CN116026504A - Test method and system of electric drive system, storage medium and electronic equipment - Google Patents
Test method and system of electric drive system, storage medium and electronic equipment Download PDFInfo
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Abstract
The invention discloses a test method and system of an electric drive system, a storage medium and electronic equipment. Wherein the method comprises the following steps: and responding to the dynamic running condition of the electric drive system, and acquiring a working signal of the electric drive system, wherein the working signal comprises the following components: voltage signals, current signals, rotational speed signals and torque signals; integrating the voltage signal and the current signal through a power analyzer to obtain an electric energy integration result, wherein the electric energy integration result comprises: electric power and generated power; and carrying out integral processing on the rotating speed signal and the torque signal through an upper computer system to obtain a mechanical energy integral result, wherein the mechanical energy integral result comprises the following steps: electromechanical energy and power generation mechanical energy; and determining an efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result through the upper computer system. The invention solves the technical problem of lower test accuracy of the test method of the electric drive system in the related technology.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a testing method and system of an electric drive system, a storage medium and electronic equipment.
Background
At present, an electric automobile becomes the development direction of the current automobile industry, and in the research and development process of the electric automobile, the efficiency of an electric drive system needs to be tested. The efficiency test of the electric drive system in the industry is often limited in the aspects of efficiency, highest efficiency, high-efficiency area ratio and the like of constant-speed working conditions, and has larger difference with actual use working conditions of the electric automobile and lower reduction degree of the efficiency of the actual dynamic working conditions.
In order to realize the test and calculation of NEDC (New European Driving Cycle, new European cycle test) and CLTC (China Light Vehicle Test Cycle, chinese light electric vehicle running working condition) working condition efficiency, an offline integration test method is provided in the related art, and the dynamic working condition efficiency of the electric vehicle can be calculated based on the data of the steady state working condition efficiency MAP (Manifold Absolute Pressure, an intake manifold absolute pressure sensor), however, the actual working condition difference with the electric vehicle is larger, the offline test data acquisition precision is influenced by the uploading rate of a power analyzer, the actual energy consumption reduction degree of an electric drive system is still lower, and the test accuracy is lower.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a testing method and system of an electric drive system, a storage medium and electronic equipment, which at least solve the technical problem of lower testing accuracy of the testing method of the electric drive system in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a method for testing an electric drive system, including: and responding to the dynamic running condition of the electric drive system, and acquiring a working signal of the electric drive system, wherein the working signal comprises the following components: voltage signals, current signals, rotational speed signals and torque signals; integrating the voltage signal and the current signal through a power analyzer to obtain an electric energy integration result, wherein the electric energy integration result comprises: electric power and generated power; and carrying out integral processing on the rotating speed signal and the torque signal through an upper computer system to obtain a mechanical energy integral result, wherein the mechanical energy integral result comprises the following steps: electromechanical energy and power generation mechanical energy; and determining an efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result through the upper computer system.
Optionally, performing integration processing on the voltage signal and the current signal to obtain an electric energy integration result includes: responding to the current signal being larger than a first preset value, integrating the voltage signal and the current signal to obtain electric energy; and responding to the fact that the current signal is smaller than or equal to a first preset value, and carrying out integral processing on the voltage signal and the current signal to obtain the generated electric energy.
Optionally, performing integral processing on the rotation speed signal and the torque signal to obtain a mechanical energy integral result, where the mechanical energy integral result includes: responding to the torque signal being larger than a second preset value, carrying out integral processing on the rotating speed signal and the torque signal to obtain electromechanical energy; and responding to the torque signal being smaller than or equal to a second preset value, and carrying out integral processing on the rotating speed signal and the torque signal to obtain the power generation mechanical energy.
Optionally, determining the efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result includes: respectively obtaining the absolute values of the power generation electric energy and the power generation mechanical energy to obtain the absolute values of the electric energy and the mechanical energy; obtaining the sum of an absolute value of electric energy and electromechanical energy to obtain a first sum value; obtaining the sum of the absolute value of mechanical energy and electric energy to obtain a second sum value; and obtaining the ratio of the first sum value to the second sum value to obtain an efficiency test result.
Optionally, in response to the electric drive system being in the dynamic driving condition within the preset time period, determining the efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result includes: acquiring a starting electric energy integration result and a stopping electric energy integration result in the electric energy integration results, wherein the starting electric energy integration result is used for representing the electric energy integration result based on the starting moment of the preset time period, and the stopping electric energy integration result is used for representing the electric energy integration result based on the stopping moment of the preset time period; acquiring an initial mechanical energy integration result and a final mechanical energy integration result in the mechanical energy integration results, wherein the initial mechanical energy integration result is used for representing the mechanical energy integration result based on the initial moment of the preset time period, and the final mechanical energy integration result is used for representing the mechanical energy integration result based on the final moment of the preset time period; obtaining a difference value between a termination electric energy integration result and a starting electric energy integration result to obtain an electric energy difference value; obtaining a difference value between a termination mechanical energy integration result and a starting mechanical energy integration result to obtain a mechanical energy difference value; based on the electrical energy difference and the mechanical energy difference, an efficiency test result is determined.
Optionally, acquiring electric vehicle data of the electric vehicle to be tested; determining preset rotating speeds and preset torques at different moments in a preset time period based on the electric vehicle data and the preset time step; and controlling the electric drive system to be in a dynamic running working condition based on the preset rotating speed and the preset torque through the dynamometer.
Optionally, acquiring the operation signal of the electric drive system includes: collecting a voltage signal through a power analyzer; collecting a current signal through a current sensor; collecting a rotating speed signal through a rotating speed sensor; the torque signal is acquired by a torque sensor.
According to another aspect of the embodiment of the present invention, there is also provided a test system of an electric drive system, including: the power analyzer is connected with the electric drive system and is used for acquiring a voltage signal and a current signal of the electric drive system and carrying out integral processing on the voltage signal and the current signal to obtain an electric energy integral result, and the electric drive system is in a dynamic driving working condition, wherein the electric energy integral result comprises: electric power and generated power; the upper computer system is connected with the electric drive system and the power analyzer and is used for acquiring a rotating speed signal and a torque signal of the electric drive system, carrying out integral processing on the rotating speed signal and the torque signal to obtain a mechanical energy integral result, and determining an efficiency test result of the electric drive system based on the electric energy integral result and the mechanical energy integral result, wherein the electric energy integral result comprises: electric power and generated power.
Optionally, the system further comprises: the dynamometer is connected with the electric drive system and is used for controlling the electric drive system to be in a dynamic running working condition in a preset time period based on preset rotating speeds and preset torques at different moments in the preset time period, wherein the preset rotating speeds and the preset torques are obtained based on electric vehicle data of an electric vehicle to be tested and preset time steps.
Optionally, the system further comprises: and the battery simulator is connected with the electric drive system and is used for supplying power to the electric drive system.
Optionally, the system further comprises: the current sensor is connected with the power analyzer and used for uploading the acquired current signals to the power analyzer; the rotating speed sensor is connected with the upper computer system and used for uploading the acquired rotating speed signal to the upper computer system; the torque sensor is connected with the upper computer system and used for uploading the collected torque signals to the upper computer system; the power analyzer is also used for collecting voltage signals.
According to another aspect of the embodiments of the present invention, there is also provided a computer readable storage medium, including a stored program, where the program when run controls a device in which the computer readable storage medium is located to perform the method in the above embodiments.
According to another aspect of the embodiments of the present invention there is also provided an electronic device comprising a memory in which a computer program is stored and a processor arranged to run the method of the above embodiments of the computer program.
In the embodiment of the invention, an online real-time mode is adopted, and the aim of testing the average efficiency of the electric drive system in online real time is fulfilled by applying the built-in integral function of the power analyzer, so that the real-time performance is good, compared with an offline integral calculation method, the built-in integral function of the power analyzer is applied, the built-in integral function of the power analyzer is not limited by the uploading frequency of voltage and current, the energy change under the dynamic working condition can be highly restored, the comprehensive efficiency of the electric drive system can be more accurately evaluated, the test method does not need to post-process a large amount of measured data, only the technical effect of recording the starting and ending time data of the working condition is needed, and the technical problem that the test accuracy of the test method of the electric drive system in the related technology is lower is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart of a method of testing an electro-drive system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative electric drive system efficiency testing principle architecture according to an embodiment of the present invention;
FIG. 3 is a flow chart of an alternative electric drive system efficiency test in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of a test system of an electro-drive system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to an embodiment of the present invention, there is provided an embodiment of a method of testing an electric drive system, it being noted that the steps shown in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.
Fig. 1 is a flowchart of a testing method of an electric drive system according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102, a working signal of the electric drive system is obtained in response to the electric drive system being in a dynamic driving working condition, wherein the working signal comprises: voltage signal, current signal, rotational speed signal and torque signal.
The electric drive system in the step can be a drive system taking a motor as a power source, and comprises an inverter, a motor and a speed reducer, wherein the electric drive system is usually arranged in an electric automobile and is a core power source of the electric automobile; the dynamic driving working condition may be an actual driving process of the electric automobile, and the working state of the electric driving system may include, but is not limited to: starting, accelerating, constant speed, decelerating, turning, ascending and descending slopes, stopping and other working states; the working signal may be a signal required for efficiency test of the electric drive system, typically, but not limited to, a voltage signal, a current signal, a rotation speed signal and a torque signal, and may be obtained according to actual needs.
In an alternative embodiment, during the efficiency test of the electric driving system, a battery can be simulated by a battery simulator to supply power to the electric driving system, and the actual operation of the electric vehicle is simulated by a dynamometer to drive the electric driving system to operate so as to simulate and realize that the electric driving system is in a dynamic driving condition, and after the electric driving system is in the dynamic driving condition, the working signal of the electric driving system is firstly obtained, where the working signal mainly comprises: voltage signal, current signal, rotational speed signal and torque signal. Alternatively, the working signal may be obtained by: collecting a voltage signal through a power analyzer; collecting a current signal through a current sensor; collecting a rotating speed signal through a rotating speed sensor; the torque signal is acquired by a torque sensor.
Step S104, integrating the voltage signal and the current signal through a power analyzer to obtain an electric energy integration result, wherein the electric energy integration result comprises: electric power and generated power.
The power analyzer in the above steps can be used for measuring parameters such as power, efficiency and the like of power conversion devices such as motors, frequency converters, transformers and the like. The integration process may refer to a process of accumulating the electric energy using a mathematical integration function.
In an alternative embodiment, the power analyzer is internally provided with an integrating function, and after the power analyzer obtains the current signal i and the voltage signal u, the electric power w+ and the generated power W-, that is, the electric power integrating result, can be obtained by calculating by applying the integrating function built in the power analyzer.
Step S106, the rotational speed signal and the torque signal are subjected to integral processing through the upper computer system to obtain a mechanical energy integral result, wherein the mechanical energy integral result comprises the following steps: electromechanical energy and power generation mechanical energy.
The upper computer system in the above steps may be an electronic device having functions of integrating processing, man-machine interaction, data display, etc., and may be a smart phone, a tablet computer, a notebook computer, a personal computer, etc., but is not limited thereto.
In an alternative embodiment, the rotation speed signal n and the torque signal T may be integrated in real time by the upper computer system to obtain the electromechanical energy p+ and the power generation mechanical energy P-, that is, the above-mentioned mechanical energy integration result.
Step S108, determining an efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result through the upper computer system.
The efficiency test result of the electric drive system in the above step may refer to the average efficiency of the electric drive system.
Optionally, determining the efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result includes: respectively obtaining the absolute values of the power generation electric energy and the power generation mechanical energy to obtain the absolute values of the electric energy and the mechanical energy; obtaining the sum of an absolute value of electric energy and electromechanical energy to obtain a first sum value; obtaining the sum of the absolute value of mechanical energy and electric energy to obtain a second sum value; and obtaining the ratio of the first sum value to the second sum value to obtain an efficiency test result.
In an alternative embodiment, after the electric power w+ and the generated power W "are calculated by the power analyzer, the electric power w+ and the generated power W" may be reported to the host computer system, so that the host computer system may substitute the electric power w+, the generated power W-, the electric mechanical energy p+ and the generated mechanical energy P "into the following efficiency calculation formulas to obtain the average efficiency of the electric drive system, that is, the efficiency test result described above:
where η represents the efficiency test result and the function represents the absolute value.
Through the steps, in response to the dynamic running condition of the electric drive system, after the working signal of the electric drive system is obtained, the voltage signal and the current signal in the working signal are subjected to integral processing through the power analyzer to obtain an electric energy integral result, the rotating speed signal and the torque signal in the working signal are subjected to integral processing through the upper computer system to obtain a mechanical energy integral result, and finally the efficiency test result of the electric drive system is determined through the upper computer system based on the electric energy integral result and the mechanical energy integral result, so that the purpose of testing the efficiency of the electric drive system is achieved. It is easy to notice that the efficiency test result is determined based on the electric energy integration result obtained by integrating the power analyzer in real time and the mechanical energy integration result obtained by integrating the upper computer system in real time, and the purpose of testing the average efficiency of the electric drive system in real time on line is achieved by applying the built-in integration function of the power analyzer in an on-line real-time mode, so that the energy change under the dynamic working condition with good instantaneity and high reduction is realized, the technical effect of evaluating the comprehensive efficiency of the electric drive system can be more accurately achieved, and the technical problem of lower test accuracy of the test method of the electric drive system in the related technology is solved.
Optionally, performing integration processing on the voltage signal and the current signal to obtain an electric energy integration result includes: responding to the current signal being larger than a first preset value, integrating the voltage signal and the current signal to obtain electric energy; and responding to the fact that the current signal is smaller than or equal to a first preset value, and carrying out integral processing on the voltage signal and the current signal to obtain the generated electric energy.
The first preset value in the above step may be a preset current signal for determining whether the electric power is obtained by integration or generated power, and the first preset value may be manually set according to practical situations, and in an alternative embodiment, the value of the first preset value may be 0, but is not limited thereto.
In an alternative embodiment, the power analyzer judges the magnitude of the current signal i after collecting the voltage signal u and receiving the current signal i collected by the current sensor, and when i >0, the power analyzer calculates the electric energy W+ by using a built-in integral function; when i <0 or i=0, calculating the generated electric energy W-by using a built-in integral function; for example, when the current signal i is 2, since i= 2>0, the power analyzer calculates the electric power w+ with the built-in integration function; when the current signal is-1, the power analyzer calculates the generated electric energy W-using the built-in integration function because i= -1<0.
Optionally, performing integral processing on the rotation speed signal and the torque signal to obtain a mechanical energy integral result, where the mechanical energy integral result includes: responding to the torque signal being larger than a second preset value, carrying out integral processing on the rotating speed signal and the torque signal to obtain electromechanical energy; and responding to the torque signal being smaller than or equal to a second preset value, and carrying out integral processing on the rotating speed signal and the torque signal to obtain the power generation mechanical energy.
The second preset value in the above step may be a preset torque signal value for determining whether the electromechanical energy or the power generation mechanical energy is obtained through integration, and the first preset value may be manually set according to practical situations, and in an alternative embodiment, the value of the first preset value may be 0, but is not limited thereto.
In an alternative embodiment, the upper computer system judges the magnitude of the torque signal value T after receiving the rotating speed signal n acquired by the rotating speed sensor and the torque signal value T acquired by the torque sensor, and when T >0, the upper computer system calculates the electromechanical energy P+ by real-time integration; when T <0 or T=0, calculating the power generation mechanical energy P-by real-time integration; for example, when the torque signal value T is 2, because t= 2>0, the upper computer system integrates and calculates the electromechanical energy p+ in real time; when the torque signal value T is-1, the upper computer system integrates and calculates the power generation mechanical energy P-in real time because T= -1<0.
Optionally, in response to the electric drive system being in the dynamic driving condition within the preset time period, determining the efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result includes: acquiring a starting electric energy integration result and a stopping electric energy integration result in the electric energy integration results, wherein the starting electric energy integration result is used for representing the electric energy integration result based on the starting moment of the preset time period, and the stopping electric energy integration result is used for representing the electric energy integration result based on the stopping moment of the preset time period; acquiring an initial mechanical energy integration result and a final mechanical energy integration result in the mechanical energy integration results, wherein the initial mechanical energy integration result is used for representing the mechanical energy integration result based on the initial moment of the preset time period, and the final mechanical energy integration result is used for representing the mechanical energy integration result based on the final moment of the preset time period; obtaining a difference value between a termination electric energy integration result and a starting electric energy integration result to obtain an electric energy difference value; obtaining a difference value between a termination mechanical energy integration result and a starting mechanical energy integration result to obtain a mechanical energy difference value; based on the electrical energy difference and the mechanical energy difference, an efficiency test result is determined.
The preset time period in the above steps refers to a time period corresponding to the efficiency test of the electric drive system, and includes a start time and an end time. Since the start of each test is not necessarily from 0, it is necessary to record start data and end data of a preset time period, where the start data may be a voltage signal u acquired by the power analyzer at a start time, a current signal i acquired by the current sensor, a rotational speed signal n acquired by the rotational speed sensor, and a torque signal T acquired by the torque sensor; the end data can be a voltage signal u acquired by the power analyzer at the end time, a current signal i acquired by a current sensor, a rotating speed signal n acquired by a rotating speed sensor, and a torque signal T acquired by a torque sensor; and obtaining an electric energy difference value and a mechanical energy difference value based on the electric energy and the mechanical energy values at the starting time and the ending time, and determining an efficiency test result.
In an alternative embodiment of the present invention,
where η represents the efficiency test result and the function represents the absolute value.
Optionally, acquiring electric vehicle data of the electric vehicle to be tested; determining preset rotating speeds and preset torques at different moments in a preset time period based on the electric vehicle data and the preset time step; and controlling the electric drive system to be in a dynamic running working condition based on the preset rotating speed and the preset torque through the dynamometer.
The electric vehicle data in the above steps may include, but is not limited to: the parameters of the running resistance curve, the preparation quality, the tire rolling radius and the maximum speed of the whole vehicle. The whole vehicle running resistance curve can be a resistance value which is born in the whole running process of the electric vehicle and comprises rolling resistance, acceleration resistance, gradient resistance and air resistance; the preparation quality can be the quality of the automobile in a complete state according to the technical conditions of delivery, such as spare tire, tool and the like; the tire rolling radius can be an equivalent radius used for calculation when the wheel rolls, and the circumferential length used for calculation is equal to the actual rolling distance of the wheel; the highest speed can be the highest running speed which can be achieved by the automobile on a road surface with good level, concrete or asphalt, and is the speed when the running resistance and the driving force of the automobile are balanced under the condition that the flat road surface is windless; the preset rotating speed and the preset torque can be values of the rotating speed and the torque which simulate the electric drive system to be in a dynamic running working condition based on the electric vehicle data and the preset time step.
A preferred embodiment of the present invention will be described in detail with reference to fig. 2 and 3. As shown in fig. 2, the architecture includes: the power analyzer is connected with the inverter of the electric drive system, and the rack upper computer system is connected with the speed reducer of the electric drive system and the power analyzer. In the efficiency test process of the electric drive system, the battery simulator supplies power to the electric drive system, a voltage signal u of electric energy of the electric drive system is directly collected by the power analyzer, a current signal i is collected by the current sensor and is uploaded to the power analyzer, a built-in integration function of the power analyzer is used for integrating current and voltage data in real time, when i >0, electric energy W+ can be obtained through integration, … can be obtained through integration, and then the integrated electric energy W+ and the integrated electric energy W-are uploaded to the rack upper computer system. The rotating speed signal n of the mechanical energy of the electric drive system is collected by a rotating speed sensor and uploaded to a rack upper computer system, the torque signal T is collected by a torque sensor and uploaded to the rack upper computer system, the rack upper computer system is used for integrating the rotating speed and the torque data in real time, and finally, the rack upper computer system uploads the power generation electric energy W-, the electric energy W+ and the power generation mechanical energy P-, and the electric mechanical energy P+ of the electric drive system to a screen display desktop in real time ….
As shown in fig. 3, the efficiency testing process of the electric drive system includes the following steps: and step 1, acquiring parameters of a whole vehicle running resistance curve, a preparation quality, a tire rolling radius and a highest vehicle speed, and acquiring an electric drive rotating speed and torque at each time point in a NEDC or CLTC running working condition according to the NEDC or CLTC running working condition and a preset time step. And 2, recording starting data, starting an integral function built in the power analyzer and an integral function of a system of a rack upper computer, and running dynamic running working conditions such as NEDC, CLTC and the like. And 3, recording data of the generated electric energy W-, the electric energy W+, the generated mechanical energy P and the electric mechanical energy P+ after integration by the power analyzer and the rack upper computer system. And 4, recording termination data, and stopping the built-in integration function of the power analyzer and the integration function of the upper computer system of the rack. And 5, calculating the efficiency of the data obtained in the steps 3 and 4 to obtain the average efficiency of the electric drive system.
By the technical scheme, the electric energy integral and the mechanical energy integral of the electric drive system under the electric and power generation working conditions can be tested on line in real time, so that the average efficiency of the electric drive system is obtained, the real-time performance is good, the actual use working conditions of the vehicle are applied, and the actual energy consumption of the electric drive system is highly restored; compared with an offline integral calculation method, the method has the advantages that the built-in integral function of the power analyzer is applied, the method is not limited by the uploading frequency of voltage and current, the energy change under the dynamic working condition can be restored to a high degree, the comprehensive efficiency of the electric drive system can be evaluated more accurately, the post-processing of a large amount of test data is not needed, any complicated modeling link, programming tool and test data post-processing link are not needed, only the starting and ending time data of the working condition are needed to be recorded, the operation is simple, and the dynamic working condition efficiency test of the electric drive system is only needed to be completed accurately in real time by an upper computer system of an electric drive system rack and the power analyzer; the system efficiency of the dynamic working conditions of the electric drive systems of all electric vehicles can be rapidly tested and compared, so that the system efficiency of a certain set of electric drive systems can be evaluated, and a whole vehicle factory is guided to select the electric drive systems.
Example 2
According to another aspect of the embodiment of the present invention, a test system of an electric drive system is provided, where the test method of the electric drive system provided in the foregoing embodiment 1 may be executed, and a specific implementation process and an application scenario are the same as those of the foregoing embodiment 1, and are not described herein.
FIG. 4 is a schematic diagram of a test system of an electro-drive system, as shown in FIG. 4, according to an embodiment of the present invention, the system comprising:
the power analyzer 40 is connected to the electric driving system 20, and is configured to obtain a voltage signal and a current signal of the electric driving system, and perform integration processing on the voltage signal and the current signal to obtain an electric energy integration result, where the electric driving system is in a dynamic driving condition, and the electric energy integration result includes: electric power and generated power; the upper computer system 60 is connected with the electric drive system and the power analyzer, and is configured to obtain a rotational speed signal and a torque signal of the electric drive system, perform integration processing on the rotational speed signal and the torque signal to obtain a mechanical energy integration result, and determine an efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result, where the electric energy integration result includes: electric power and generated power.
The power analyzer in the above steps can be mainly used for measuring parameters such as power, efficiency and the like of power conversion devices such as motors, frequency converters, transformers and the like; the upper computer system can be a computer which can directly send out a control command and display various signal changes on a screen; the working signal of the electric drive system can be obtained by the following modes: collecting a current signal by using a current sensor, uploading the current signal to a power analyzer, directly collecting a voltage signal by using the power analyzer, collecting a rotating speed signal by using a rotating speed sensor, and collecting a torque signal by using a torque sensor; the integration processing is an operation rule using a mathematically indefinite integration.
Optionally, the dynamometer is connected with the electric driving system and is used for controlling the electric driving system to be in a dynamic driving working condition in a preset time period based on preset rotating speeds and preset torques at different moments in the preset time period, wherein the preset rotating speeds and the preset torques are obtained based on electric vehicle data of the electric vehicle to be tested and preset time steps.
The dynamometer in the step can simulate the actual running of the electric automobile and drive the electric drive system to run so as to simulate the dynamic running condition of the electric drive system; the preset time period is a time period corresponding to the working condition efficiency of the electric drive system to be tested, and is represented by starting time and ending time; the preset rotating speed and the preset torque refer to rotating speed and torque values which simulate the electric vehicle under the dynamic working condition based on the electric vehicle data and the preset time step.
Optionally, a battery simulator is connected with the electric drive system and is used for supplying power to the electric drive system.
The battery simulator in the steps can be a metering instrument used in the field of traffic engineering, can simulate the dynamic characteristics of the vehicle battery of the electric vehicle, is used for supplying power for a bench test of a driving battery system, has good voltage and current response speed, and is suitable for testing the dynamic characteristics of a motor system for a vehicle.
Optionally, the system further comprises: the current sensor is connected with the power analyzer and used for uploading the acquired current signals to the power analyzer; the rotating speed sensor is connected with the upper computer system and used for uploading the acquired rotating speed signal to the upper computer system; the torque sensor is connected with the upper computer system and used for uploading the collected torque signals to the upper computer system; the power analyzer is also used for collecting voltage signals.
The power analyzer in the above steps can be mainly used for measuring parameters such as power, efficiency and the like of power conversion devices such as motors, frequency converters, transformers and the like; the upper computer system can be a computer which can directly send out a control command and display various signal changes on a screen; the current sensor can be a detection device, can sense the information of the detected current, and can convert the information sensed by detection into an electric signal or other information output in a required form which meets the requirement of a certain standard according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like; the rotating speed sensor can be a sensor for converting the rotating speed of a rotating object into electric quantity output, belongs to an indirect measuring device, can be manufactured by mechanical, electric, magnetic, optical, hybrid methods and the like, and can be divided into an analog type and a digital type according to different signal forms; the torque sensor, also known as a torque sensor, may be a detection of the perception of a torsional moment on various rotating or non-rotating mechanical components, which converts the physical change of torque into an accurate electrical signal.
Example 3
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, including a stored program, where the program, when run, controls a device in which the computer-readable storage medium is located to perform the above method.
The computer storage medium in the above steps may be a medium for storing a certain discrete physical quantity in a computer memory, and the computer storage medium mainly includes a semiconductor, a magnetic core, a magnetic drum, a magnetic tape, a laser disk, and the like. The computer readable storage medium may include a stored program which may be a set of instructions which can be recognized and executed by a computer, running on an electronic computer, and which may be an informative tool for meeting certain needs of a person.
Example 4
According to another aspect of an embodiment of the invention there is also provided an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the above method of the computer program.
The memory in the above steps may be a kind of sequential logic circuit, and is used for storing memory components such as data and instructions, and is mainly used for storing programs and data; a processor may be a functional unit that interprets and executes instructions, and has a unique set of operating commands, which may be referred to as the processor's instruction set, as memory, call-in, etc.; the memory stores a computer program, which may be a set of instructions that can be recognized and executed by a computer, running on an electronic computer, and an informatization tool that meets certain needs of people.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of units may be a logic function division, and there may be another division manner in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method of the various embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method for testing an electro-mechanical system, comprising:
acquiring a working signal of an electric drive system in response to the electric drive system being in a dynamic driving working condition, wherein the working signal comprises: voltage signals, current signals, rotational speed signals and torque signals;
and integrating the voltage signal and the current signal through a power analyzer to obtain an electric energy integration result, wherein the electric energy integration result comprises: electric power and generated power;
and integrating the rotating speed signal and the torque signal through an upper computer system to obtain a mechanical energy integration result, wherein the mechanical energy integration result comprises: electromechanical energy and power generation mechanical energy;
and determining an efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result through the upper computer system.
2. The method of claim 1, wherein integrating the voltage signal and the current signal to obtain an electrical energy integration result comprises:
responding to the current signal being larger than a first preset value, carrying out integral processing on the voltage signal and the current signal to obtain the electric energy;
and responding to the current signal being smaller than or equal to the first preset value, and carrying out integral processing on the voltage signal and the current signal to obtain the generated electric energy.
3. The method of claim 1, wherein integrating the rotational speed signal and the torque signal to obtain a mechanical energy integration result comprises:
responding to the torque signal being larger than a second preset value, carrying out integral processing on the rotating speed signal and the torque signal to obtain the electromechanical energy;
and responding to the torque signal being smaller than or equal to the second preset value, and carrying out integral processing on the rotating speed signal and the torque signal to obtain the power generation mechanical energy.
4. The method of claim 1, wherein determining an efficiency test result for the electric drive system based on the electrical energy integration result and the mechanical energy integration result comprises:
respectively obtaining absolute values of the power generation electric energy and the power generation mechanical energy to obtain an electric energy absolute value and a mechanical energy absolute value;
obtaining the sum of the absolute value of the electric energy and the electromechanical energy to obtain a first sum value;
obtaining the sum of the absolute value of the mechanical energy and the electric energy to obtain a second sum value;
and obtaining the ratio of the first sum value to the second sum value to obtain the efficiency test result.
5. The method of claim 4, wherein determining an efficiency test result of the electric drive system based on the electric energy integration result and the mechanical energy integration result in response to the electric drive system both being in the dynamic travel condition for a preset period of time comprises:
acquiring a starting electric energy integration result and a stopping electric energy integration result in the electric energy integration results, wherein the starting electric energy integration result is used for representing an electric energy integration result based on the starting moment of the preset time period, and the stopping electric energy integration result is used for representing an electric energy integration result based on the stopping moment of the preset time period;
acquiring a starting mechanical energy integration result and a stopping mechanical energy integration result in the mechanical energy integration results, wherein the starting mechanical energy integration result is used for representing a mechanical energy integration result based on the starting moment of the preset time period, and the stopping mechanical energy integration result is used for representing a mechanical energy integration result based on the stopping moment of the preset time period;
obtaining a difference value between the ending electric energy integration result and the starting electric energy integration result to obtain an electric energy difference value;
obtaining a difference value between the ending mechanical energy integration result and the starting mechanical energy integration result to obtain a mechanical energy difference value;
and determining the efficiency test result based on the electric energy difference value and the mechanical energy difference value.
6. The method of claim 5, wherein the method further comprises:
acquiring electric vehicle data of an electric vehicle to be tested;
determining preset rotating speeds and preset torques at different moments in the preset time period based on the electric vehicle data and the preset time step;
and controlling the electric drive system to be in the dynamic running working condition through the dynamometer based on the preset rotating speed and the preset torque.
7. A test system for an electro-mechanical system, comprising:
the power analyzer is connected with the electric drive system, and is used for acquiring a voltage signal and a current signal of the electric drive system, and carrying out integration processing on the voltage signal and the current signal to obtain an electric energy integration result, wherein the electric drive system is in a dynamic driving working condition, and the electric energy integration result comprises: electric power and generated power;
the upper computer system is connected with the electric drive system and the power analyzer and is used for acquiring a rotating speed signal and a torque signal of the electric drive system, carrying out integral processing on the rotating speed signal and the torque signal to obtain a mechanical energy integral result, and determining an efficiency test result of the electric drive system based on the electric energy integral result and the mechanical energy integral result, wherein the electric energy integral result comprises: electric power and generated power.
8. The system of claim 7, wherein the system further comprises:
the dynamometer is connected with the electric drive system and used for controlling the electric drive system to be in the dynamic running working condition in the preset time period based on preset rotating speeds and preset torques at different moments in the preset time period, wherein the preset rotating speeds and the preset torques are obtained based on electric vehicle data of an electric vehicle to be tested and preset time steps.
9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to perform the method according to any one of claims 1 to 6.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of any of claims 1 to 6.
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