Control method of electric vehicle drive system, medium and electric vehicle

Abstract

The present invention discloses a control method, medium, and electric vehicle for an electric vehicle drive system. The control method comprises: obtaining a tone that can be produced by the drive system when heating the electric vehicle's power battery, recording it as a target tone; determining a target melody based on the target tone, and generating a first control instruction based on the target melody; and controlling the drive system to heat the power battery based on the first control instruction so that the drive system plays the target melody. This control method can convert the high-frequency noise generated by the drive system during rapid heating control into a melody, thereby significantly improving the driving experience of the vehicle during rapid heating of the power battery.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a control method, a medium and an electric vehicle for an electric vehicle drive system. Background Art

[0002] Single-module power battery rapid heating control is widely adopted by major pure electric vehicle manufacturers both domestically and internationally, but the high-frequency noise associated with this technology remains a persistent issue. Pure electric vehicle power batteries have specific requirements for the frequency of the charge and discharge currents during rapid heating. Excessively low charge and discharge current frequencies can lead to lithium deposition in the power battery during rapid heating, causing irreversible damage. Generally speaking, higher current frequencies increase the threshold for lithium deposition, meaning the system must allow a higher charge and discharge current. While increasing the frequency and amplitude of the charge and discharge currents can improve the power battery's heating rate, excessively high current frequencies can introduce high-frequency noise into the drive system, severely impacting the vehicle's ride quality. The generation of high-frequency noise during rapid heating control is directly related to the principle of rapid heating technology. Reducing the heating current frequency and amplitude can mitigate this noise issue, but this reduces heating speed and efficiency. Currently, no mature and effective solution exists within the industry. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, one object of the present invention is to provide a control method, medium, and electric vehicle for an electric vehicle drive system that can convert high-frequency noise generated by the drive system during rapid heating control into music, thereby significantly improving the driving experience of the vehicle during rapid heating of the power battery.

[0004] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a control method for an electric vehicle drive system, the method comprising: obtaining a tone that can be generated by the drive system when heating the power battery of the electric vehicle, recorded as a target tone; determining a target music according to the target tone, and generating a first control instruction according to the target music; controlling the drive system to heat the power battery according to the first control instruction so that the drive system plays the target music.

[0005] In addition, the control method of the electric vehicle drive system proposed in the above embodiment of the present invention may also have the following additional technical features:

[0006] According to one embodiment of the present invention, obtaining the tone that can be generated when the drive system heats the power battery of the electric vehicle includes: determining a tone to be screened; determining a second control instruction based on the frequency corresponding to the tone to be screened and the heating strategy of the drive system for the power battery; and controlling the drive system to heat the power battery according to the second control instruction to obtain the target tone.

[0007] According to one embodiment of the present invention, the second control instruction includes a d-axis voltage instruction and a q-axis voltage instruction, wherein the d-axis voltage instruction is calculated based on the frequency and amplitude coefficient corresponding to the tone to be filtered, and the q-axis voltage instruction is set to 0.

[0008] According to one embodiment of the present invention, controlling the drive system to heat the power battery according to the second control instruction includes: initializing the amplitude coefficient, and controlling the drive system to heat the power battery according to the second control instruction corresponding to the initial value of the amplitude coefficient; obtaining the current value of the drive system, and determining whether the current value is greater than a current threshold; if not, increasing the current amplitude coefficient, and controlling the drive system to heat the power battery according to the second control instruction corresponding to the current amplitude coefficient, and returning to the step of obtaining the current value of the drive system; if so, recording the last amplitude coefficient as the target amplitude coefficient; wherein, when controlling the drive system to heat the power battery according to the second control instruction corresponding to the target amplitude coefficient, the tone generated by the drive system is the target tone.

[0009] According to an embodiment of the present invention, before determining the target music according to the target pitch, the method further includes: screening the target pitch.

[0010] According to an embodiment of the present invention, determining the target music according to the target pitch includes: acquiring a note corresponding to the target pitch, and determining the target music according to the note.

[0011] According to one embodiment of the present invention, generating the first control instruction based on the target music includes: obtaining the note sequence of the target music and the duration of each note in the note sequence; generating the first control instruction based on the note sequence and the duration of each note in the note sequence.

[0012] According to one embodiment of the present invention, generating the first control instruction based on the note sequence and the duration of each note in the note sequence includes: obtaining a control instruction corresponding to the i-th note in the note sequence, wherein the control instruction corresponding to the i-th note includes a d-axis voltage instruction corresponding to the i-th note and a q-axis voltage instruction corresponding to the i-th note, the d-axis voltage instruction corresponding to the i-th note is calculated based on the frequency corresponding to the tone corresponding to the i-th note and the target amplitude coefficient corresponding to the tone corresponding to the i-th note, the q-axis voltage instruction corresponding to the i-th note is set to 0, and i is a positive integer; obtaining the first control instruction based on the control instructions corresponding to each note in the note sequence.

[0013] The control method of the electric vehicle drive system in an embodiment of the present invention first obtains the tone that can be generated when the power battery is heated, determines a melody based on the tone that can be generated by the power battery, and generates a control instruction based on the melody to control the drive system to play the melody. The control method of the electric vehicle drive system converts the high-frequency noise generated by the drive system during the rapid heating control process into music, thereby greatly improving the driving experience of the vehicle during the rapid heating of the power battery.

[0014] To achieve the above-mentioned purpose, a second embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the control method of the drive system as described above is implemented.

[0015] To achieve the above-mentioned objectives, the third aspect of the present invention proposes an electric vehicle, comprising: a drive system and a controller, the controller comprising a memory and a processor, the memory storing a computer program, and when the computer program is executed by the processor, the control method of the electric vehicle drive system as described above is implemented.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of a control method for an electric vehicle drive system according to an embodiment of the present invention;

[0018] Figure 2 This is a flow chart of obtaining the tones that can be generated when a power battery is heated according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the rapid heating control implementation principle of an embodiment of the present invention;

[0020] Figure 4This is a flow chart of controlling a drive system to heat a power battery according to a second control instruction according to an embodiment of the present invention;

[0021] Figure 5 is a flow chart of generating a first control instruction according to a target music piece according to an embodiment of the present invention;

[0022] Figure 6 is a schematic diagram of a note generation strategy according to an embodiment of the present invention;

[0023] Figure 7 is a flow chart of generating a first control instruction according to a note sequence and the duration of each note in the note sequence according to an embodiment of the present invention;

[0024] Figure 8 Schematic diagram of target music realization spectrum according to one embodiment of the present invention;

[0025] Figure 9 is a circuit diagram of a drive system according to an embodiment of the present invention;

[0026] Figure 10 This is a circuit diagram of a power battery during discharge according to an embodiment of the present invention;

[0027] Figure 11 This is a circuit diagram of a power battery charging according to an embodiment of the present invention;

[0028] Figure 12 1 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0030] The control method, medium and electric vehicle of the electric vehicle drive system according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] Figure 1 The figure is a flow chart of a control method of an electric vehicle driving system according to an embodiment of the present invention.

[0032] In one embodiment of the present invention, Figure 1 As shown, the control method of the electric vehicle drive system includes:

[0033] S1, obtaining a tone that can be generated when the drive system heats the power battery of the electric vehicle, and recording it as a target tone.

[0034] Specifically, electric vehicle power batteries generate high-frequency sounds during heating. This chaotic, high-frequency sound is considered noise. To transform this noise into music, it's necessary to first determine the tones that the drive system can produce when heating the electric vehicle's power batteries. Different tones correspond to different frequencies. The present invention generates control instructions for the power battery based on the frequencies corresponding to these tones. The power battery then controls itself according to the control instructions and determines whether the drive system can produce a tone of the corresponding frequency.

[0035] In one embodiment of the present invention, Figure 2 As shown, the tones that can be generated when the drive system heats the power battery of the electric vehicle are obtained, including:

[0036] S11, determining the tones to be screened.

[0037] Specifically, the pitch of a sound is called its frequency. Pitch is one of the three primary subjective attributes of sound, representing the degree to which the human sense of hearing can distinguish the pitch of a sound. Pitch is primarily determined by the frequency of the sound, but is also related to its intensity. In this invention, the drive system produces the desired pitch by adjusting the frequency and amplitude of the current during rapid heating of the power battery. Table 1 below provides a comparison of pitch and frequency.

[0038] Table 1

[0039]

[0040] The bass, midrange, and treble tones listed in Table 1 are the tones to be screened in the present invention. These tones are caused by the radial vibration of the drive motor rotor during rapid heating control. Due to limitations in the motor and vehicle structure, it is difficult to generate all the tones listed in Table 1. Therefore, the tones listed in Table 1 must be screened to determine the tones that the drive motor can produce.

[0041] S12: Determine a second control instruction according to the frequency corresponding to the to-be-screened tone and the heating strategy of the drive system for the power battery.

[0042] Specifically, the drive system includes a power battery, an IGBT bridge arm group and a PMSM motor. The drive system controls the on-off of the IGBT bridge arm group to achieve rapid heating of the power battery. Figure 3 As shown in the figure, when the power battery rapid heating control is performed, the second control instruction of the motor is input, that is, the dq axis voltage instructions Ud* and Uq* of the motor. The voltage instruction directly drives the on and off of the IGBT bridge arm group through the space vector pulse width modulation link, so that the drive motor outputs the expected torque.

[0043] More specifically, the second control instruction includes voltage instructions Ud* and Uq* for the d-axis and q-axis, the d-axis voltage instruction Ud* is a sinusoidal signal, the frequency of which is set to be the same as the frequency corresponding to the tone to be filtered, and the q-axis voltage instruction is set to 0.

[0044] In one embodiment of the present invention, the second control instruction includes a d-axis voltage instruction and a q-axis voltage instruction, wherein the d-axis voltage instruction is calculated based on the frequency and amplitude coefficient corresponding to the tone to be filtered, and the q-axis voltage instruction is set to 0.

[0045] The specific calculation formula of the second control instruction is expressed by the following formula:

[0046]

[0047]

[0048] in, is the d-axis voltage command, is the q-axis voltage command, f is the frequency corresponding to the tone to be filtered, K c is the amplitude coefficient.

[0049] Specifically, the q-axis voltage command is 0, which prevents the motor from generating unintended torque output on the q-axis during rapid heating. The d-axis voltage command has a frequency corresponding to the tone to be filtered, and an amplitude corresponding to a set amplitude coefficient. A larger amplitude coefficient results in faster rapid heating of the power battery, but the amplitude coefficient cannot be increased indefinitely. The present invention controls the drive system to heat the power battery according to the second control command to achieve an appropriate amplitude coefficient.

[0050] To be more specific, the high-frequency noise is generated because the permanent magnet synchronous motor rotor is subjected to reciprocating force in the radial direction of the d-axis. The purpose of the present invention is to convert the high-frequency noise that is difficult for the public to accept into music that is easy to accept during the rapid heating control process, thereby solving the noise problem during the rapid heating process of single-module power batteries.

[0051] S13, controlling the driving system to heat the power battery according to the second control instruction to obtain a target tone.

[0052] Specifically, after determining the second control instruction based on the frequency corresponding to the to-be-screened tone, the second control instruction is input into the drive system. The drive system then performs rapid heating control on the power battery according to the second control instruction. During this rapid heating control process, the power battery generates a sound, and a determination is made as to whether the generated sound matches the expected tone. To ensure the efficiency of the power battery during rapid heating control, the amplitude coefficient of the sinusoidal signal in the second control instruction should be as large as possible.

[0053] In one embodiment of the present invention, Figure 4 As shown, controlling the drive system to heat the power battery according to the second control instruction includes:

[0054] S131 , initializing the amplitude coefficient, and controlling the drive system to heat the power battery according to a second control instruction corresponding to the initial value of the amplitude coefficient.

[0055] S132, obtaining the current value of the driving system, and determining whether the current value is greater than a current threshold.

[0056] S133: If not, increase the current amplitude coefficient, and control the drive system to heat the power battery according to the second control instruction corresponding to the current amplitude coefficient, and return to the step of obtaining the current value of the drive system.

[0057] S134: If yes, the last amplitude coefficient is recorded as the target amplitude coefficient.

[0058] When the drive system is controlled to heat the power battery according to the second control instruction corresponding to the target amplitude coefficient, the tone generated by the drive system is the target tone.

[0059] Specifically, the amplitude coefficient in the second control instruction is initialized and input into the drive system. The drive system then performs rapid heating control on the power battery according to the initialized second control instruction. To ensure that the drive system does not experience an overcurrent fault, the current value of the drive system during rapid heating control is obtained, and a determination is made as to whether the current value is greater than a current threshold. If the current value is less than a preset threshold, the amplitude coefficient is increased. As the amplitude coefficient increases, the corresponding current value of the drive system also increases. If the current value is still less than the preset threshold, the amplitude coefficient is further increased and adjusted until the maximum amplitude coefficient is reached, which does not result in an overcurrent fault in the drive system. This maximum value is recorded as the target amplitude coefficient.

[0060] More specifically, the above steps are repeated for all tones in Table 1 to obtain the maximum amplitude coefficient corresponding to each tone, i.e., the target amplitude coefficient of each tone. Taking middle tone 1 as an example, let the frequency f of the sinusoidal signal in the second control instruction be 523 Hz. The initialized second control instruction is as follows:

[0061]

[0062]

[0063] Input the control command to the drive system, obtain the current value of the drive system, and find the K under the premise that the drive system does not have an overcurrent fault. M1 The maximum value of is determined as the target amplitude coefficient of mid-range 1.

[0064] S2, determining a target music piece according to the target pitch, and generating a first control instruction according to the target music piece.

[0065] Specifically, after obtaining the target amplitude coefficient for each tone in Table 1, a target musical piece is determined based on the target tone. A musical piece can include multiple tones. A first control instruction is then generated based on the target musical piece and input into the drive system, causing the drive system to play the target musical piece. However, not all tones in Table 1 can be produced, and some may be distorted during the rapid heating control process. Therefore, before determining the target musical piece based on the target tone, the target tones must be screened.

[0066] In one embodiment of the present invention, before determining the target music according to the target pitch, the method further includes: screening the target pitch.

[0067] Specifically, after obtaining the target amplitude coefficients corresponding to the second control instruction expressions for the 21 tones in Table 1, due to the limitations of the drive system structure and the vehicle, this does not mean that the drive motor can normally produce all of the above tones; some of the tones may be distorted. The present invention can use professional tuners and sound pressure testing equipment to sequentially screen the 21 tones generated by rapid heating control through subjective evaluation. The qualified tones that pass the screening are determined to be the tones that the drive system can produce during the rapid heating control process. These tones will subsequently be used to generate music during the rapid heating control process.

[0068] In one embodiment of the present invention, determining a target music piece according to a target pitch includes: acquiring a musical note corresponding to the target pitch, and determining the target music piece according to the musical note.

[0069] Specifically, a piece of music is composed of a combination of notes of different durations. Therefore, in order to realize the drive motor to generate music, it is necessary to first design a note generation strategy. For a piece of music, the beat is its important parameter. The beat of the music is determined according to the requirements of the music. For example, if the beat of the music is 60, then each beat takes up one-sixtieth of a minute, that is, one second. When the beat of the music is 120, each beat takes up 0.5 seconds. In addition, the notes in the music are divided into whole notes, half notes, quarter notes, eighth notes, sixteenth notes, etc.; among them, whole notes take up four beats, half notes take up two beats, quarter notes take up one beat, and so on. For a piece of music, once the beat and the type of notes are determined, the required notes can be generated through the tone.

[0070] More specifically, a corresponding note is obtained based on the target pitch, and a target song is determined based on the note. The target song and the note can be determined based on a preset correspondence, such as by looking up a table to determine the target song based on the note. A first control instruction is then generated based on the target, and the power battery is controlled to rapidly heat up in accordance with the first control instruction to play the target song.

[0071] It should be noted that the drive motor cannot fully produce all 21 tones in Table 1, and thus cannot produce the notes corresponding to these 21 tones. Therefore, music screening is required to obtain music that the drive system can play, that is, the music only contains the tones that the drive system can emit (excluding tones that the drive motor cannot produce).

[0072] In one embodiment of the present invention, Figure 5 As shown, generating a first control instruction according to the target music includes:

[0073] S21, obtaining a note sequence of a target music piece and a duration of each note in the note sequence.

[0074] S22: Generate a first control instruction according to the note sequence and the duration of each note in the note sequence.

[0075] Specifically, the notes required by the music are generated by controlling the duration of the tone. A target music includes multiple notes, and the duration corresponding to each note is the duration of the tone, which is determined by the preset beat of the music. Reasonably control the duration t and amplitude K of the d-axis voltage command in the voltage command. c The expected note can be generated. The duration of the note can be determined by the beat of the music and the type of the note in the music, and this time is defined as T.

[0076] More specifically, Figure 6 As shown, the duration of a note is T = t3-t0, the time period from t0 to t1 is the entry time period of the note, and the time period from t2 to t3 is the exit time period of the note. The present invention stipulates that t1-t0 = t3-t2 = 0.1T, that is, the entry and exit time of the note are both 0.1 note duration. Figure 8 The d-axis voltage amplitude K can be obtained c The changes are as follows:

[0077]

[0078] K c represents the amplitude of the d-axis voltage sinusoidal function instruction, and f represents the frequency of the tone corresponding to the note, which can be found in Table 1.

[0079] The above formula is the control instruction for a note. According to the order of the notes in the target music, the control instructions corresponding to each note are executed separately, and the sum of them is obtained as the first control instruction. According to the first control instruction, the power battery is controlled to heat rapidly so that the drive system plays the target music.

[0080] In one embodiment of the present invention, Figure 7As shown, generating a first control instruction according to the note sequence and the duration of each note in the note sequence includes:

[0081] S221 , for the i-th note in the note sequence, obtain a control instruction corresponding to the note.

[0082] Specifically, the control instruction corresponding to the i-th note includes the d-axis voltage instruction corresponding to the i-th note and the q-axis voltage instruction corresponding to the i-th note. The d-axis voltage instruction corresponding to the i-th note is calculated based on the frequency corresponding to the tone corresponding to the i-th note and the target amplitude coefficient corresponding to the tone corresponding to the i-th note. The q-axis voltage instruction corresponding to the i-th note is set to 0.

[0083] The specific calculation formula for the control instruction corresponding to the i-th note is as follows:

[0084]

[0085]

[0086] Among them, [t1 i ,t2 i ) is the duration of the i-th note, is the d-axis voltage command corresponding to the i-th note, is the q-axis voltage command corresponding to the i-th note, f i is the frequency corresponding to the tone of the i-th note, K ci is the target amplitude coefficient corresponding to the pitch of the i-th note, where i is a positive integer.

[0087] S222: Obtain a first control instruction according to the control instruction corresponding to each note in the note sequence.

[0088] Specifically, the target music includes multiple notes, each note has a corresponding target amplitude coefficient and duration of the tone. According to the target amplitude coefficient and duration of the tone corresponding to each note, a control instruction of the note is obtained. According to the order of the notes in the music, a control instruction corresponding to a note is obtained, and the sum of them is the first control instruction.

[0089] For example, the target music is defined as consisting of three notes, namely "middle 1", "middle 2", and "middle 3". The beat of the music is 60, and the three notes are all quarter notes. Figure 8 As shown in the figure, T is the duration of each note, Kc1, Kc2, and Kc3 represent the target amplitude coefficients corresponding to middle note 1, middle note 2, and middle note 3, respectively. By looking up the table, we find that the frequencies corresponding to middle note 1, middle note 2, and middle note 3 are 523Hz, 587Hz, and 659Hz, respectively. Combining the target amplitude coefficients of each note with the first control instruction of the target music is:

[0090]

[0091]

[0092] Since the tempo of the target music is 60 beats and all three notes are quarter notes, music theory shows that T = 1s. A first control instruction is obtained, and the drive system is controlled according to the first control instruction to heat the power battery.

[0093] S3, controlling the driving system to heat the power battery according to the first control instruction, so that the driving system plays the target music.

[0094] Specifically, if Figure 9 As shown, the drive system includes a power battery, an IGBT bridge arm group and a PMSM motor. The IGBT bridge arm group is controlled to be on and off according to the first control instruction so that the drive system heats the power battery and plays the target music. Figure 9 As shown, the power battery includes a battery module B, a first relay S1 and a second relay S2. The first end of the first relay S1 is connected to the positive electrode of the battery module B, and the first end of the second relay S2 is connected to the negative electrode of the battery module B. The present invention adopts a single-module power battery. The IGBT bridge arm group includes a capacitor C, a first bridge arm T1, a second bridge arm T2, a third bridge arm T3, a fourth bridge arm T4, a fifth bridge arm T5, and a sixth bridge arm T6. The first end of the IGBT bridge arm group is connected to the second end of the first relay S1, the second end of the IGBT bridge arm group is connected to the second end of the second relay S2, the capacitor C is connected in parallel at both ends of the IGBT bridge arm group, the first bridge arm T1, the second bridge arm T2, and one end of the third bridge arm T3 are connected in common and connected to the capacitor, the fourth bridge arm T4, the fifth bridge arm T5, and one end of the sixth bridge arm T6 are connected in common and connected to the other end of the capacitor, and the midpoint of the first bridge arm T1 and the fourth bridge arm T4, the midpoint of the second bridge arm T2 and the fifth bridge arm T5, and the midpoint of the third bridge arm T3 and the sixth bridge arm T6 are respectively connected to the three ends of the three-phase PMSM motor.

[0095] More specifically, the controller controls Figure 9 The three-phase upper and lower bridge arms in the middle IGBT bridge arm group are turned on and off to generate alternating positive and negative alternating current on both sides of the positive and negative poles of the power battery. This alternating current puts the power battery in a repeated "charging" and "discharging" cycle. Due to the existence of the power battery's internal resistance, this alternating current will generate heat inside the battery, thereby achieving battery self-heating. First, control the T1, T5, and T6 bridge arms to be turned on, and the T2, T3, and T4 bridge arms to be turned off. At this time, the current direction in the drive system is as follows: Figure 10As shown by the arrows in the figure, in this state, the current of the power battery flows out from the positive electrode and enters the negative electrode, and the power battery is in a discharge state. Next, the bridge arms T2, T3, and T4 are controlled to be turned on, and the bridge arms T1, T5, and T6 are disconnected. At this time, the current in the drive system continues to flow under the action of the motor stator winding inductance, and the direction is as follows: Figure 11 As shown by the arrow in the figure, in this state, the current of the power battery flows from the positive electrode and outputs from the negative electrode, and the battery is in a charging state. The sinusoidal signal of the first control instruction makes the drive system reciprocate. Figure 10 、 Figure 11 The process shown realizes the rapid heating function of the power battery and plays the target music at the same time.

[0096] The control method of the electric vehicle drive system of the embodiment of the present invention first screens the tones that the drive system can generate during the rapid heating control process from the aspects of sound frequency and sound pressure, determines the tones and sound intensity that the drive system can generate, and secondly designs the generation and exit measures of notes. The control algorithm is designed with different music beats and note types as input, so that the drive system can generate notes of different tones. The appropriate music is determined according to the tones that the drive system can generate, and the music can be generated by the drive system. Finally, the notes and beats in the music are used as input to establish a control map of the rapid heating control drive system. The drive system is controlled according to the map, and finally the high-frequency sound generated by the drive system during the rapid heating control process is converted into a rhythm and music that is acceptable to the public and conforms to the public's sound aesthetics, thereby effectively protecting the driving experience of the occupants of the vehicle to the greatest extent while realizing the rapid heating function of the power battery. At the same time, the electric vehicle drive system control method provided by the present invention is easy to implement in engineering, does not involve hardware changes, does not increase the manufacturing cost of the entire vehicle, and solves the high-frequency noise problem to a large extent on the basis of ensuring the efficient realization of the rapid heating function, so it has good promotion value.

[0097] The present invention also provides a computer-readable storage medium.

[0098] In this embodiment, a computer program is stored on a computer-readable storage medium. When the computer program is executed by a processor, the control method of the drive system as described above is implemented.

[0099] The invention also provides an electric vehicle.

[0100] In one embodiment of the present invention, Figure 12 As shown, the electric vehicle 100 includes: a drive system 10 and a controller 20. The controller 20 includes a memory 1 and a processor 2. The memory 1 stores a computer program. When the computer program is executed by the processor 2, the control method of the electric vehicle drive system as described above is implemented.

[0101] The control method, medium and electric vehicle of the electric vehicle drive system of the embodiment of the present invention convert the high-frequency sound generated by the drive system during the rapid heating control process into rhythm and music that are acceptable to the public and conform to the public's sound aesthetics, thereby effectively protecting the driving experience of the occupants to the greatest extent while realizing the rapid heating function of the power battery.

[0102] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device), or in conjunction with such instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0103] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0104] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0105] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0107] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0108] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0109] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A control method for an electric vehicle drive system, characterized in that: The method comprises: Obtain a tone that can be generated when the drive system heats the power battery of the electric vehicle, and record it as a target tone; determining a target music piece according to the target pitch, and generating a first control instruction according to the target music piece; controlling the drive system to heat the power battery according to the first control instruction, so that the drive system plays the target music; The method of obtaining the tones that can be generated when the driving system heats the power battery of the electric vehicle includes: Determine the tones to be screened; determining a second control instruction according to a frequency corresponding to the to-be-screened tone and a heating strategy of the drive system for the power battery; controlling the drive system to heat the power battery according to the second control instruction to obtain the target tone; the second control instruction includes a d-axis voltage instruction and a q-axis voltage instruction, wherein the d-axis voltage instruction is calculated based on the frequency and amplitude coefficient corresponding to the tone to be filtered, and the q-axis voltage instruction is set to 0; The controlling the drive system to heat the power battery according to the second control instruction includes: Initializing the amplitude coefficient, and controlling the drive system to heat the power battery according to a second control instruction corresponding to the initial value of the amplitude coefficient; Obtaining a current value of the drive system, and determining whether the current value is greater than a current threshold; If not, increasing the current amplitude coefficient, and controlling the drive system to heat the power battery according to a second control instruction corresponding to the current amplitude coefficient, and returning to the step of obtaining the current value of the drive system; If so, the previous amplitude coefficient is recorded as the target amplitude coefficient; When the drive system is controlled to heat the power battery according to the second control instruction corresponding to the target amplitude coefficient, the tone generated by the drive system is the target tone.

2. The control method of the electric vehicle driving system according to claim 1, characterized in that: Before determining the target music according to the target pitch, the method further includes: The target tone is screened.

3. The control method of the electric vehicle driving system according to claim 2, characterized in that: Determining the target music according to the target pitch includes: The musical note corresponding to the target tone is obtained, and the target music is determined according to the musical note.

4. The control method of the electric vehicle driving system according to claim 3, characterized in that: Generating a first control instruction according to the target music comprises: Acquire a note sequence of the target music and a duration of each note in the note sequence; The first control instruction is generated according to the note sequence and the duration of each note in the note sequence.

5. The control method of the electric vehicle driving system according to claim 4, characterized in that: Generating the first control instruction according to the note sequence and the duration of each note in the note sequence includes: For the i-th note in the note sequence, obtaining a control instruction corresponding to the note, wherein the control instruction corresponding to the i-th note includes a d-axis voltage instruction corresponding to the i-th note and a q-axis voltage instruction corresponding to the i-th note, the d-axis voltage instruction corresponding to the i-th note being calculated based on a frequency corresponding to the tone corresponding to the i-th note and a target amplitude coefficient corresponding to the tone corresponding to the i-th note, the q-axis voltage instruction corresponding to the i-th note being set to 0, and i being a positive integer; The first control instruction is obtained according to the control instruction corresponding to each note in the note sequence.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the drive system according to any one of claims 1 to 5 is implemented.

7. An electric vehicle, characterized in that: include: A drive system and a controller, the controller including a memory and a processor, the memory storing a computer program, and the computer program, when executed by the processor, implementing the control method of the electric vehicle drive system according to any one of claims 1 to 5.

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