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CN114132334A - Method and equipment for acquiring hundred-kilometer acceleration time of vehicle - Google Patents

Method and equipment for acquiring hundred-kilometer acceleration time of vehicle Download PDF

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Publication number
CN114132334A
CN114132334A CN202111456462.0A CN202111456462A CN114132334A CN 114132334 A CN114132334 A CN 114132334A CN 202111456462 A CN202111456462 A CN 202111456462A CN 114132334 A CN114132334 A CN 114132334A
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China
Prior art keywords
vehicle
acceleration
force
time
hundred
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Chinese (zh)
Inventor
吴涛
张跃宇
裴亦辰
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Zhiji Automobile Technology Co Ltd
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Zhiji Automobile Technology Co Ltd
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Priority to CN202111456462.0A priority Critical patent/CN114132334A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mathematical Physics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention aims to provide a method and equipment for acquiring the acceleration time of a vehicle per hundred kilometers. The invention can obtain more accurate zero-hundred acceleration time of the electric car under the condition of not carrying out real car test. In the initial stage of project planning, an engineer can conveniently obtain ideal power assembly parameters to perform motor model selection. By the method, an engineer can modify and expand an internal algorithm according to the generated data to correct a calculation result according to the requirement of the engineer in an engineering development stage, personalized customization is realized, and expansibility is high. The invention can be based on the existing power driving data, and is convenient for engineers to optimize the physical data of the vehicle by modifying the parameters of the whole vehicle so as to reduce the zero-hundred acceleration time.

Description

Method and equipment for acquiring hundred-kilometer acceleration time of vehicle
Technical Field
The invention relates to a method and equipment for acquiring hundred-kilometer acceleration time of a vehicle.
Background
With the popularization of household vehicles, the demand diversity of consumers for vehicles is increasing, and besides appearance and comfort, performance parameters of the vehicles also become an important index in the shopping process. One hundred kilometers of acceleration time (zero hundred acceleration time) is taken as an important performance index of one vehicle, and the one hundred kilometers of acceleration time often can reflect the comprehensive performance of one vehicle most.
At the early stage of developing a vehicle type, the zero-hundred acceleration time of a vehicle is usually a range which is preset, and at the moment, whether an assembly for researching and developing the vehicle power meets the requirement is judged, so that a rough required power parameter is obtained according to the experience of a research and development engineer; for the vehicle models which are already produced in mass production, if the zero-hundred acceleration time needs to be improved, the method can be completed by reducing the weight of the vehicle, improving the shape of the whole vehicle, reducing the wind resistance coefficient and the like. However, the time and money costs required to implement these methods are high.
Disclosure of Invention
The invention provides a method and equipment for acquiring hundred-kilometer acceleration time of a vehicle.
The invention provides a method for acquiring hundred-kilometer acceleration time of a vehicle, wherein the method comprises the following steps:
calculating stress parameters of a vehicle, wherein the stress parameters of the vehicle comprise: air resistance of vehicle
Figure DEST_PATH_IMAGE001
Rolling resistance of the rolling element
Figure 198392DEST_PATH_IMAGE002
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure DEST_PATH_IMAGE003
；
Calculating an assembly parameter of a vehicle, wherein the assembly parameter of the vehicle comprises: torque of wheel center
Figure 324742DEST_PATH_IMAGE004
The traction force on the wheel is
Figure DEST_PATH_IMAGE005
And the force generated by the motor of the vehicle doing work in unit time
Figure 745359DEST_PATH_IMAGE006
；
And acquiring the hundred-kilometer acceleration time of the vehicle based on the stress parameters and the assembly parameters of the vehicle.
Further, in the above method, the air resistance of the vehicle is calculated
Figure 155612DEST_PATH_IMAGE001
The method comprises the following steps:
calculating the air resistance of the vehicle by the following formula
Figure 190433DEST_PATH_IMAGE001
：
Figure DEST_PATH_IMAGE007
，
Wherein,
Figure 115664DEST_PATH_IMAGE008
is the density of the air and is,
Figure DEST_PATH_IMAGE009
(Frontal Area) is the Frontal Area of the vehicle,
Figure 277655DEST_PATH_IMAGE010
as is the speed of the vehicle,
Figure 604731DEST_PATH_IMAGE011
is the air resistance coefficient.
Further, in the above method, the rolling resistance of the vehicle is calculated
Figure 577497DEST_PATH_IMAGE002
The method comprises the following steps:
the rolling resistance of the vehicle is calculated by the following formula
Figure 990024DEST_PATH_IMAGE002
：
Figure 752444DEST_PATH_IMAGE012
，
Wherein,
Figure 934026DEST_PATH_IMAGE013
is the mass of the vehicle,
Figure 629757DEST_PATH_IMAGE014
is a proportionality coefficient, the size is about 9.8N/kg,
Figure 968728DEST_PATH_IMAGE015
is the weight of the vehicle,
Figure 534838DEST_PATH_IMAGE016
is the rolling resistance coefficient.
Further, in the above method, the component force applied downward along the inclined plane when the vehicle of the vehicle climbs the slope is calculated
Figure 570927DEST_PATH_IMAGE003
The method comprises the following steps:
calculating the component force applied downwards along the inclined plane when the vehicle climbs the slope based on the following formula
Figure 384031DEST_PATH_IMAGE003
：
Figure 771150DEST_PATH_IMAGE017
，
Wherein,
Figure 813056DEST_PATH_IMAGE018
is the inclined angle of the inclined plane when the vehicle climbs the slope,
Figure 657646DEST_PATH_IMAGE015
is the weight of the vehicle.
Further, in the above method, the wheel center torque is calculated
Figure 454701DEST_PATH_IMAGE004
(Wheel Center Torque) comprising:
the wheel center torque is calculated by the following formula
Figure 63537DEST_PATH_IMAGE004
：
Figure 237029DEST_PATH_IMAGE019
，
Wherein,
Figure 185394DEST_PATH_IMAGE020
is the peak torque of the electric machine of the vehicle,
Figure 153350DEST_PATH_IMAGE021
the motor-to-wheel transmission ratio of the vehicle.
Further, in the above method, the traction force on the wheel is calculated as
Figure 249481DEST_PATH_IMAGE022
The method comprises the following steps:
the traction force on the wheel is calculated by the following formula
Figure 882457DEST_PATH_IMAGE022
：
Figure 13224DEST_PATH_IMAGE023
，
Wherein,
Figure 152081DEST_PATH_IMAGE024
is the radius of the wheel of the vehicle.
Further, in the above method, a force generated by the motor of the vehicle performing work in a unit time is calculated
Figure 673193DEST_PATH_IMAGE006
The method comprises the following steps:
the force generated by the motor of the vehicle doing work in unit time is calculated by the following formula
Figure 922908DEST_PATH_IMAGE006
：
Figure 908182DEST_PATH_IMAGE025
，
Wherein the motor of the vehicle does work in unit time to produce a force
Figure 217940DEST_PATH_IMAGE006
In newtons;
Figure 977080DEST_PATH_IMAGE026
is the vehicle speed, and the unit is m/s;
Figure 30487DEST_PATH_IMAGE027
is the power of the electric machine of the vehicle.
Further, in the above method, obtaining the acceleration time of the vehicle over a hundred kilometers based on the stress parameter and the assembly parameter of the vehicle includes:
based on traction on wheels
Figure 870267DEST_PATH_IMAGE022
And the force generated by the motor of the vehicle doing work in unit time
Figure 288610DEST_PATH_IMAGE006
To obtain the traction force of the vehicle
Figure 581051DEST_PATH_IMAGE028
；
Air resistance based on vehicle
Figure 625099DEST_PATH_IMAGE001
Rolling resistance of the rolling element
Figure 319386DEST_PATH_IMAGE002
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 908630DEST_PATH_IMAGE003
To obtain a resultant force
Figure 953946DEST_PATH_IMAGE029
；
Vehicle-based traction
Figure 349156DEST_PATH_IMAGE030
Combined force of
Figure 897949DEST_PATH_IMAGE029
To obtain a force for vehicle acceleration
Figure 674406DEST_PATH_IMAGE031
；
Based on force for vehicle acceleration
Figure 941439DEST_PATH_IMAGE031
Obtaining the acceleration of the vehicle at each time interval
Figure 874760DEST_PATH_IMAGE032
；
Based on the acceleration of the vehicle at various time intervals
Figure 481322DEST_PATH_IMAGE033
Obtaining the speed difference between each time interval
Figure 740265DEST_PATH_IMAGE034
；
Based on the difference in speed between time intervals
Figure 229015DEST_PATH_IMAGE035
And obtaining the hundred-kilometer acceleration time of the vehicle.
Further, in the above method, the traction force is based on wheels
Figure 231606DEST_PATH_IMAGE022
And the force generated by the motor of the vehicle doing work in unit time
Figure 941942DEST_PATH_IMAGE006
To obtain the traction force of the vehicle
Figure 106207DEST_PATH_IMAGE036
The method comprises the following steps:
calculating the traction of the vehicle according to the following formula
Figure 285516DEST_PATH_IMAGE036
：
Figure 27818DEST_PATH_IMAGE037
。
Further, in the above method, the air resistance based on the vehicle
Figure 405709DEST_PATH_IMAGE001
Rolling resistance of the rolling element
Figure 944138DEST_PATH_IMAGE002
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 594431DEST_PATH_IMAGE003
To obtain a resultant force
Figure 938825DEST_PATH_IMAGE029
The method comprises the following steps:
the resultant force is calculated according to the following formula
Figure 436802DEST_PATH_IMAGE029
：
Figure 880553DEST_PATH_IMAGE038
。
Further, in the above method, the traction force is based on the vehicle
Figure 96771DEST_PATH_IMAGE036
Combined force of
Figure 979276DEST_PATH_IMAGE029
To obtain a force for vehicle acceleration
Figure 20176DEST_PATH_IMAGE031
The method comprises the following steps:
calculating a force for vehicle acceleration based on the following formula
Figure 697145DEST_PATH_IMAGE031
：
Figure 135079DEST_PATH_IMAGE039
。
Further, in the above method, the force for vehicle acceleration is based on
Figure 758959DEST_PATH_IMAGE031
Obtaining the acceleration of the vehicle at each time interval
Figure 716681DEST_PATH_IMAGE040
The method comprises the following steps:
calculating the acceleration of the vehicle at each time interval based on the following formula
Figure 17082DEST_PATH_IMAGE040
：
Figure 942312DEST_PATH_IMAGE041
，
Wherein,
Figure 104303DEST_PATH_IMAGE042
is the mass of the vehicle,
Figure 119795DEST_PATH_IMAGE043
in order to modify the parameters of the weight,
Figure 341829DEST_PATH_IMAGE044
。
further, the method is based on the acceleration of the vehicle at each time interval
Figure 488777DEST_PATH_IMAGE040
Obtaining the time intervals betweenDifference in velocity
Figure 516775DEST_PATH_IMAGE045
The method comprises the following steps:
the velocity difference between the time intervals is calculated by the following formula
Figure 885309DEST_PATH_IMAGE045
：
Figure 340561DEST_PATH_IMAGE046
，
Wherein,
Figure 240384DEST_PATH_IMAGE047
are time intervals.
Further, in the above method, after obtaining the acceleration time of the vehicle over a hundred kilometers based on the stress parameter and the assembly parameter of the vehicle, the method further includes:
acquiring the hundred-kilometer acceleration time of a vehicle defined by a user;
obtaining the peak torque of a motor of a corresponding vehicle based on the hundred kilometer acceleration time of the vehicle with a preset target
Figure 744177DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 780266DEST_PATH_IMAGE027
。
Further, in the above method, a peak torque of a motor of a corresponding vehicle is obtained based on a preset target vehicle acceleration time of one hundred kilometers
Figure 94835DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 216375DEST_PATH_IMAGE027
The method comprises the following steps:
judging whether the hundred-kilometer acceleration time of a preset target vehicle is within the time bandwidth of the current driving mode,
within the time bandwidth of the current driving mode, obtaining the peak torque of the motor of the corresponding vehicle based on the hundred kilometer acceleration time of the vehicle with a preset target
Figure 586177DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 680035DEST_PATH_IMAGE027
。
According to another aspect of the present invention, there is also provided a computer readable medium having computer readable instructions stored thereon, the computer readable instructions being executable by a processor to implement the method of any one of the above.
According to another aspect of the present invention, there is also provided an apparatus for information processing at a network device, the apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform any of the methods described above.
The method obtains the acceleration time of the vehicle in hundred kilometers based on the stress parameters and the assembly parameters of the vehicle, and can greatly reduce the conventional performance acceleration test period to reduce the research and development period in a theoretical calculation mode. The invention can obtain more accurate zero-hundred acceleration time of the electric car under the condition of not carrying out real car test. In the initial stage of project planning, an engineer can conveniently obtain ideal power assembly parameters to perform motor model selection. By the method, an engineer can modify and expand an internal algorithm according to the generated data to correct a calculation result according to the requirement of the engineer in an engineering development stage, personalized customization is realized, and expansibility is high. The invention can be based on the existing power driving data, and is convenient for engineers to optimize the physical data of the vehicle by modifying the parameters of the whole vehicle so as to reduce the zero-hundred acceleration time.
In addition, in the using stage of the user, the user can customize the required hundred kilometers of acceleration time. By using the mathematical model provided by the invention, the vehicle can calculate the required peak torque of the motor
Figure 477089DEST_PATH_IMAGE048
And the power of the motor of the vehicle
Figure 85925DEST_PATH_IMAGE027
And matching the vehicle powertrain parameters according to the hundred-kilometer acceleration time input by the user. The vehicle acceleration performance under different driving modes can be customized by a driver. The method can realize stronger user-defined attribute, and the user can obtain driving power feeling more in line with the user.
The invention can provide convenience and custom attributes for the engineer development stage and the user use stage based on the engineer angle and the user angle.
Drawings
Fig. 1 is a flowchart of a method for acquiring a hundred kilometers acceleration time of a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a mathematical model of a hundred kilometer acceleration time of a vehicle in accordance with an embodiment of the present invention;
FIG. 3 is a flowchart of a method for obtaining corresponding vehicle powertrain parameters based on a hundred kilometers acceleration time of the vehicle, in accordance with an embodiment of the present invention;
FIG. 4 is a force analysis diagram of a vehicle traveling on flat ground according to an embodiment of the present invention;
FIG. 5 is a force analysis graph of a vehicle traveling on a grade according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of wheel center torque of an embodiment of the present invention;
FIG. 7 is a parameter diagram for a hundred kilometer acceleration time calculation for a vehicle according to an embodiment of the present invention;
FIG. 8 is a graph of vehicle speed versus time in accordance with an embodiment of the present invention;
FIG. 9 is an interface diagram illustrating how a user may customize a hundred kilometers acceleration time for a current driving mode, in accordance with an embodiment of the present invention;
FIG. 10 is a flow chart of vehicle powertrain parameter acquisition in accordance with an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
In a typical configuration of the present application, the terminal, the device serving the network, and the trusted party each include one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include non-transitory computer readable media (transient media), such as modulated data signals and carrier waves.
As shown in fig. 1, the present invention relates to a method for acquiring a hundred kilometers acceleration time of a vehicle, the method comprising:
step S1, calculating stress parameters of the vehicle, wherein the stress parameters of the vehicle comprise: air resistance of vehicle
Figure 993838DEST_PATH_IMAGE049
Rolling resistance of the rolling element
Figure 817569DEST_PATH_IMAGE050
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 785525DEST_PATH_IMAGE051
；
Step S2, calculating the assembly parameters of the vehicle, wherein the assembly parameters of the vehicle comprise: torque of wheel center
Figure 819340DEST_PATH_IMAGE052
The traction force on the wheel is
Figure 530944DEST_PATH_IMAGE005
And the force generated by the motor of the vehicle doing work in unit time
Figure 463042DEST_PATH_IMAGE006
；
And step S3, acquiring the hundred-kilometer acceleration time of the vehicle based on the stress parameters and the assembly parameters of the vehicle.
Here, in the field of engineering development, the hundred kilometers acceleration time, i.e., the zero hundred acceleration time, is often influenced by many factors such as air resistance, rolling resistance, and the quality of the entire vehicle.
The method obtains the acceleration time of the vehicle in hundred kilometers based on the stress parameters and the assembly parameters of the vehicle, and can greatly reduce the conventional performance acceleration test period to reduce the research and development period in a theoretical calculation mode. The invention can obtain more accurate zero-hundred acceleration time of the electric car under the condition of not carrying out real car test. In the initial stage of project planning, an engineer can conveniently obtain ideal power assembly parameters to perform motor model selection. By the method, an engineer can modify and expand an internal algorithm according to the generated data to correct a calculation result according to the requirement of the engineer in an engineering development stage, personalized customization is realized, and expansibility is high. The invention can be based on the existing power driving data, and is convenient for engineers to optimize the physical data of the vehicle by modifying the parameters of the whole vehicle so as to reduce the zero-hundred acceleration time.
The parameters specifically used for calculating the acceleration time of the vehicle in hundred kilometers are shown in fig. 7.
As shown in fig. 4 and 5, the vehicle of the present invention accelerates for a hundred kilometersIn one embodiment of the obtaining method of (1), in step S1, the air resistance of the vehicle is calculated
Figure 601899DEST_PATH_IMAGE001
The method comprises the following steps:
calculating the air resistance of the vehicle by the following formula
Figure 919748DEST_PATH_IMAGE001
：
Figure 435043DEST_PATH_IMAGE007
，
Wherein,
Figure 358000DEST_PATH_IMAGE008
is the density of the air and is,
Figure 667758DEST_PATH_IMAGE009
(Frontal Area) is the Frontal Area of the vehicle,
Figure 472903DEST_PATH_IMAGE010
as is the speed of the vehicle,
Figure 713260DEST_PATH_IMAGE011
is the air resistance coefficient.
As shown in fig. 4 and 5, in an embodiment of the method for acquiring acceleration time of a vehicle in hundred kilometers, step S1 is to calculate the rolling resistance of the vehicle
Figure 553040DEST_PATH_IMAGE053
The method comprises the following steps:
the rolling resistance of the vehicle is calculated by the following formula
Figure 971383DEST_PATH_IMAGE002
：
Figure 529404DEST_PATH_IMAGE054
，
Wherein,
Figure 809338DEST_PATH_IMAGE013
is the mass of the vehicle,
Figure 706886DEST_PATH_IMAGE014
is a proportionality coefficient, the size is about 9.8N/kg,
Figure 358448DEST_PATH_IMAGE015
is the weight of the vehicle,
Figure 325136DEST_PATH_IMAGE055
is the rolling resistance coefficient.
In an embodiment of the method for acquiring hundred kilometers acceleration time of a vehicle of the present invention, step S1 is performed to calculate a component force applied downward along an inclined plane when the vehicle climbs a slope
Figure 720345DEST_PATH_IMAGE003
The method comprises the following steps:
calculating the component force applied downwards along the inclined plane when the vehicle climbs the slope based on the following formula
Figure 973865DEST_PATH_IMAGE003
：
Figure 796327DEST_PATH_IMAGE056
，
Wherein,
Figure 751776DEST_PATH_IMAGE018
is the inclined angle of the inclined plane when the vehicle climbs the slope,
Figure 950676DEST_PATH_IMAGE013
is the mass of the vehicle,
Figure 619555DEST_PATH_IMAGE014
is a proportionality coefficient, the size is about 9.8N/kg,
Figure 550602DEST_PATH_IMAGE015
is the weight of the vehicle.
As shown in FIG. 4, when the vehicle is traveling on a horizontal road, the gradient is
Figure 304931DEST_PATH_IMAGE057
，
Figure 307523DEST_PATH_IMAGE058
。
As shown in fig. 6, in an embodiment of the method for acquiring acceleration time of a vehicle per hundred kilometers, in step S2, the wheel center torque is calculated
Figure 830908DEST_PATH_IMAGE004
(Wheel Center Torque) comprising:
the wheel center torque is calculated by the following formula
Figure 119807DEST_PATH_IMAGE004
：
Figure 361432DEST_PATH_IMAGE059
，
Wherein,
Figure 902135DEST_PATH_IMAGE020
is the peak torque of the electric machine of the vehicle,
Figure 968442DEST_PATH_IMAGE021
(Motor to Wheel Gear Ratio) is the Motor to Wheel Gear Ratio of the vehicle.
As shown in fig. 6, in an embodiment of the method for acquiring an acceleration time of a vehicle of the present invention, in step S2, the traction force on the wheel is calculated as
Figure 569188DEST_PATH_IMAGE005
The method comprises the following steps:
the traction force on the wheel is calculated by the following formula
Figure 32530DEST_PATH_IMAGE022
：
Figure 376924DEST_PATH_IMAGE060
，
Wherein,
Figure 547005DEST_PATH_IMAGE061
is the radius of the wheel of the vehicle.
In an embodiment of the method for acquiring hundred kilometers of acceleration time of a vehicle, in step S2, a force generated by a motor of the vehicle doing work in unit time is calculated
Figure 318652DEST_PATH_IMAGE006
The method comprises the following steps:
the force generated by the motor of the vehicle doing work in unit time is calculated by the following formula
Figure 269291DEST_PATH_IMAGE006
：
Figure 151796DEST_PATH_IMAGE062
，
Wherein the motor of the vehicle does work in unit time to produce a force
Figure 691230DEST_PATH_IMAGE006
In newtons;
Figure 633779DEST_PATH_IMAGE063
is the vehicle speed, and the unit is m/s;
Figure 71713DEST_PATH_IMAGE027
is the power of the electric machine of the vehicle.
In an embodiment of the method for acquiring an acceleration time of a vehicle per hundred kilometers, in step S3, the method for acquiring an acceleration time of a vehicle per hundred kilometers based on a stress parameter and an assembly parameter of the vehicle includes:
step S31, based on traction force on wheels
Figure 695593DEST_PATH_IMAGE022
And the force generated by the motor of the vehicle doing work in unit time
Figure 902583DEST_PATH_IMAGE006
To obtain the traction force of the vehicle
Figure 16033DEST_PATH_IMAGE030
；
Step S32, based on the air resistance of the vehicle
Figure 941263DEST_PATH_IMAGE001
Rolling resistance of the rolling element
Figure 853987DEST_PATH_IMAGE002
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 181063DEST_PATH_IMAGE003
To obtain a resultant force
Figure 199834DEST_PATH_IMAGE064
；
Step S33, based on the traction force of the vehicle
Figure 612361DEST_PATH_IMAGE030
Combined force of
Figure 578043DEST_PATH_IMAGE064
To obtain a force for vehicle acceleration
Figure 759626DEST_PATH_IMAGE031
；
Step S34, based on force for vehicle acceleration
Figure 214878DEST_PATH_IMAGE031
Obtaining the acceleration of the vehicle at each time interval
Figure 36072DEST_PATH_IMAGE032
；
Step S35, acceleration based on vehicle at each time interval
Figure 602183DEST_PATH_IMAGE032
Obtaining the speed difference between each time interval
Figure 903851DEST_PATH_IMAGE065
；
Step S36, based on the speed difference between each time interval
Figure 530005DEST_PATH_IMAGE065
And obtaining the hundred-kilometer acceleration time of the vehicle.
Specifically, the method of steps S31 to S36 may be repeated at time intervals of 0.1 second (or less) in Excel, the speed of the vehicle may be integrated into an electronic table, a vehicle speed-time relationship diagram as shown in fig. 8 is generated accordingly, and finally the hundred kilometer acceleration time is obtained according to a table look-up method.
As shown in fig. 2, the mathematical model of the acceleration time of the vehicle in hundred kilometers may be a mathematical model based on Excel or MATLAB, and the mathematical model based on Excel or MATLAB may be summarized as follows:
step one, carrying out stress analysis on the whole vehicle;
step two, calculating the wheel center torque
Figure 589227DEST_PATH_IMAGE004
；
Step three, calculating the force generated by the work of the motor of the vehicle in unit time
Figure 959029DEST_PATH_IMAGE006
；
Step four, calculating the total value of the resistance (air resistance, the resistance of gravity downwards along the inclined plane and rolling resistance) of three independent vehicles by using a formula
Figure 115204DEST_PATH_IMAGE029
；
Step five, calculating the traction force value on the wheel according to the maximum torque value provided by the motor
Figure 600674DEST_PATH_IMAGE022
By traction force
Figure 209510DEST_PATH_IMAGE005
Minus the total resistance value
Figure 117423DEST_PATH_IMAGE064
To calculate the force required for acceleration
Figure 128104DEST_PATH_IMAGE031
；
Step six, calculating the acceleration of the vehicle at each time interval
Figure 33744DEST_PATH_IMAGE066
；
Step seven, the speed difference between all the time points is obtained
Figure 129875DEST_PATH_IMAGE065
；
Step eight, speed difference between all time points
Figure 841480DEST_PATH_IMAGE065
Sequentially superposed to obtain the relationship between the vehicle speed and the time as shown in fig. 8;
step nine, finally, a Look-up Table (Look-up Table) can be used to obtain the hundred kilometers acceleration time based on the relationship between the vehicle speed and the time.
The mathematical model for calculating the hundred-kilometer acceleration time can be embedded into Excel to be used for automatically generating a speed-time curve. The acceleration change is conveniently looked over directly perceivedly to the engineer, and the engineer can revise vehicle dynamic parameter by oneself according to self demand in order to look over the influence of different parameters to whole car performance.
In an embodiment of the method for acquiring hundred kilometers of acceleration time of a vehicle, step S31 is based on traction force on wheels
Figure 706667DEST_PATH_IMAGE022
And electricity of vehicleThe machine is operated in unit time to produce force
Figure 32475DEST_PATH_IMAGE006
To obtain the traction force of the vehicle
Figure 615903DEST_PATH_IMAGE028
The method comprises the following steps:
calculating the traction of the vehicle according to the following formula
Figure 131198DEST_PATH_IMAGE036
：
Figure 850893DEST_PATH_IMAGE067
。
In this case, unlike conventional internal combustion engines, the rotational speed of a conventional internal combustion engine must reach a certain value in order to burst the maximum torque of the vehicle; according to the characteristics of the motor, the motor can explode to generate peak torque at the starting stage of the vehicle, namely at a low rotating speed. Therefore, in the starting stage of the electric vehicle, the torque determines the explosive force of the vehicle; and the power determines the vehicle's top speed.
Based on the principle, the motor does work in unit time to generate force
Figure 98334DEST_PATH_IMAGE006
Is determined by the speed at that moment
Figure 169059DEST_PATH_IMAGE068
The calculation is carried out to calculate the initial value of the vehicle, in the starting stage,
Figure DEST_PATH_IMAGE069
the smaller
Figure 222465DEST_PATH_IMAGE006
The larger the value of (c). The traction force of the vehicle is determined by the traction force on the wheels generated by the torque in the starting stage so as to determine the acceleration performance of the whole vehicle
Figure 762380DEST_PATH_IMAGE030
By selecting respective time intervals
Figure 243039DEST_PATH_IMAGE006
And
Figure 801060DEST_PATH_IMAGE022
is chosen to be the smaller value of:
Figure 330261DEST_PATH_IMAGE037
。
in an embodiment of the method for acquiring one hundred kilometers acceleration time of a vehicle, step S32 is performed based on air resistance of the vehicle
Figure 24548DEST_PATH_IMAGE001
Rolling resistance of the rolling element
Figure 941688DEST_PATH_IMAGE002
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 721425DEST_PATH_IMAGE003
To obtain a resultant force
Figure 303585DEST_PATH_IMAGE029
The method comprises the following steps:
the resultant force is calculated according to the following formula
Figure 117958DEST_PATH_IMAGE029
：
Figure 940420DEST_PATH_IMAGE038
。
In one embodiment of the method for acquiring hundred kilometers of acceleration time of a vehicle, step S33 is based on the traction force of the vehicle
Figure 207453DEST_PATH_IMAGE028
Combined force of
Figure 344037DEST_PATH_IMAGE029
To obtain a force for vehicle acceleration
Figure 12915DEST_PATH_IMAGE031
The method comprises the following steps:
calculating a force for vehicle acceleration based on the following formula
Figure 6279DEST_PATH_IMAGE031
：
Figure 760608DEST_PATH_IMAGE070
。
In one embodiment of the method for acquiring hundred kilometers acceleration time of the vehicle, step S34 is based on the force for vehicle acceleration
Figure 186036DEST_PATH_IMAGE031
Obtaining the acceleration of the vehicle at each time interval
Figure 709421DEST_PATH_IMAGE032
The method comprises the following steps:
calculating the acceleration of the vehicle at each time interval based on the following formula
Figure 139265DEST_PATH_IMAGE032
：
Figure 380891DEST_PATH_IMAGE041
，
Wherein,
Figure 593698DEST_PATH_IMAGE042
is the mass of the vehicle,
Figure 237168DEST_PATH_IMAGE043
in order to modify the parameters of the weight,
Figure 572335DEST_PATH_IMAGE044
。
in this case, all linear and rotational bodies contain kinetic energy, i.e., the rotational bodies contain rotational inertia. During the running of the vehicle, components such as tires and motors have rotational motion, and the rotational inertia of the rotationally moving objects is usually difficult to calculate. Thus, it is possible to provide
Figure 301256DEST_PATH_IMAGE043
Usually as a correction parameter to correct the weight as the effective mass of the whole vehicle, and the weight is taken
Figure 567022DEST_PATH_IMAGE044
。
In an embodiment of the method for acquiring hundred kilometers acceleration time of the vehicle, step S35 is based on the acceleration of the vehicle at each time interval
Figure 64999DEST_PATH_IMAGE033
Obtaining the speed difference between each time interval
Figure 836646DEST_PATH_IMAGE065
The method comprises the following steps:
the velocity difference between the time intervals is calculated by the following formula
Figure 724968DEST_PATH_IMAGE065
：
Figure 607473DEST_PATH_IMAGE071
，
Wherein,
Figure 959957DEST_PATH_IMAGE047
are time intervals.
As shown in fig. 3, in an embodiment of the method for acquiring an acceleration time of a vehicle hundred kilometers, after obtaining the acceleration time of the vehicle hundred kilometers based on the stress parameter and the assembly parameter of the vehicle in step S3, the method further includes:
step S4, acquiring the hundred-kilometer acceleration time of the vehicle defined by the user;
step S5, obtaining the peak torque of the corresponding motor of the vehicle based on the hundred kilometer acceleration time of the vehicle with a preset target
Figure 902505DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 28855DEST_PATH_IMAGE027
。
Here, as shown in fig. 3, during the user using stage, the user can customize the required acceleration time of hundred kilometers. By using the mathematical model provided by the invention, the vehicle can calculate the required peak torque of the motor
Figure 449472DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 922042DEST_PATH_IMAGE027
And matching the vehicle powertrain parameters according to the hundred-kilometer acceleration time input by the user.
The same mathematical model can be also used for the user-defined acceleration time of the vehicle in hundred kilometers. The matched power parameters are reversely deduced by inputting the ideal hundred kilometers acceleration time of the user.
Through the embodiment, the driver can customize the vehicle acceleration performance in different driving modes. The method can realize stronger user-defined attribute, and the user can obtain driving power feeling more in line with the user.
The invention can provide convenience and custom attributes for the engineer development stage and the user use stage based on the engineer angle and the user angle.
As shown in fig. 10, in an embodiment of the method for acquiring a hundred kilometers acceleration time of a vehicle according to the present invention, step S5 is performed to obtain a peak torque of a motor of the corresponding vehicle based on a preset target of the hundred kilometer acceleration time of the vehicle
Figure 35491DEST_PATH_IMAGE020
And a vehiclePower of electric machine
Figure 898405DEST_PATH_IMAGE027
The method comprises the following steps:
step S51, determining whether the hundred kilometer acceleration time of the preset target vehicle is within the time bandwidth of the current driving mode,
step S52, within the time bandwidth of the current driving mode, the peak torque of the motor of the corresponding vehicle is obtained based on the hundred kilometer acceleration time of the vehicle with the preset target
Figure 122713DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 184210DEST_PATH_IMAGE027
。
Here, the user often drives in a specific driving mode during driving, for example: sport mode, comfort mode, Economic mode, while each particular driving mode often has been calibrated for a corresponding power output, such as: the speed-up time of one hundred kilometers in the Sport mode can be most approximate to or even exceed the speed-up time of one hundred kilometers in the original factory calibration, and the speed-up time of one hundred kilometers in the Eco (economic) mode has larger discrepancy with the performance of the original factory calibration, so that the Sport mode does not meet the actual requirements of users.
Therefore, the present embodiment can set the acceleration time bandwidth in each driving mode in advance.
FIG. 9 illustrates a UI interface of a vehicle machine using the functionality of the present invention. As shown in the figure, if the official one hundred kilometers acceleration time of the vehicle is 3.9s, the custom top speed in the Sport mode is 3.9 s; by setting the bandwidth in each driving mode, the user can customize the hundred kilometers of acceleration time in the current driving mode. The operating logic is shown in fig. 10.
According to another aspect of the present invention, there is also provided a computer readable medium having computer readable instructions stored thereon, the computer readable instructions being executable by a processor to implement the method of any one of the above.
According to another aspect of the present invention, there is also provided an apparatus for information processing at a network device, the apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform any of the methods described above.
The details of each device embodiment of the present invention may specifically refer to the corresponding parts of each method embodiment, and are not described herein again.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
It should be noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, as an Application Specific Integrated Circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
In addition, some of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can invoke or provide the method and/or technical solution according to the present invention through the operation of the computer. Program instructions which invoke the methods of the present invention may be stored on a fixed or removable recording medium and/or transmitted via a data stream on a broadcast or other signal-bearing medium and/or stored within a working memory of a computer device operating in accordance with the program instructions. An embodiment according to the invention herein comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform a method and/or solution according to embodiments of the invention as described above.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Claims (17)

1. A method for acquiring the hundred-kilometer acceleration time of a vehicle comprises the following steps:
calculating stress parameters of a vehicle, wherein the stress parameters of the vehicle comprise: air resistance of vehicle
Figure 243282DEST_PATH_IMAGE001
Rolling resistance of the rolling element
Figure 98106DEST_PATH_IMAGE002
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 877843DEST_PATH_IMAGE003
；
Calculating an assembly parameter of a vehicle, wherein the assembly parameter of the vehicle comprises: torque of wheel center
Figure 273052DEST_PATH_IMAGE004
The traction force on the wheel is
Figure 775840DEST_PATH_IMAGE005
And the force generated by the motor of the vehicle doing work in unit time
Figure 598303DEST_PATH_IMAGE006
；
And acquiring the hundred-kilometer acceleration time of the vehicle based on the stress parameters and the assembly parameters of the vehicle.
2. The method of claim 1, wherein the air resistance of the vehicle is calculated
Figure 865336DEST_PATH_IMAGE001
The method comprises the following steps:
calculating the air resistance of the vehicle by the following formula
Figure 1919DEST_PATH_IMAGE001
：
Figure 670798DEST_PATH_IMAGE007
，
Wherein,
Figure 664162DEST_PATH_IMAGE008
is the density of the air and is,
Figure 605442DEST_PATH_IMAGE009
(Frontal Area) is the Frontal Area of the vehicle,
Figure 342454DEST_PATH_IMAGE010
as is the speed of the vehicle,
Figure 865839DEST_PATH_IMAGE011
is the air resistance coefficient.
3. The method of claim 1, wherein the rolling resistance of the vehicle is calculated
Figure 295683DEST_PATH_IMAGE002
The method comprises the following steps:
the rolling resistance of the vehicle is calculated by the following formula
Figure 474992DEST_PATH_IMAGE002
：
Figure 750115DEST_PATH_IMAGE012
，
Wherein,
Figure 393586DEST_PATH_IMAGE013
is the mass of the vehicle,
Figure 728753DEST_PATH_IMAGE014
is a proportionality coefficient, the size is about 9.8N/kg,
Figure 134371DEST_PATH_IMAGE015
is the weight of the vehicle,
Figure 213186DEST_PATH_IMAGE016
is the rolling resistance coefficient.
4. The method of claim 1, wherein the component force experienced down a slope when the vehicle of the vehicle is climbing a slope is calculated
Figure 711163DEST_PATH_IMAGE003
The method comprises the following steps:
based on the following formulaComponent force applied downwards along inclined plane when vehicle climbs slope
Figure 482810DEST_PATH_IMAGE003
：
Figure 371131DEST_PATH_IMAGE017
，
Wherein,
Figure 253637DEST_PATH_IMAGE018
is the inclined angle of the inclined plane when the vehicle climbs the slope,
Figure 606121DEST_PATH_IMAGE015
is the weight of the vehicle.
5. The method of claim 1, wherein the wheel center torque is calculated
Figure 548669DEST_PATH_IMAGE004
(Wheel Center Torque) comprising:
the wheel center torque is calculated by the following formula
Figure 173554DEST_PATH_IMAGE004
：
Figure 594171DEST_PATH_IMAGE019
，
Wherein,
Figure 66741DEST_PATH_IMAGE020
is the peak torque of the electric machine of the vehicle,
Figure 117874DEST_PATH_IMAGE021
the motor-to-wheel transmission ratio of the vehicle.
6. According to the rightThe method of claim 5, wherein calculating the on-wheel tractive effort is
Figure 43104DEST_PATH_IMAGE005
The method comprises the following steps:
the traction force on the wheel is calculated by the following formula
Figure 267412DEST_PATH_IMAGE005
：
Figure 328909DEST_PATH_IMAGE022
，
Wherein,
Figure 301675DEST_PATH_IMAGE023
is the radius of the wheel of the vehicle.
7. The method of claim 6, wherein a force generated by a motor of the vehicle doing work per unit time is calculated
Figure 714202DEST_PATH_IMAGE006
The method comprises the following steps:
the force generated by the motor of the vehicle doing work in unit time is calculated by the following formula
Figure 742201DEST_PATH_IMAGE006
：
Figure 923784DEST_PATH_IMAGE024
，
Wherein the motor of the vehicle does work in unit time to produce a force
Figure 51140DEST_PATH_IMAGE006
In newtons;
Figure 950963DEST_PATH_IMAGE025
is the vehicle speed, and the unit is m/s;
Figure 517073DEST_PATH_IMAGE026
is the power of the electric machine of the vehicle.
8. The method of claim 7, wherein deriving a vehicle hundred kilometer acceleration time based on force parameters and assembly parameters of the vehicle comprises:
based on traction on wheels
Figure 818742DEST_PATH_IMAGE027
And the force generated by the motor of the vehicle doing work in unit time
Figure 366266DEST_PATH_IMAGE028
To obtain the traction force of the vehicle
Figure 753385DEST_PATH_IMAGE029
；
Air resistance based on vehicle
Figure 123187DEST_PATH_IMAGE030
Rolling resistance of the rolling element
Figure 951466DEST_PATH_IMAGE031
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 748520DEST_PATH_IMAGE032
To obtain a resultant force
Figure 357356DEST_PATH_IMAGE033
；
Vehicle-based traction
Figure 530849DEST_PATH_IMAGE029
Combined force of
Figure 229945DEST_PATH_IMAGE033
To obtain a force for vehicle acceleration
Figure 197901DEST_PATH_IMAGE034
；
Based on force for vehicle acceleration
Figure 294033DEST_PATH_IMAGE034
Obtaining the acceleration of the vehicle at each time interval
Figure 5637DEST_PATH_IMAGE035
；
Based on the acceleration of the vehicle at various time intervals
Figure 808508DEST_PATH_IMAGE035
Obtaining the speed difference between each time interval
Figure 947366DEST_PATH_IMAGE036
；
Based on the difference in speed between time intervals
Figure 530794DEST_PATH_IMAGE036
And obtaining the hundred-kilometer acceleration time of the vehicle.
9. The method of claim 8, wherein the on-wheel traction is based
Figure 780509DEST_PATH_IMAGE037
And the force generated by the motor of the vehicle doing work in unit time
Figure 952734DEST_PATH_IMAGE028
To obtain the traction force of the vehicle
Figure 262492DEST_PATH_IMAGE038
The method comprises the following steps:
calculating the traction of the vehicle according to the following formula
Figure 333216DEST_PATH_IMAGE039
：
Figure 324306DEST_PATH_IMAGE040
。
10. The method of claim 9, wherein the air resistance is based on a vehicle
Figure 164086DEST_PATH_IMAGE030
Rolling resistance of the rolling element
Figure 644746DEST_PATH_IMAGE031
And the component force applied downwards along the inclined plane when the vehicle climbs the slope
Figure 937187DEST_PATH_IMAGE032
To obtain a resultant force
Figure 482700DEST_PATH_IMAGE033
The method comprises the following steps:
the resultant force is calculated according to the following formula
Figure 176987DEST_PATH_IMAGE033
：
Figure 828548DEST_PATH_IMAGE041
。
11. The method of claim 10, wherein the tractive effort is based on a vehicle
Figure 873864DEST_PATH_IMAGE038
Combined force of
Figure 206757DEST_PATH_IMAGE033
To obtain a force for vehicle acceleration
Figure 755550DEST_PATH_IMAGE034
The method comprises the following steps:
calculating a force for vehicle acceleration based on the following formula
Figure 843592DEST_PATH_IMAGE034
：
Figure 297576DEST_PATH_IMAGE042
。
12. The method of claim 11, wherein the force for vehicle acceleration is based
Figure 496476DEST_PATH_IMAGE034
Obtaining the acceleration of the vehicle at each time interval
Figure 899775DEST_PATH_IMAGE035
The method comprises the following steps:
calculating the acceleration of the vehicle at each time interval based on the following formula
Figure 158718DEST_PATH_IMAGE035
：
Figure 850731DEST_PATH_IMAGE043
，
Wherein,
Figure 587743DEST_PATH_IMAGE044
is the mass of the vehicle,
Figure 111128DEST_PATH_IMAGE045
in order to modify the parameters of the weight,
Figure 540972DEST_PATH_IMAGE046
。
13. the method of claim 8, wherein the acceleration is based on acceleration of the vehicle at various time intervals
Figure 205434DEST_PATH_IMAGE047
Obtaining the speed difference between each time interval
Figure 746137DEST_PATH_IMAGE036
The method comprises the following steps:
the velocity difference between the time intervals is calculated by the following formula
Figure 389608DEST_PATH_IMAGE036
：
Figure 724774DEST_PATH_IMAGE048
，
Wherein,
Figure 391379DEST_PATH_IMAGE049
are time intervals.
14. The method of claim 1, wherein after obtaining the acceleration time of the vehicle over a hundred kilometers based on the force parameters and the assembly parameters of the vehicle, further comprising:
acquiring the hundred-kilometer acceleration time of a vehicle defined by a user;
obtaining the peak torque of a motor of a corresponding vehicle based on the hundred kilometer acceleration time of the vehicle with a preset target
Figure 470193DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 968171DEST_PATH_IMAGE026
。
15. The method of claim 14, wherein the peak torque of the motor of the corresponding vehicle is derived based on a preset target vehicle acceleration time of one hundred kilometers
Figure 474238DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 877407DEST_PATH_IMAGE026
The method comprises the following steps:
judging whether the hundred-kilometer acceleration time of a preset target vehicle is within the time bandwidth of the current driving mode,
within the time bandwidth of the current driving mode, obtaining the peak torque of the motor of the corresponding vehicle based on the hundred kilometer acceleration time of the vehicle with a preset target
Figure 759912DEST_PATH_IMAGE020
And the power of the motor of the vehicle
Figure 112396DEST_PATH_IMAGE026
。
16. A computer readable medium having computer readable instructions stored thereon which are executable by a processor to implement the method of any one of claims 1 to 15.
17. An apparatus for information processing at a network device, the apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform the method of any one of claims 1 to 15.
CN202111456462.0A 2021-12-02 2021-12-02 Method and equipment for acquiring hundred-kilometer acceleration time of vehicle Pending CN114132334A (en)

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