, and the like, but the specific items and modes of simulation can be adjusted by developers at any time according to requirements. Unlike step S300, in the vehicle performance simulation of step S300, the applied motor system is only the temporary motor system derived from the vehicle performance parameters, and the efficiency of the temporary motor in the temporary motor system is constantly set to 1. This obviously does not correspond to the conditions under which the motor actually works. In the vehicle performance simulation of the step, the applied motor system is optimized on the basis of the temporary motor system, the high-efficiency section of the motor system corresponds to the high-energy consumption section obtained by the temporary motor system experiment, and other energy consumption sections of the vehicle respectively have corresponding energy conversion efficiency. Therefore, the performance simulation combines the energy conversion efficiency of the motor system, the motor system has different energy conversion efficiencies under different rotating speeds and torques, and the high-efficiency interval of the motor system is determined by the first simulation working data and the first energy consumption data. Because the motor system adds the parameter of energy conversion efficiency in the simulation experiment, the economic dynamic simulation result of the vehicle is more accurate and more fit with the actual working condition, and the data of the performance simulation at this time is set as second simulation working data.
Step S800, calculating the energy consumption of the vehicle at different speeds to obtain second energy consumption data;
in this embodiment, step S400 of calculating the energy consumption of the vehicle at different speeds may be similar to calculate the energy consumption of the vehicle in different constant speed driving states. The specific manner of experiment can be adjusted by the developer at any time. Unlike step S400, the motor system applied in step S400 is only a temporary motor system derived from vehicle performance parameters, and the efficiency of the temporary motor in the temporary motor system is constantly set to 1. I.e. the energy consumption of the vehicle is directly taken as the energy consumption of the electric machine system. This obviously does not correspond to the actual operating conditions of the motor. In the step, the applied motor system is improved on the basis of the temporary motor system by combining the previous experimental result, the high-efficiency section of the temporary motor system corresponds to the high-energy consumption section obtained by the experiment of the temporary motor system, and other energy consumption sections of the vehicle respectively have corresponding energy conversion efficiency. This step thus combines the energy conversion efficiencies of the electric machine systems which have different energy conversion efficiencies at different rotational speeds and torques, so that the energy consumption of the electric machine system is equal to the energy consumption of the vehicle multiplied by the conversion efficiency of the electric machine system. The high efficiency interval of the motor system is determined by the first simulation working data and the first energy consumption data. Because this parameter of energy conversion efficiency has been added to the motor system in this experiment for the experimental result of vehicle is more accurate, more fits actual conditions, and the data of this experiment is set as second energy consumption data.
Step S900, obtaining a second high energy consumption interval of the motor system according to the second simulation working data and the second energy consumption data, and obtaining a second motor system high-efficiency interval corresponding to the second high energy consumption interval;
and S1000, optimizing the motor system according to the high-efficiency interval of the second motor system.
In this embodiment, since the parameter of the motor efficiency is added to the applied motor system, the second simulation working data and the second energy consumption data are more accurate and better conform to the actual working condition compared with the first simulation working data and the first energy consumption data. In addition, in the process of acquiring the second high energy consumption interval, the consideration on the working efficiency of the motor system is also increased. In an embodiment, the corresponding relation between the motor rotation speed and the motor torque in the simulation state is obtained from the second simulation working data, the vehicle running speed section corresponding to the section with larger energy consumption of the motor system is obtained from the second energy consumption data, and the motor torque and the motor rotation speed section corresponding to the section with higher energy consumption of the motor system can be obtained by combining the second simulation working data and the second energy consumption data due to the corresponding relation between the vehicle running speed and the motor rotation speed, and are used as the second motor system high-efficiency section, and then the corresponding motor system is developed and designed according to the second motor system high-efficiency section.
In one embodiment, step S1000 includes:
and adjusting the parameters of the motor system to enable the high-efficiency interval of the second motor system to replace the high-efficiency interval of the first motor system.
In this embodiment, referring to the above steps, the method for acquiring the high-efficiency section of the first motor system and the method for acquiring the high-efficiency section of the second motor system are almost the same. The difference is that the purpose of the first simulation is to guide the motor development in the early stage, and relevant parameters of the motor efficiency do not exist at that time. The purpose of the second simulation is to optimize the motor, and further optimize the high-efficiency section of the motor on the premise of having relevant parameters of the motor efficiency. The second simulation working data and the second energy consumption data are more accurate, so that the motor system developed after optimization can better conform to the actual working condition.
In one embodiment, step S400 includes:
equally dividing a preset speed threshold range into preset speed intervals;
the energy consumption of the vehicle in each of the speed intervals is obtained to obtain first energy consumption data.
The energy consumption of the vehicle varies in different operating conditions, for example, if the vehicle is accelerated and decelerated rapidly, the energy consumption of the vehicle is relatively high, and if the vehicle is basically in a constant speed driving state, the energy consumption of the vehicle is relatively low. In this embodiment, calculating the energy consumption of the vehicle at different speeds means that the running speed of the vehicle is relatively stable, and the running speed of the vehicle does not exceed the preset speed interval every time the vehicle is tested. The preset speed threshold range and the preset speed interval are both set in advance by the technicians in the field according to experimental rules in advance, and can be changed according to real-time requirements. For example, if the preset speed range is 10km/h-100km/h and the preset speed intervals are 9, the speed range included in each speed interval is 10km/h; if the preset speed range is 30km/h-70km/h and the preset speed intervals are 8, the speed range contained in each speed interval is 5km/h. The specific experimental method is as follows: the method comprises the steps of respectively driving the same road condition stably at different section speeds, and simultaneously obtaining the energy consumption of the vehicle driving each time, and finally obtaining the corresponding relation between the vehicle driving speed section and the section energy consumption to serve as first energy consumption data.
As shown in fig. 4, in an embodiment, step S500 includes:
converting the first simulation working data into a corresponding first simulation working point set in a first preset energy consumption coordinate graph;
in an embodiment, before the step of converting the first simulation operating data into the corresponding first simulation operating point set in the first preset energy consumption coordinate diagram, the method further includes:
and constructing a first preset energy consumption coordinate graph by taking the rotating speed of the temporary motor as a horizontal axis and taking the torque of the temporary motor or the energy consumption of the motor as a vertical axis.
The first simulation working data can be vehicle data such as the highest vehicle speed, the acceleration time, the maximum climbing gradient, the hundred kilometers of fuel consumption and the like of the vehicle, and can also be the running state and the running data of each part when the vehicle is subjected to various economic dynamic simulations. In this embodiment, the first simulation working data refers to a corresponding relationship between a motor rotation speed and a motor torque in the vehicle when the vehicle performs various performance simulations. The rotating speed of the motor is an abscissa in the energy consumption coordinate graph, and the torque of the motor is an ordinate in the energy consumption coordinate graph. Therefore, each corresponding value of the motor speed and the motor torque can be converted into a corresponding coordinate point in the first preset energy consumption coordinate graph. Therefore, the corresponding relation between all the motor rotating speeds and the motor torques can be converted into a coordinate point set, namely a first simulation working point set. The first preset energy consumption coordinate graph is a coordinate system graph preset by a person skilled in the art according to a preset rule. The step clearly shows the distribution situation of the motor torque and the motor rotating speed in a scatter diagram mode.
Converting the first energy consumption data into a corresponding first energy consumption histogram in a first preset energy consumption coordinate graph;
the first energy consumption data may be a corresponding relationship between vehicle running time and energy consumption of the motor system, or a corresponding relationship between vehicle running speed and energy consumption of the motor system. And because the conversion efficiency of the motor is defaulted to 1, the energy consumption of the motor system is the energy consumption of the vehicle. In this embodiment, the first energy consumption data refers to a corresponding relationship between the vehicle speed interval and the energy consumption during the current driving when the vehicle drives for the same distance in different speed intervals. The vehicle speed is an abscissa of the energy consumption coordinate graph, and the vehicle energy consumption is an ordinate of the energy consumption coordinate graph. Therefore, each speed interval and the corresponding energy consumption are a bar chart in the bar chart, wherein the energy consumption can be oil consumption or electricity consumption. For example, the vehicle runs for 10km in a speed interval of 10km/h-20km/h, the oil consumption of the running is 1.2L, and the group of data is a bar chart in a first preset energy consumption graph; the vehicle runs for 10km in a speed interval of 60-70 km/h, the oil consumption of the running is 1.0L, and the group of data is also a bar chart in a first preset energy consumption graph. The step clearly shows the trend that the energy consumption of the vehicle changes along with the continuous change of the speed interval in a mode of a histogram.
Acquiring a first energy consumption histogram with the vertical coordinate height larger than a first preset height, and taking the interval as a first high energy consumption interval;
the first preset height is set in advance according to preset rules by technicians in the field and can be changed at any time according to experimental needs. In this embodiment, if the height of the histogram is greater than the first preset height, it means that the corresponding energy consumption in the speed interval is greater than a preset energy consumption value. And taking the speed interval with the energy consumption larger than the preset energy consumption value as a first high energy consumption interval.
Acquiring a first overlapped part of the first simulation working point set and the first high energy consumption interval in the first preset energy consumption coordinate graph;
reading the range of the first overlap determines a first motor system high efficiency interval.
In this embodiment, the first simulation operating point set and the first energy consumption histogram are both marked in the first preset energy consumption coordinate graph. As shown in fig. 5, the abscissa of the first simulated operating point set is the motor speed, and the ordinate is the motor torque; the first energy consumption histogram has the abscissa of vehicle speed and the ordinate of vehicle energy consumption. Although the abscissa and ordinate of the first simulated operating point set and the first energy consumption histogram are different. However, since the vehicle speed and the motor rotation speed are proportional, there is a correspondence relationship between the vehicle speed and the motor rotation speed as an abscissa, and the positional relationship of the abscissa in the map can be determined based on this correspondence relationship. In the ordinate, the motor torque and the vehicle energy consumption have no corresponding relationship, but may be respectively drawn in the first preset energy consumption coordinate diagram according to the preset proportion and the corresponding relationship with the abscissa. Thus, the first simulation operating point set and the first energy histogram are overlapped, namely, a part of the first simulation operating point is overlapped with the first high energy consumption interval. Namely, the first overlapping portion may reflect the motor speed and the motor torque corresponding to the first high energy consumption interval. Because the high-efficiency interval is also related to the energy consumption of the motor, the energy consumption of the motor needs to be obtained through the energy consumption of the vehicle, and the energy consumption can be corresponding to the rotating speed and the torque of the motor. And because the efficiency of the temporary motor system is defaulted to 1, the energy consumption of the vehicle is the energy consumption of the motor system. In the step, four parameters of the motor rotating speed, the motor torque, the vehicle speed and the vehicle energy consumption in the same operation state are drawn in one graph, so that the corresponding relation of the four parameters is clearly shown, the distribution conditions of the motor rotating speed and the motor torque corresponding to different energy consumption intervals are also shown, and the difficulty of calculation and value taking is simplified.
As shown in fig. 6, in an embodiment, step S900 includes:
converting the second simulation working data into a corresponding second simulation working point set in a preset efficiency coordinate graph;
the preset efficiency coordinate graph is preset by workers in the field according to experimental requirements and preset rules, wherein an efficiency map of the motor is added in advance. The efficiency map is a motor efficiency distribution diagram which can reflect the efficiency distribution condition of the motor under different rotating speeds and different torques. In this embodiment, the horizontal axis of the second simulated operating point set still represents the motor speed, and the vertical axis still represents the motor torque. The second simulation working data is in the preset efficiency coordinate graph, and a second simulation working point set similar to the first simulation working point set is formed. The corresponding data of the motor rotating speed and the motor torque under the second simulation test is characterized in that the effective rate map in the efficiency coordinate graph is preset, the effective rate map is used for connecting points with the same efficiency into a loop line and projecting the loop line to a plane to form a horizontal curve, and the loop lines with different efficiencies cannot be matched. The lines are more dense at locations where the efficiency values are closer, and conversely, the spacing between lines is greater where the efficiency values differ more. Therefore, the second simulation working point set not only reflects the distribution situation of the motor torque and the motor rotating speed, but also can clearly reflect the efficiency distribution situation corresponding to different motor torques and motor rotating speeds.
Converting the second energy consumption data into a corresponding second energy consumption histogram in a preset efficiency coordinate graph;
in this embodiment, the second energy consumption data is a corresponding relationship between the vehicle speed interval and the energy consumption during the current driving when the vehicle drives at different speed intervals for the same distance. The vehicle speed is an abscissa of the energy consumption coordinate graph, and the vehicle energy consumption proportion is an ordinate of the energy consumption coordinate graph. The vehicle energy consumption proportion is the proportion of the energy consumption of the vehicle in a certain speed interval to the total energy consumption. Each speed interval and the corresponding energy consumption proportion are one of the bar charts, and for example, the total energy consumption of the vehicle in the driving process is set to be 1. Driving for 10km at a speed interval of 10km/h-20km/h, wherein the energy consumption of the driving accounts for 10% of the total energy consumption, and the group of data is a histogram in a first preset energy consumption coordinate graph; the vehicle runs for 10km in a speed interval of 60-70 km/h, the energy consumption of the running accounts for 12% of the total energy consumption, and the group of data is also a bar graph in the first preset energy consumption coordinate graph. The step clearly shows the trend that the energy consumption proportion of the vehicle changes along with the continuous change of the speed interval in a mode of a histogram.
As shown in fig. 7, acquiring an overlapping portion of the second energy consumption histogram and the second simulated operating point set, setting a portion of the overlapping portion where the energy consumption ratio of the motor is greater than a preset ratio as a second overlapping portion, and setting a motor operating interval represented by the second overlapping portion as a second high energy consumption interval;
reading the range of the second overlap determines a second motor system high efficiency zone.
In this embodiment, the second simulation operating point set and the second energy consumption histogram are both marked in the preset efficiency coordinate graph. The abscissa of the second simulation working point set is the motor rotating speed, and the ordinate is the motor torque; the abscissa of the second energy consumption histogram is the vehicle speed, and the ordinate is the vehicle energy consumption proportion. Although the abscissa and ordinate are different. However, since the vehicle speed and the motor speed are in direct proportion, the abscissa of the vehicle speed and the motor speed have a corresponding relationship, and the position relationship of the abscissa in the graph can be determined according to the corresponding relationship. In the ordinate, the motor torque and the vehicle energy consumption ratio have no corresponding relationship, but may be respectively drawn in a second preset energy consumption coordinate diagram according to a preset ratio and a corresponding relationship with the abscissa. Therefore, the second simulation working point set and the second energy histogram are overlapped, and correspondingly, the part of the second simulation working point which is overlapped with the second energy consumption histogram is the second overlapped part.
And the second energy consumption histogram in the second overlapping part reflects the energy consumption proportion of the whole vehicle, and the calculation of the energy consumption proportion of the motor is combined with the efficiency map of the motor. Namely, the proportion of the energy consumption of the second overlapping part point is multiplied by the efficiency of the motor at the point, so that the proportion of the energy consumption of the motor in the states of the rotating speed and the torque of the motor can be obtained.
The preset proportion is set in advance according to preset rules by technicians in the field and can be changed at any time according to experimental needs. In this embodiment, if the energy consumption proportion consumed by the motor is greater than the preset proportion, it means that the energy consumption proportion of the motor in the corresponding speed interval is greater than a certain preset energy consumption proportion. And taking the speed interval with the energy consumption proportion larger than the preset energy consumption proportion as a second high energy consumption interval.
In the step, five parameters of the motor rotating speed, the motor torque, the vehicle speed and the vehicle energy consumption and motor efficiency in the same running state are drawn in a graph, the corresponding relation of the five parameters is clearly shown, the distribution conditions of the motor rotating speed and the motor torque and the motor efficiency corresponding to different energy consumption intervals are also shown, and the difficulty of calculation and value taking is simplified.
In one embodiment, step S100 includes:
determining the wheel edge peak rotating speed of the vehicle wheels according to the highest design vehicle speed of the vehicle;
determining the wheel rim rated rotating speed and rated torque of the wheel according to the common vehicle speed of the vehicle;
determining the peak power and rated power of a vehicle motor according to the acceleration design and the vehicle speed design of the vehicle;
determining the wheel side peak torque of the wheel according to the climbing design of the vehicle;
and taking the wheel rim peak rotating speed, the wheel rim rated rotating speed, the rated torque, the peak power, the rated power and the wheel rim peak torque as the performance parameters of the vehicle.
In this embodiment, the performance parameters of the vehicle are determined according to the structural parameters of the entire vehicle. According to the performance parameters, the model selection and development of the motor system can be preliminarily determined in the early stage of motor development, and guiding significance is provided for the next experiment.
The invention also proposes a terminal comprising a memory, a processor, and a computer program stored on said memory and executable on said processor for performing the methods according to the various embodiments of the invention.
The invention also proposes a readable storage medium on which the computer program is stored. The computer-readable storage medium may be the Memory in fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, a terminal, or a network device) having a processor to execute the method according to the embodiments of the present invention.
In the present invention, the terms "first", "second", "third", "fourth" and "fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although the embodiment of the present invention has been shown and described, the scope of the present invention is not limited thereto, it should be understood that the above embodiment is illustrative and not to be construed as limiting the present invention, and that those skilled in the art can make changes, modifications and substitutions to the above embodiment within the scope of the present invention, and that these changes, modifications and substitutions should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of model selection for an electric machine system for use in a vehicle, the method comprising the steps of:
acquiring performance parameters of the vehicle;
a temporary motor system with adaptive parameters is preliminarily selected for the vehicle according to the performance parameters;
according to the temporary motor system and the expected working condition of the vehicle, performing performance simulation on the vehicle to obtain first simulation working data;
calculating the energy consumption of the vehicle at different speeds to obtain first energy consumption data;
according to the first simulation working data and the first energy consumption data, a first high energy consumption interval of the motor system is obtained, wherein the first high energy consumption interval is an energy consumption interval of which the first energy consumption data is in a preset energy consumption range, and a first motor system high-efficiency interval corresponding to the first high energy consumption interval is obtained;
selecting a motor system according to the high-efficiency interval of the first motor system;
after the step of selecting the motor system according to the high-efficiency interval of the first motor system, the method further comprises the following steps:
according to the motor system and the expected working condition of the vehicle, performing performance simulation on the vehicle to obtain second simulation working data, wherein the motor system has different energy conversion efficiencies under different rotating speeds and torques, and the performance simulation is combined with the energy conversion efficiency of the motor system;
calculating the energy consumption of the vehicle at different speeds to obtain second energy consumption data;
according to the second simulation working data and the second energy consumption data, a second high energy consumption interval of the motor system is obtained, and a second motor system high-efficiency interval corresponding to the second high energy consumption interval is obtained;
optimizing the motor system according to the high-efficiency interval of the second motor system;
the step of optimizing the motor system according to the second motor system high efficiency interval comprises:
and adjusting the parameters of the motor system to enable the high-efficiency interval of the second motor system to replace the high-efficiency interval of the first motor system.
2. A method of model selection for an electric machine system according to claim 1, characterized in that said step of calculating the energy consumption of said vehicle at different speeds to obtain first energy consumption data comprises:
equally dividing a preset speed threshold range into preset speed intervals;
the energy consumption of the vehicle in each of the speed intervals is obtained to obtain first energy consumption data.
3. The model selection method for the motor system according to claim 2, wherein the step of obtaining a first high energy consumption interval of the motor system according to the first simulation operation data and the first energy consumption data, the first high energy consumption interval being an energy consumption interval in which the first energy consumption data is within a preset energy consumption range, and the step of obtaining a first motor system high efficiency interval corresponding to the first high energy consumption interval includes:
converting the first simulation working data into a corresponding first simulation working point set in a first preset energy consumption coordinate graph;
converting the first energy consumption data into a corresponding first energy consumption histogram in a first preset energy consumption coordinate graph;
acquiring a first energy consumption histogram with the vertical coordinate height being greater than a first preset height, and taking the interval as a first high energy consumption interval;
acquiring a first overlapped part of the first simulation working point set and the first high energy consumption interval in the first preset energy consumption coordinate graph;
reading the range of the first overlap determines a first motor system high efficiency zone.
4. The method of model selection for an electric machine system according to claim 3, characterized in that said temporary electric machine system comprises a temporary electric machine and a temporary retarder, said step of converting said first simulated operation data into a corresponding first set of simulated operation points in a first preset energy consumption graph further comprising, before said step of converting said first simulated operation data into a corresponding first set of simulated operation points in a first preset energy consumption graph:
and constructing a first preset energy consumption coordinate graph by taking the rotating speed of the temporary motor as a horizontal axis and taking the torque of the temporary motor or the energy consumption of the motor as a vertical axis.
5. The model selection method for the motor system according to claim 1, wherein the step of obtaining a second high energy consumption interval of the motor system according to the second simulation operation data and the second energy consumption data, and the step of obtaining a second motor system high efficiency interval corresponding to the second high energy consumption interval comprises:
converting the second simulation working data into a corresponding second simulation working point set in a preset efficiency coordinate graph;
converting the second energy consumption data into a corresponding second energy consumption histogram in a preset efficiency coordinate graph;
acquiring an overlapped part of the second energy consumption histogram and the second simulation working point set, setting a part of the overlapped part, in which the energy consumption proportion of the motor is greater than a preset proportion, as a second overlapped part, and setting a motor working interval represented by the second overlapped part as a second high energy consumption interval;
reading the range of the second overlap determines a second motor system high efficiency zone.
6. The method of model selection for an electric machine system according to claim 5, characterized in that the step of obtaining performance parameters of the vehicle comprises:
determining the wheel edge peak rotating speed of the vehicle wheels according to the maximum design vehicle speed of the vehicle;
determining the wheel rim rated rotating speed and rated torque of the wheel according to the common vehicle speed of the vehicle;
determining the peak power and rated power of a vehicle motor according to the acceleration design and the vehicle speed design of the vehicle;
determining the wheel side peak torque of the wheel according to the climbing design of the vehicle;
and taking the wheel rim peak rotating speed, the wheel rim rated rotating speed, the rated torque, the peak power, the rated power and the wheel rim peak torque as the performance parameters of the vehicle.
7. A terminal, characterized in that it comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, which computer program, when being executed by the processor, carries out the steps of the method of model selection of an electric motor system according to any one of claims 1 to 6.
8. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of model selection of an electric motor system according to any one of claims 1 to 6.
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