CN115081266A - Method and system for calculating efficiency of electric drive system - Google Patents
Method and system for calculating efficiency of electric drive system Download PDFInfo
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- CN115081266A CN115081266A CN202210504362.9A CN202210504362A CN115081266A CN 115081266 A CN115081266 A CN 115081266A CN 202210504362 A CN202210504362 A CN 202210504362A CN 115081266 A CN115081266 A CN 115081266A
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Abstract
An electric drive system efficiency calculation method and system. The motor is instructed to be dragged to start to operate according to the rotating speed of the rack module, and meanwhile, the instruction of the torque instruction module is sent to the control strategy module 1; the driving module performs switching action according to the PWM signal and outputs three-phase alternating current, and the driving module calculates the driving module loss during each switching action according to loss data; the driving module performs switching action according to the PWM signal and outputs three-phase alternating current, and the driving module calculates the driving module loss during each switching action according to loss data; driving a motor module to output torque and calculating a loss value of the motor according to the three-phase current output by the driving module; meanwhile, the current sensor module feeds back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction or not, and if so, feedback control is carried out to improve the accuracy of the output torque of the motor module.
Description
Technical Field
The invention relates to the technical field of electric drive system efficiency, in particular to an electric drive system efficiency calculation method and system.
Background
With the increasing prominence of environmental problems and energy problems, the reduction of oil consumption and power consumption of automobiles becomes the continuous improvement target of the global automobile industry. In a pure electric vehicle, an electric drive system and an air conditioner are main power consumption components and are key components influencing the driving mileage. The evaluation of the efficiency of the electric drive system in the concept design stage is particularly important for the selection of the scheme of the electric drive system and the setting of the mileage index of the whole vehicle.
The efficiency of the electric drive system is that the current bus voltage/current is multiplied by input power, the current torque/rotating speed of the electric drive system is multiplied by output power of the electric drive system, the ratio of the output power to the input power is the efficiency of the electric drive system, and the core of the efficiency is to accurately calculate the loss power of the electric drive system, namely a motor controller and a motor. The design target is to meet the endurance mileage index of the electric automobile.
However, at present, the efficiency of the electric drive system is mainly based on a bench test, the bench test needs to trial-produce sample pieces, the test period is long, and the timeliness requirement in the concept design stage cannot be met, so that the simulation prediction of the efficiency of the electric drive system becomes a necessary and effective method.
In the prior art, patent document CN107757419B discloses a method, an apparatus, and a vehicle for controlling motor efficiency of an electric vehicle, where an electric drive system efficiency is obtained by multiplying a first electric drive system efficiency corresponding to a current motor rotation speed and a current motor actual torque by a first correction coefficient, and the second electric drive system efficiency is obtained by correcting the first electric drive system efficiency, and the core of obtaining the electric drive system efficiency is obtaining the correction coefficient. The correction coefficient is a first correction coefficient corresponding to the current motor bus voltage and the current electric drive system temperature according to a second incidence relation between the motor bus voltage, the electric drive system temperature and the system efficiency correction coefficient, and a second motor system efficiency is obtained according to the first motor system efficiency and the first correction coefficient and serves as the current target motor system efficiency.
In conclusion, simulation prediction of the efficiency of an electric drive system becomes a necessary method.
Disclosure of Invention
The invention solves the problem of simulation prediction of the efficiency of the electric drive system.
The invention discloses an electric drive system efficiency calculation method, which comprises the following steps:
step S1, according to the rotating speed of the rack module, the motor is instructed to be dragged to start to operate, and simultaneously, the instruction of the torque instruction module is sent to the control strategy module 1;
step S2, converting the control strategy into an Amesim callable model according to the actual application, and outputting a PWM signal to a driving module after internal operation;
step S3, the driving module performs switching action according to the PWM signal and outputs three-phase alternating current, and the driving module calculates the driving module loss during each switching action according to the loss data;
step S4, driving the motor module to output torque and calculating the loss value of the motor according to the three-phase current output by the driving module;
step S5, the current sensor module feeds back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction, if so, the feedback control is carried out to improve the accuracy of the output torque of the motor module;
and step S6, obtaining an overall efficiency contour map of the electric drive system through an Amesim software post-processing calculation program according to the loss data of the drive module and the drive motor module.
Further, in an embodiment of the present invention, in step S1, the rack module is configured to provide a rotation speed to the motor according to the vehicle rotation speed instruction;
and the torque instruction module is used for transmitting a torque instruction to the control strategy module 1 according to the requirement of the whole vehicle.
Further, in an embodiment of the invention, the rack module determines a relationship between the output rotating speed time of the motor and the rotating speed according to the operating condition of the electric drive system, wherein the relationship is a one-dimensional table of the time and the rotating speed;
the torque instruction module determines the relationship between the torque output time and the torque of the motor according to the operation condition of the electric drive system, and the relationship is a one-dimensional table of the time and the torque.
Further, in an embodiment of the present invention, in the step S1, the control strategy module 1 is configured to convert the torque command into a PWM signal according to the torque command, the rotation speed command, and the maximum torque limiting factor, and provide the PWM signal to the driving module, wherein to ensure synchronization with the actual application strategy, the actual application control strategy is converted into an Amesim callable model for control, the torque command is converted into a corresponding Id and Iq command according to the control strategy, the Id and Iq commands calculate corresponding Ud and Uq, and then the Ud and Uq are converted into PWM signals of Ua, Ub, and Uc according to two-phase to three-phase.
Further, in an embodiment of the present invention, in the step S1, the driving module is configured to perform a switching operation according to the PWM signal of the motor controller, that is, convert the direct current into a three-phase alternating current, wherein in order to accurately calculate the loss of the driving module, the loss data and the characteristic data of the driving module are introduced into the driving module.
Further, in an embodiment of the present invention, in the step S3, the driving motor module is configured to output the torque according to the three-phase current of the driving module, wherein in order to ensure high-precision calculation of the motor characteristics and the motor loss, a finite element motor model is introduced for simulation calculation.
Further, in an embodiment of the present invention, in the step S4, the control strategy module 2 is configured to convert the actual three-phase current into the two-phase current and perform feedback control with the current of the torque command, so as to ensure high-precision output of the torque.
Further, in an embodiment of the present invention, in the step S4, the current sensor module is configured to feed back the actual three-phase ac power to the control strategy module 2 for control.
Further, in an embodiment of the present invention, in step S5, the electric drive system further includes a battery module;
the battery module is used as a power source of the electric automobile, provides a high-voltage power supply for a driving motor of the electric automobile, converts direct current into alternating current through the inverter and outputs the alternating current to the driving motor to do work.
The invention provides an electric drive system efficiency calculation system, which comprises:
the sending module instructs the motor to be dragged to start to operate according to the rotating speed of the rack module, and simultaneously instructs the torque instruction module to send to the control strategy module 1;
the control module is used for converting the control strategy into an Amesim-adjustable model according to the actual application, performing internal operation and outputting a PWM signal to the driving module;
the action module is used for performing switching action and outputting three-phase alternating current according to the PWM signal, and the driving module calculates the loss of the driving module during each switching action according to loss data;
the output module is used for driving the motor module to output torque and calculating the loss value of the motor according to the three-phase current output by the driving module;
the feedback module is used for feeding back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction or not, and if the actual output torque is different from the torque instruction, the feedback control is carried out to improve the accuracy of the output torque of the motor module;
and the computing module is used for obtaining an overall efficiency contour map of the electric drive system through an Amesim software post-processing computing program according to the loss data of the driving module and the driving motor module.
The invention solves the problem of simulation prediction of the efficiency of the electric drive system. The method has the following specific beneficial effects:
the invention relates to an efficiency calculation method of an electric drive system, which provides a method for simulating and predicting the efficiency of the electric drive system by establishing an electric drive system simulation model in Amesim software.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a diagram of an efficiency calculation simulation model of an electric drive system according to an embodiment.
FIG. 2 is a torque block diagram of an electric drive system according to an embodiment.
FIG. 3 is a block diagram of an electric drive system skid according to an embodiment.
Fig. 4 is a diagram of a battery module according to an embodiment.
FIG. 5 is a diagram of a drive module according to an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The electric drive system efficiency calculation method in the embodiment comprises the following steps:
step S1, according to the rotating speed of the rack module, the motor is instructed to be dragged to start to operate, and simultaneously, the instruction of the torque instruction module is sent to the control strategy module 1;
step S2, converting the control strategy into an Amesim callable model according to the actual application, and outputting a PWM signal to a driving module after internal operation;
step S3, the driving module performs switching action according to the PWM signal and outputs three-phase alternating current, and the driving module calculates the driving module loss during each switching action according to the loss data;
step S4, driving the motor module to output torque and calculating the loss value of the motor according to the three-phase current output by the driving module;
step S5, the current sensor module feeds back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction, if so, the feedback control is carried out to improve the accuracy of the output torque of the motor module;
and step S6, obtaining an overall efficiency contour map of the electric drive system through an Amesim software post-processing calculation program according to the loss data of the drive module and the drive motor module.
In this embodiment, in step S1, the rack module is configured to provide a rotation speed for the motor according to a vehicle rotation speed instruction;
and the torque instruction module is used for transmitting a torque instruction to the control strategy module 1 according to the requirement of the whole vehicle.
In the embodiment, the rack module determines the relationship between the output rotating speed time of the motor and the rotating speed according to the operating condition of the electric drive system, wherein the relationship is a one-dimensional table of the time and the rotating speed;
the torque instruction module determines the relationship between the torque output time and the torque of the motor according to the operation condition of the electric drive system, and the relationship is a one-dimensional table of the time and the torque.
In this embodiment, in step S1, the control strategy module 1 is configured to convert the torque command into a PWM signal according to the torque command, the rotation speed command, and the maximum torque limiting factor, and provide the PWM signal to the driving module, wherein to ensure synchronization with the actual application strategy, the actual application control strategy is converted into an Amesim-callable model for control, the torque command is converted into a corresponding Id and Iq command according to the control strategy, corresponding Ud and Uq are calculated from the Id and Iq commands, and then the Ud and Uq are converted into PWM signals of Ua, Ub, and Uc according to two-phase to three-phase.
In this embodiment, in step S1, the driving module is configured to perform a switching operation according to the PWM signal of the motor controller, that is, convert the dc power into a three-phase ac power, wherein loss data and characteristic data of the driving module are introduced into the driving module in order to accurately calculate the loss of the driving module.
In this embodiment, in step S3, the driving motor module is configured to output a torque according to the three-phase current of the driving module, wherein a finite element motor model is introduced for simulation calculation in order to ensure high-precision calculation of the motor characteristics and the motor loss.
In the present embodiment, in step S4, the control strategy module 2 is configured to convert the actual three-phase current into the two-phase current and perform feedback control with the torque command current, thereby ensuring a higher precision output than the torque.
In this embodiment, in step S4, the current sensor module is used to feed back the actual three-phase ac power to the control strategy module 2 for control.
In this embodiment, in step S5, the electric drive system further includes a battery module;
the battery module is used as a power source of the electric automobile, provides a high-voltage power supply for a driving motor of the electric automobile, converts direct current into alternating current through the inverter and outputs the alternating current to the driving motor to do work.
An electric drive system efficiency calculation system of this embodiment, the system includes:
the sending module instructs the motor to be dragged to start to operate according to the rotating speed of the rack module, and simultaneously instructs the torque instruction module to send to the control strategy module 1;
the control module is used for converting the control strategy into an Amesim-adjustable model according to the actual application, performing internal operation and outputting a PWM signal to the driving module;
the action module is used for performing switching action and outputting three-phase alternating current according to the PWM signal, and the driving module calculates the loss of the driving module during each switching action according to loss data;
the output module is used for driving the motor module to output torque and calculating the loss value of the motor according to the three-phase current output by the driving module;
the feedback module is used for feeding back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction or not, and if the actual output torque is different from the torque instruction, the feedback control is carried out to improve the accuracy of the output torque of the motor module;
and the computing module is used for obtaining an overall efficiency contour map of the electric drive system through an Amesim software post-processing computing program according to the loss data of the driving module and the driving motor module.
The embodiment is based on the electric drive system efficiency calculation method, and provides an actual embodiment by combining specific objects:
as shown in fig. 1, the system comprises a power battery module, a torque instruction module, a motor control module 1, a driving module, a driving motor module, a rack module, a current sensor module and a motor control strategy module 2.
In the power battery module: the power battery is used as a power source of the electric automobile, provides a high-voltage power supply for a driving motor of the electric automobile, converts direct current into alternating current through the inverter, and outputs the alternating current to the driving motor to do work.
In the torque module: transmitting the torque instruction to the motor control module according to the requirement of the whole vehicle
In the motor control module 1: converting a torque instruction into a PWM signal according to factors such as a torque instruction, a rotating speed instruction, maximum torque limitation and the like, and providing the PWM signal for a driving module, wherein in order to ensure synchronization with an actual application strategy, an actual application control strategy is converted into an Amesim callable model for control, the torque instruction is converted into corresponding Id and Iq instructions according to the control strategy, and corresponding Ud and Uq are calculated according to the Id and Iq instructions;
then the signals are converted into PWM signals of Ua, Ub and Uc by Ud and Uq according to two-phase to three-phase signals;
in the drive module-04: switching is carried out according to a PWM signal of the motor controller, namely, direct current is converted into three-phase alternating current, wherein loss data and characteristic data of the module are led into the driving module in order to accurately calculate the loss of the driving module.
In the drive motor module: and outputting torque according to the three-phase current of the driving module, wherein a finite element motor model is introduced for ensuring the motor characteristics and the motor loss to carry out simulation calculation.
In the rack module: and providing the specified rotating speed for the motor according to the rotating speed instruction of the whole vehicle.
A current sensor: and feeding the actual three-phase alternating current back to the control strategy module 2 for control.
A control strategy module: the actual three-phase current is converted into two-phase current and feedback control is carried out on the two-phase current and the current of the torque instruction, and high-precision output of torque is guaranteed.
The embodiment is based on the calculation method for the efficiency of the electric drive system, and provides an actual embodiment by combining specific objects:
1) setting the operation condition of the electric drive system:
a) as shown in FIG. 2, the relationship between the torque output time and the torque of the motor is determined according to the operation condition of the electric drive system, and the relationship is a one-dimensional table of the time and the torque.
b) As shown in FIG. 3, the relationship between the output speed and the output speed of the motor is determined according to the operation condition of the electric drive system, and the relationship is a one-dimensional table of the time and the rotation speed.
c) Setting the battery module: as shown in fig. 4, basic battery parameters are set in the battery module.
d) Setting a driving module: as shown in fig. 5, the middle key parameter of the driving module is set.
e) A motor module: and importing the established finite element motor model, wherein the finite element motor model comprises key data such as motor characteristics, motor loss data and the like.
f) A control strategy module: a converted motor control strategy module is introduced, which contains the control strategy, max/min torque.
g) And importing a written Amesim software later-stage calculation efficiency formula.
2) The electric drive system efficiency calculation model operates:
under the current voltage condition, the motor is dragged to start to operate according to the rotating speed instruction of the rack module, and meanwhile, the torque module instruction is sent to the control strategy module 1 to carry out internal operation and then output PWM signals to the driving module. And the driving module performs switching action according to the PWM signal and outputs 3-phase alternating current and simultaneously the driving module calculates the driving module loss during each switching action according to the loss data. And according to the output torque of the 3-phase current motor module output by the driving module, calculating the loss value of the motor. Meanwhile, the current sensor feeds back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction or not, and if the actual output torque is different from the torque instruction, feedback control is carried out to improve the accuracy of the output torque of the motor module.
3) Calculating the efficiency of an electric drive system:
the driving module and the loss data of the motor module of the electric drive system under the current operating condition are obtained through the operation, and the contour map of the overall efficiency of the electric drive system can be obtained through a software Amesim software post-processing calculation program.
The method and the system for calculating the efficiency of the electric drive system provided by the invention are described in detail, specific examples are applied in the method for explaining the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An electric drive system efficiency calculation method is characterized by comprising the following steps:
step S1, according to the rotating speed of the rack module, the motor is instructed to be dragged to start to operate, and simultaneously, the instruction of the torque instruction module is sent to the control strategy module 1;
step S2, converting the control strategy into an Amesim callable model according to the actual application, and outputting a PWM signal to a driving module after internal operation;
step S3, the driving module performs switching action according to the PWM signal and outputs three-phase alternating current, and the driving module calculates the driving module loss during each switching action according to the loss data;
step S4, driving the motor module to output torque and calculating the loss value of the motor according to the three-phase current output by the driving module;
step S5, the current sensor module feeds back the current actual current to the control strategy module 2 to confirm whether the actual output torque is different from the torque instruction, if so, the feedback control is carried out to improve the accuracy of the output torque of the motor module;
and step S6, obtaining an overall efficiency contour map of the electric drive system through an Amesim software post-processing calculation program according to the loss data of the drive module and the drive motor module.
2. The method as claimed in claim 1, wherein in step S1, the gantry module is configured to provide a rotational speed to the motor according to the vehicle rotational speed command;
and the torque instruction module is used for transmitting a torque instruction to the control strategy module 1 according to the requirement of the whole vehicle.
3. The method for calculating the efficiency of the electric drive system according to claim 2, wherein the rack module determines the relationship between the rotating speed output time and the rotating speed of the motor according to the operating condition of the electric drive system, and the relationship is a one-dimensional table of the time and the rotating speed;
the torque instruction module determines the relationship between the torque output time and the torque of the motor according to the operation condition of the electric drive system, and the relationship is a one-dimensional table of the time and the torque.
4. The method for calculating efficiency of an electric drive system according to claim 1, wherein in step S1, the control strategy module 1 is configured to convert the torque command into the PWM signal according to the torque command, the rotational speed command and the maximum torque limiting factor, and provide the PWM signal to the drive module, wherein to ensure synchronization with the actual application strategy, the actual application control strategy is converted into an Amesim callable model for control, the torque command is converted into the corresponding Id and Iq commands according to the control strategy, the corresponding Ud and Uq are calculated from the Id and Iq commands, and then the Ud and Uq are converted into the PWM signal of Ua, Ub and Uc according to two-phase to three-phase.
5. The method of claim 1, wherein in step S1, the driving module is configured to perform a switching operation to convert dc power to three-phase ac power according to the PWM signal of the motor controller, wherein the loss data and the characteristic data of the driving module are introduced into the driving module for accurate calculation of the loss of the driving module.
6. The method as claimed in claim 1, wherein in step S3, the driving motor module is configured to output torque according to three-phase current of the driving module, wherein a finite element motor model is introduced for simulation calculation to ensure high accuracy of motor characteristics and motor losses.
7. The method for calculating efficiency of an electric drive system as claimed in claim 1, wherein in step S4, the control strategy module 2 is used for converting the actual three-phase current into the two-phase current and performing feedback control with the torque command current, which ensures high precision output of torque.
8. The method for calculating the efficiency of an electric drive system according to claim 1, wherein in step S4, the current sensor module is used to feed back the actual three-phase ac current to the control strategy module 2 for control.
9. The method of calculating the efficiency of an electric drive system of claim 1, wherein in step S5, the electric drive system further comprises a battery module;
the battery module is used as a power source of the electric automobile, provides a high-voltage power supply for a driving motor of the electric automobile, converts direct current into alternating current through the inverter and outputs the alternating current to the driving motor to do work.
10. An electric drive system efficiency calculation system, the system comprising:
the sending module instructs the motor to be dragged to start to operate according to the rotating speed of the rack module, and simultaneously instructs the torque instruction module to send to the control strategy module 1;
the control module is used for converting the control strategy into an Amesim-adjustable model according to the actual application, performing internal operation and outputting a PWM signal to the driving module;
the action module is used for performing switching action and outputting three-phase alternating current according to the PWM signal, and the driving module calculates the loss of the driving module during each switching action according to loss data;
the output module is used for driving the motor module to output torque and calculating the loss value of the motor according to the three-phase current output by the driving module;
the feedback module is used for feeding back the current actual current to the control strategy module 2 to determine whether the actual output torque is different from the torque instruction or not, and if the actual output torque is different from the torque instruction, the feedback module performs feedback control to improve the accuracy of the output torque of the motor module;
and the computing module can obtain an integral efficiency contour map of the electric drive system through an Amesim software post-processing computing program according to the loss data of the driving module and the driving motor module.
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