CN115577214B - Method and system for calculating virtual speed ratio of two-gear double electric drive bridge and calculating terminal - Google Patents
Method and system for calculating virtual speed ratio of two-gear double electric drive bridge and calculating terminal Download PDFInfo
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Abstract
The invention provides a method and a system for calculating a virtual speed ratio of a second-gear double electric drive bridge and a calculation terminal, which relate to the technical field of the second-gear double electric drive bridge, read standard cycle test vehicle speed data and calculate actual power of a first electric drive bridge and actual power of a second electric drive bridge; dividing the standard cycle test working condition into N sub-working conditions; respectively calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition; updating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge respectively; judging whether all the sub-working conditions are polled completely; and if so, updating the final virtual speed ratio range and displaying the final virtual speed ratio range. The invention solves the problem that the EBS only supporting one speed ratio is matched with a two-gear double-electric-drive axle vehicle type, reduces the EBS matching test cost, improves the EBS universality and quickens the project research and development progress.
Description
Technical Field
The invention relates to the technical field of two-gear double electric drive bridges, in particular to a method and a system for calculating a virtual speed ratio of a two-gear double electric drive bridge of a dumper and a calculation terminal.
Background
In order to meet the current requirements, when an accelerator of an E-POWER dumper type with a high speed is loosened or a brake pedal is stepped on, energy recovery for charging a battery and vehicle braking can be realized by generating negative torque for a motor. When the motor brake can not meet the full braking requirement of a driver, the EBS is required to brake. The EBS is called Electronic Brake Systems in general, and is called an Electronic Brake system in short as EBS.
Currently, the conventional EBS is an electric drive bridge with a matched speed ratio, and the speed ratio of the electric drive bridge is directly solidified into an EBS program through a calibration tool when in use. The two-gear double electric drive bridge in the two-gear double electric drive bridge vehicle type of the E-POWER dumper corresponds to 2 electric drive bridge speed ratios, and cannot be directly solidified into a general EBS program of the two electric drive bridge speed ratios through a calibration tool, so that the two electric drive bridges cannot be directly matched for use. If an EBS manufacturer is required to develop an EBS matched with a two-gear double-electric-drive axle vehicle type at present, a development and test period and a field verification period are required, the problem of matching use cannot be solved within a specified time limit, and the development period of the two-gear double-electric-drive axle vehicle type of the E-POWER dumper is also prolonged.
Disclosure of Invention
In order to solve the problem that the vehicle type of the two-gear double-electric-drive bridge of the E-POWER dumper is matched with the universal EBS, the invention provides a method for calculating the virtual speed ratio of the two-gear double-electric-drive bridge of the dumper, which comprises the following steps:
s101, reading standard cycle test vehicle speed data, and calculating the actual power of a first electric drive bridge and the actual power of a second electric drive bridge;
s102, dividing the work into N sub-working conditions;
s103, respectively calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition;
s104, respectively updating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge;
s105, judging whether all the sub-working conditions are polled completely; if yes, the step is shifted to S106, otherwise, the step is shifted to S103;
and S106, updating and displaying the final virtual speed ratio range.
It should be further noted that the actual POWER of the first electric drive bridge and the actual POWER of the second electric drive bridge respectively include the highest POWER, the lowest POWER and the different degrees of rapid acceleration conditions which are preset according to the vehicle type of the E-POWER dump truck.
It should be further noted that, in S103, the calculation manner of the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-operating condition includes:
(1) Respectively reading the actual power highest value, the actual power lowest value, the corresponding highest power vehicle speed and the corresponding lowest power vehicle speed of the current calculation bridge in the sub-working conditions;
(2) Setting a virtual speed ratio initial range;
(3) Updating the initial range of the virtual speed ratio;
(4) Calculating a virtual motor rotating speed range;
(5) Judging whether the rotating speed of the virtual motor meets the range, if so, rotating (6), and if not, rotating (3);
(6) Updating the initial range of the virtual speed ratio;
(7) Calculating a virtual motor torque range;
(8) Judging whether the torque of the virtual motor meets the range, if so, turning (9), and if not, turning (6);
(9) The virtual speed ratio range is updated.
It should be further noted that, the manner of calculating the virtual motor rotation speed range is as follows:
respectively calculating virtual motor rotating speed ranges, firstly calculating a virtual motor rotating speed range I by using a corresponding highest power vehicle speed and a virtual speed ratio initial range, and calculating a virtual motor rotating speed range II by using a corresponding lowest power vehicle speed and a virtual speed ratio initial range; and then, the rotating speed range I of the virtual motor and the rotating speed range II of the virtual motor are reduced to obtain the rotating speed range of the virtual motor.
It should be further noted that the virtual motor speed is calculated by the following formula:
the unit of the motor rotation speed is rpm, the unit of the vehicle speed is km/h, and the unit of the tire radius is m.
It should be further noted that the way of calculating the virtual motor torque range is as follows:
calculating a first virtual torque range by using the highest power and the virtual motor rotating speed range, and calculating a second virtual torque range by using the lowest power and the virtual motor rotating speed range; and then, the virtual motor torque range is obtained by reducing the virtual torque range I and the virtual torque range II.
It should be further noted that the virtual motor torque is calculated based on the power and the virtual motor speed by the following formula:
wherein the unit of the motor torque is N.m, the unit of the motor rotating speed is rpm, and the unit of the power is kw.
The invention also provides a virtual speed ratio calculation system of the two-gear double electric drive bridge of the dump truck, which comprises: the device comprises a data reading calculation module, a working condition division module, a calculation module, an updating module, a judgment module and a display module;
the data reading and calculating module is used for reading the standard cycle test vehicle speed data and calculating the actual power of the first electric drive bridge and the actual power of the second electric drive bridge;
the working condition dividing module is used for dividing the standard cycle test working condition into N sub-working conditions;
the calculating module is used for calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition respectively;
an update module for updating a virtual speed ratio range of the first electrically driven axle and a virtual speed ratio range of the second electrically driven axle, respectively;
the judging module is used for judging whether all the sub-working condition polling is finished; if so, updating the final virtual speed ratio range by the updating module, and displaying the final virtual speed ratio range by the display module;
if not, the calculation module continues to calculate.
The invention also provides a computer terminal which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the step of the virtual speed ratio calculation method of the two-gear double-electric-drive bridge of the dumper.
According to the technical scheme, the invention has the following advantages:
the method for calculating the virtual speed ratio of the two-gear double electric drive bridge of the dumper is used for calculating the virtual speed ratio of the electric drive bridge, calibrating and solidifying the virtual speed ratio into an EBS program, and meanwhile, applying the method to a whole-vehicle controller for calculating the torque of a virtual motor interacting with the EBS, so that the problem that the two-gear double electric drive bridge of the E-POWER dumper type corresponds to the two electric drive bridge speed ratios, and the two electric drive bridge speed ratios cannot be directly fixed into a general EBS program through a calibration tool, so that the two electric drive bridge speed ratios cannot be directly matched for use can be solved. The method for calculating the virtual speed ratio of the two-gear double electric drive bridge of the dumper can calculate the speed ratio of the two-gear double electric drive bridge in the two-gear double electric drive bridge type of the E-POWER dumper to a virtual electric drive bridge, and the virtual speed ratio is directly solidified by a calibration tool to be used in a general EBS program matched with the speed ratio of the electric drive bridge, so that the project research and development progress is accelerated.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for calculating a virtual speed ratio of a second-gear double electric drive axle of a dump truck;
FIG. 2 is a schematic diagram illustrating a process for calculating a virtual speed ratio range of each electric drive axle under each sub-condition;
FIG. 3 is a schematic view of a virtual speed ratio calculation system of a two-gear double electric drive axle of the dump truck.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides a method for calculating the virtual speed ratio of a two-gear double electric drive bridge of a dumper, which is used for calculating the virtual speed ratio of the electric drive bridge, calibrating and solidifying the virtual speed ratio into an Electronic Brake System (EBS) program and simultaneously applying the method to a whole vehicle controller for calculating the torque of a virtual motor interacting with the EBS, so that the problem that the two-gear double electric drive bridge in the two-gear double electric drive bridge type of the E-POWER dumper can not be directly matched and used because the two electric drive bridge speed ratios cannot be directly solidified into a general EBS program by a calibration tool and the two electric drive bridge speed ratios cannot be directly matched and used can be solved. The virtual speed ratio calculation method of the two-gear double-electric-drive bridge of the dumper can calculate the speed ratio of two electric-drive bridges of the two-gear double-electric-drive bridge in a dumper type of the E-POWER dumper into one virtual electric-drive bridge speed ratio, and the virtual speed ratio is directly solidified by a calibration tool and used in a universal EBS program, so that the project research and development progress is accelerated.
The method can be realized by a computing terminal which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and is characterized in that the steps of the method for calculating the virtual speed ratio of the two-gear double electric drive bridge of the dumper are realized when the processor executes the program.
The computing terminal machine can also comprise an input part of a keyboard, a mouse and the like; an output section including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker and the like; a storage section including a hard disk and the like; and a communication section including a Network interface card such as a LAN (Local Area Network) card, a modem, or the like. The communication section performs communication processing via a network such as the internet. The drive is also connected to the I/O interface as needed. So that the computer program read out therefrom is installed into the storage section as needed.
In the related technology of the dumper two-gear double-electric-drive-bridge virtual speed ratio calculation method provided by the invention, for example, a machine learning method, a deep learning method and other calculation methods can be adopted, and the application range of different methods is different.
Fig. 1 schematically shows a flowchart of a method for calculating a virtual speed ratio of a two-gear twin electric drive axle of a dump truck according to an embodiment of the disclosure. The method comprises the following steps:
s101, reading standard cycle test vehicle speed data, and calculating the actual power of a first electric drive bridge and the actual power of a second electric drive bridge;
the read standard cycle test vehicle speed data can be read from a test vehicle speed database, and can also be stored by a user, and the calculation terminal can read in the execution method process according to different vehicle types, cycle test vehicle speed data of different use working conditions and the like.
The selected standard cycles respectively comprise the highest POWER, the lowest POWER and different degrees of rapid acceleration working conditions which are preset by the type of the E-POWER dumper.
S102, dividing the standard cycle test working condition into N sub-working conditions;
s103, respectively calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition;
specifically, the calculation manner of the virtual speed ratio range of the first electric-driven bridge and the virtual speed ratio range of the second electric-driven bridge corresponding to each sub-operating condition in S103 includes:
(1) Respectively reading the actual maximum power value, the actual minimum power value, the corresponding maximum power vehicle speed and the corresponding minimum power vehicle speed of the current calculation bridge in the sub-working conditions;
(2) Setting a virtual speed ratio initial range;
(3) Updating the initial range of the virtual speed ratio;
(4) Calculating a virtual motor rotating speed range;
(5) Judging whether the rotating speed of the virtual motor meets the range, if so, rotating (6), and if not, rotating (3);
(6) Updating the initial range of the virtual speed ratio;
(7) Calculating a virtual motor torque range;
(8) Judging whether the torque of the virtual motor meets the range, if so, turning (9), and if not, turning (6);
(9) The virtual speed ratio range is updated.
Wherein, the mode of calculating the virtual motor speed range of first electricity drive bridge does:
calculating a first virtual motor rotating speed range of the first electric drive bridge by using the corresponding highest power vehicle speed and the virtual speed ratio initial range, and calculating a second virtual motor rotating speed range of the first electric drive bridge by using the corresponding lowest power vehicle speed and the virtual speed ratio initial range;
and obtaining the virtual motor rotating speed range by taking the minimum range of the virtual motor rotating speed range I of the first electric drive bridge and the virtual motor rotating speed range II of the first electric drive bridge.
The first virtual motor speed range of the first electric drive bridge has a first upper speed ratio limit and a first lower speed ratio limit. The second virtual motor speed range of the first electric drive bridge has a second upper speed ratio limit and a second lower speed ratio limit.
And if the first upper limit value of the virtual motor rotating speed range is smaller than the second upper limit value of the virtual motor rotating speed range, the lower limit value of the virtual motor rotating speed range is smaller than the second lower limit value of the virtual motor rotating speed range. The virtual motor rotating speed range is a second lower limit value of the virtual motor rotating speed range and a first upper limit value of the virtual motor rotating speed range.
And if the first upper limit value of the virtual motor rotating speed range is larger than the second upper limit value of the virtual motor rotating speed range, the lower limit value of the virtual motor rotating speed range is larger than the second lower limit value of the virtual motor rotating speed range. The virtual motor rotating speed range is a lower limit value of the virtual motor rotating speed range and a second upper limit value of the virtual motor rotating speed range.
And if the first upper limit value of the virtual motor rotating speed range is larger than the second upper limit value of the virtual motor rotating speed range, the lower limit value of the virtual motor rotating speed range is smaller than the second lower limit value of the virtual motor rotating speed range. The virtual motor rotating speed range is a second lower limit value of the virtual motor rotating speed range and a second upper limit value of the virtual motor rotating speed range.
For the virtual motor rotating speed of the invention, the virtual motor rotating speed can be calculated by the following formula:
the unit of the motor rotating speed is rpm, the unit of the vehicle speed is km/h, and the unit of the tire radius is m.
The calculation method of the virtual motor torque range comprises the following steps:
calculating a first virtual motor torque range of the first electric drive bridge by using the highest power and the virtual motor rotating speed range, and calculating a second virtual motor torque range of the first electric drive bridge by using the lowest power and the virtual motor rotating speed range; the virtual motor torque range one of the first electric drive bridge is then compared to the virtual motor torque range two of the first electric drive bridge and set as the virtual motor torque range based on the range min.
Calculating the virtual motor torque based on the power and the virtual motor speed by the following formula:
wherein the unit of the motor torque is N.m, the unit of the motor rotating speed is rpm, and the unit of the power is kw.
The second electric drive bridge virtual speed ratio calculation method is the same as above.
S104, respectively updating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge;
s105, judging whether all the sub-working conditions are polled; if yes, the step is shifted to S106, otherwise, the step is shifted to S103;
and S106, updating and displaying the final virtual speed ratio range.
Based on the virtual speed ratio calculation method for the two-gear double-electric-drive bridge of the dump truck, the problem that the EBS only supporting one speed ratio is matched with the two-gear double-electric-drive bridge vehicle type is solved, the EBS matching test cost is reduced, the EBS universality is improved, and the project research and development progress is accelerated.
Based on the method for calculating the virtual speed ratio of the second-gear double-electric-drive bridge of the dumper, as shown in fig. 2 and 3, the invention also provides a system for calculating the virtual speed ratio of the second-gear double-electric-drive bridge of the dumper, wherein the system comprises: the device comprises a data reading calculation module, a working condition division module, a calculation module, an updating module, a judgment module and a display module;
the data reading and calculating module is used for reading the standard cycle test vehicle speed data and calculating the actual power of the first electric drive bridge and the actual power of the second electric drive bridge;
the working condition dividing module is used for dividing the standard cycle test working condition into N sub-working conditions;
the calculating module is used for calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition respectively;
an update module for updating a virtual speed ratio range of the first electrically driven axle and a virtual speed ratio range of the second electrically driven axle, respectively;
the judging module is used for judging whether all the sub-working condition polling is finished; if so, updating the final virtual speed ratio range by the updating module, and displaying the final virtual speed ratio range by the display module;
if not, the calculation module continues to calculate.
Further, as a refinement and an expansion of the specific implementation of the system, in order to fully describe the specific implementation process in this embodiment, the virtual speed ratio calculation system for the two-gear twin-electric drive axle of the dump truck provided by the invention includes:
a) Reading standard cycle test vehicle speed data and calculating the actual power of a first electric drive bridge and the actual power of a second electric drive bridge;
b) Dividing the standard cycle test working condition into N sub working conditions;
the standard cycle test working condition comprises the highest POWER, the lowest POWER and different degrees of rapid acceleration working conditions which meet the design of the E-POWER dumper type; the standard cycle test selected was the CHTC-D cycle.
Dividing a standard cycle test working condition CHTC-D cycle into 8 sub-working conditions according to different degrees of rapid acceleration conditions; and eliminating the point with the vehicle speed of 0 and the power of 0 when the working conditions are divided.
c) Respectively calculating the virtual speed ratio ranges of the first electric drive bridge and the second electric drive bridge under each sub-working condition;
specifically, each time the virtual speed ratio ranges of the first and second electric-driven bridges of 1 sub-condition are calculated, the virtual speed ratio ranges of the first and second electric-driven bridges of the previous sub-condition need to be smaller, so as to obtain the updated virtual speed ratio ranges of the first and second electric-driven bridges.
After all the sub-working conditions are polled, acquiring the final virtual speed ratio ranges of the first electric drive bridge and the second electric drive bridge; and then, the first electric-drive bridge virtual speed ratio range and the second electric-drive bridge virtual speed ratio range are both reduced to obtain a final virtual speed ratio range.
d) Respectively updating the virtual speed ratio ranges of the first electric drive bridge and the second electric drive bridge;
e) Judging whether all the sub-working conditions are polled completely; if yes, then go to f), otherwise, go to c);
f) Updating the final virtual speed ratio range;
in this embodiment, the calculation of the virtual speed ratio range of each electric drive bridge under each sub-condition includes the following steps: as shown in figure 2 of the drawings, in which,
(1) respectively reading the actual power highest value, the actual power lowest value, the corresponding highest power vehicle speed and the corresponding lowest power vehicle speed of the current calculation bridge in the sub-working conditions; corresponding to step S300 in fig. 2;
(2) setting a virtual speed ratio initial range; corresponding to step S301 in fig. 2;
(3) updating the initial range of the virtual speed ratio; corresponding to step S302 in fig. 2;
(4) calculating a virtual motor rotating speed range; corresponding to step S303 in fig. 2;
(5) judging whether the rotating speed of the virtual motor meets the range, if so, rotating (6), and if not, rotating (3); corresponding to step S304 in fig. 2;
(6) updating the initial range of the virtual speed ratio; corresponding to step S305 in fig. 2;
(7) calculating a virtual motor torque range; corresponding to step S306 in fig. 2;
(8) judging whether the torque of the virtual motor meets the range, if so, turning (9), and if not, turning (6); corresponding to step S307 in fig. 2;
(9) updating the virtual speed ratio range; corresponding to step S308 in fig. 2;
the maximum value of the actual power, the minimum value of the actual power, the corresponding maximum power vehicle speed and the corresponding minimum power vehicle speed of the current calculated bridge in the 8 working conditions are { [40.6, -30.31,8.26,2.5], [160.1, -78.02, 23.6, 15.215], [76.8, -35.6, 14.5,9.28], [118.6, -67.27, 20.565, 17.6], [177.6, -391.8, 24.25, 44.2], [205.14, -122.31, 29.33, 21.23], [180.4, -127.8, 24.6, 19], [220, -232.8, 30.4, 29] }; the unit of power is Kw, and the unit of vehicle speed is Km/h;
calibrating a speed ratio range according to the general EBS matching, wherein the initial range of the virtual speed ratio is set to be 0.1, 25.5;
in this embodiment, for the first electric drive bridge and the second electric drive bridge, the virtual motor rotation speed range is calculated respectively, first, the virtual motor rotation speed range one is calculated by using the corresponding highest power vehicle speed and the virtual speed ratio initial range, and the virtual motor rotation speed range two is calculated by using the corresponding lowest power vehicle speed and the virtual speed ratio initial range; then, the rotating speed range I of the virtual motor and the rotating speed range II of the virtual motor are reduced to obtain a rotating speed range of the virtual motor;
in this embodiment, the virtual motor speed is calculated by the vehicle speed and the virtual speed ratio, and is calculated by the following formula:
the unit of the motor rotation speed is rpm, the unit of the vehicle speed is km/h, and the unit of the tire radius is m. The virtual motor speed range is [0,16255.750] rpm;
in the embodiment, the virtual motor torque range is calculated, firstly, the maximum power and the virtual motor rotating speed range are used for calculating the virtual motor torque range I, and the minimum power and the virtual motor rotating speed range are used for calculating the virtual motor torque range II; then, the torque range I of the virtual motor and the torque range II of the virtual motor are reduced to obtain the torque range of the virtual motor;
in this embodiment, the virtual motor torque is calculated by the power and the virtual motor speed, and is calculated by the following formula:
wherein the unit of the motor torque is N.m, the unit of the motor rotating speed is rpm, and the unit of the power is kw; the virtual motor torque range is [0,355] N.m.
The virtual speed ratio calculation system for the two-gear double-electric-drive bridge of the dumper provided by the invention solves the problem that the EBS only supporting one speed ratio is matched with a two-gear double-electric-drive bridge type, reduces the EBS matching test cost, improves the EBS universality and accelerates the project research and development progress.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the disclosed embodiments of the two-speed twin-electric drive axle virtual speed ratio calculation system for a dump truck provided by the present invention can be embodied in electronic hardware, computer software, or combinations thereof, and that the components and steps of the various examples have been described generally in terms of their functionality in the foregoing description for clarity of explanation of the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagrams shown in the figures provided by the present invention are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
As can be appreciated by one skilled in the art, various aspects of the method for calculating the virtual speed ratio of the two-gear twin electric drive axle of the dump truck provided by the invention can be realized as a system, a method or a program product. Accordingly, various aspects of the present disclosure may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A virtual speed ratio calculation method for a two-gear double electric drive axle of a dump truck is characterized by comprising the following steps of:
s101, reading standard cycle test vehicle speed data, and calculating the actual power of a first electric drive bridge and the actual power of a second electric drive bridge;
s102, dividing the standard cycle test working condition into N sub-working conditions;
s103, respectively calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition;
the calculation mode comprises the following steps:
(1) Respectively reading the actual maximum power value, the actual minimum power value, the corresponding maximum power vehicle speed and the corresponding minimum power vehicle speed of the current calculation bridge in the sub-working conditions;
(2) Setting a virtual speed ratio initial range;
(3) Updating the initial range of the virtual speed ratio;
(4) Calculating a virtual motor rotating speed range;
firstly, calculating a first virtual motor rotating speed range by utilizing a corresponding highest power vehicle speed and a virtual speed ratio initial range, and calculating a second virtual motor rotating speed range by utilizing a corresponding lowest power vehicle speed and the virtual speed ratio initial range; then, the rotating speed range I of the virtual motor and the rotating speed range II of the virtual motor are reduced to obtain a rotating speed range of the virtual motor;
calculating the virtual motor speed by the following formula:
wherein the unit of the rotating speed of the motor is rpm, the unit of the vehicle speed is km/h, and the unit of the radius of the tire is m;
(5) Judging whether the rotating speed of the virtual motor meets the range, if so, rotating (6), and if not, rotating (3);
(6) Updating the initial range of the virtual speed ratio;
(7) Calculating a virtual motor torque range;
calculating a first virtual torque range by using the highest power and the rotating speed range of the virtual motor, and calculating a second virtual torque range by using the lowest power and the rotating speed range of the virtual motor; then, the virtual torque range I and the virtual torque range II are reduced to obtain a virtual motor torque range;
calculating the virtual motor torque based on the power and the virtual motor speed by the following formula:
wherein the unit of motor torque is N.m, the unit of motor rotating speed is rpm, and the unit of power is kw;
(8) Judging whether the torque of the virtual motor meets the range, if so, turning (9), and if not, turning (6);
(9) Updating the virtual speed ratio range;
s104, respectively updating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge;
s105, judging whether all the sub-working conditions are polled; if yes, the step is shifted to S106, otherwise, the step is shifted to S103;
and S106, updating and displaying the final virtual speed ratio range.
2. The method for calculating the virtual speed ratio of the two-gear two-electric drive axle of the dump truck according to claim 1,
the actual power of the first electric drive bridge and the actual power of the second electric drive bridge respectively comprise the highest power, the lowest power and different degrees of rapid acceleration working conditions which are preset by the dump truck.
3. A virtual speed ratio calculation system of a second-gear double electric drive bridge of a dumper is characterized in that the system adopts the virtual speed ratio calculation method of the second-gear double electric drive bridge of the dumper as claimed in any one of claims 1-2;
the system comprises: the device comprises a data reading calculation module, a working condition division module, a calculation module, an updating module, a judgment module and a display module;
the data reading and calculating module is used for reading the standard cycle test vehicle speed data and calculating the actual power of the first electric drive bridge and the actual power of the second electric drive bridge;
the working condition dividing module is used for dividing the standard cycle test working condition into N sub-working conditions;
the calculating module is used for calculating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge corresponding to each sub-working condition respectively;
the updating module is used for respectively updating the virtual speed ratio range of the first electric drive bridge and the virtual speed ratio range of the second electric drive bridge;
the judging module is used for judging whether all the sub-working condition polling is finished; if so, updating the final virtual speed ratio range by the updating module, and displaying the final virtual speed ratio range by the display module;
if not, the calculation module continues to calculate.
4. A computing terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for calculating the virtual speed ratio of the two-gear two-electric-drive bridge of the dump truck according to any one of claims 1 to 2 when executing the program.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500904A (en) * | 2021-07-22 | 2021-10-15 | 中国北方车辆研究所 | Centralized two-gear electric drive axle |
| CN215826392U (en) * | 2021-07-17 | 2022-02-15 | 上海玛仕迪电气技术有限公司 | Virtual variable speed parallel shaft electric drive axle |
| CN114312350A (en) * | 2022-01-05 | 2022-04-12 | 一汽解放汽车有限公司 | Motor control method, motor control device, computer equipment and storage medium |
| CN114619874A (en) * | 2022-04-14 | 2022-06-14 | 特百佳动力科技有限公司 | Electric drive bridge and electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113401137B (en) * | 2021-06-01 | 2023-05-09 | 黄冈格罗夫氢能汽车有限公司 | Energy management method and system under intelligent driving and cruising working conditions |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215826392U (en) * | 2021-07-17 | 2022-02-15 | 上海玛仕迪电气技术有限公司 | Virtual variable speed parallel shaft electric drive axle |
| CN113500904A (en) * | 2021-07-22 | 2021-10-15 | 中国北方车辆研究所 | Centralized two-gear electric drive axle |
| CN114312350A (en) * | 2022-01-05 | 2022-04-12 | 一汽解放汽车有限公司 | Motor control method, motor control device, computer equipment and storage medium |
| CN114619874A (en) * | 2022-04-14 | 2022-06-14 | 特百佳动力科技有限公司 | Electric drive bridge and electric automobile |
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