Vehicle control circuit, vehicle boost control system and vehicle

Abstract

The invention is suitable for the technical field of vehicle control, and particularly relates to a vehicle control circuit, a vehicle boost control system and a vehicle. A boost branch and a direct connection branch are arranged between a battery and a motor controller of the vehicle, a booster is arranged on the boost branch, a primary side of the booster is used for connecting the battery of the vehicle, a secondary side of the booster is used for connecting the motor controller of the vehicle, one end of the direct connection branch is used for connecting the battery, and the other end of the direct connection branch is used for connecting the motor controller. The other end of the direct connection branch circuit is used for being connected with a motor controller, so that the boosting branch circuit is conducted and the direct connection branch circuit is cut off when the booster works, the direct connection branch circuit is conducted and the boosting branch circuit is cut off when the booster does not work, and direct connection is conducted when the booster does not work, so that the situation that power is still supplied through the boosting branch circuit when the booster does not work is avoided; therefore, the power consumption of the vehicle is reduced, and the energy efficiency of the vehicle is improved.

Description

Technical Field

[0001] The present application is applicable to the field of vehicle control technology, and in particular relates to a vehicle control circuit, a vehicle boost control system and a vehicle. Background Art

[0002] At present, with the development of new energy vehicles, in addition to conventional engine drive, vehicles can also be driven by motors. In order to meet the high voltage requirements of some motors, some new energy vehicles are also equipped with boost devices. The vehicle controller queries the system efficiency-voltage relationship pre-set in the storage unit according to the current vehicle state, and controls the boost device to output the voltage corresponding to the target efficiency, so that the boost device converts the fixed voltage of the battery into different voltage platforms to adapt to the voltage platform of the corresponding electric drive system, thereby achieving the purpose of controlling the efficiency of the entire electric drive system.

[0003] However, when the booster is not boosting voltage but only conducting, due to the existence of inductive resistance and on-resistance such as booster copper bar, some loss will occur in the above resistance when the battery outputs power. Therefore, how to reasonably use the booster to reduce the power loss of the vehicle has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, embodiments of the present application provide a vehicle control circuit, a vehicle boost control system and a vehicle to solve the problem of how to reasonably use a booster to reduce power loss in the vehicle.

[0005] In a first aspect, an embodiment of the present application provides a vehicle control circuit, comprising: a boost branch and a direct-connection branch connected in parallel, wherein a booster is provided on the boost branch, wherein a primary side of the booster is used to connect to a battery of a vehicle, and a secondary side of the booster is used to connect to a motor controller of the vehicle; One end of the direct connection branch is used to connect to the battery of the vehicle, and the other end of the direct connection branch is used to connect to the motor controller of the vehicle; Control is applied so that the boost branch is turned on and the direct-connected branch is turned off when the booster is working, and the direct-connected branch is turned on and the boost branch is turned off when the booster is not working.

[0006] In one embodiment, a first switch is provided on the direct-connected branch, a first switch is provided on the direct-connected branch, and a second switch is provided on the boost branch. When the booster is working, the first switch is turned off and the second switch is closed. When the booster is not working, the first switch is closed and the second switch is turned off.

[0007] In one embodiment, the control ends of the first switch and the second switch are both used to connect to a battery management system of a vehicle battery to perform a shutoff or closing action based on a control instruction of the battery management system. In one embodiment, the booster includes a boost controller, an inductor, a first switch tube, a second switch tube and a first capacitor; The inductor and the first switch tube are sequentially arranged on the connection line between the positive electrode of the battery of the vehicle and the positive electrode of the motor controller of the vehicle, one end of the second switch tube is connected to the line between the inductor and the first switch tube, and the other end of the second switch tube is connected to the connection line between the negative electrode of the battery and the negative electrode of the motor controller of the vehicle, one end of the first capacitor is connected to the connection line between the first switch tube and the positive electrode of the motor controller of the vehicle, and the other end of the capacitor is connected to the connection line between the second switch tube and the negative electrode of the motor controller of the vehicle; The control ends of the first switch tube and the second switch tube are both connected to the boost controller to achieve switch control of the first switch tube and the second switch tube.

[0008] In one embodiment, a sampling branch is further included, one end of which is connected to the connection line between the booster and the motor controller of the vehicle to collect the voltage signal at the output end of the booster, and the other end of the sampling branch is used to connect to the boost controller to send the collected voltage signal to the signal line of the vehicle to collect the voltage signal.

[0009] In one embodiment, the signal line is a controller area network bus of the vehicle.

[0010] In one implementation, both the first switch transistor and the second switch transistor are N-channel enhancement mode MOS transistors. In one implementation, a second capacitor is provided between the boost branch and the direct-connect branch. In a second aspect, an embodiment of the present application provides a vehicle boost control system, comprising a battery, a motor controller, and the vehicle control circuit described in the first aspect and its improvement, wherein the primary side of the boost is connected to the battery, the secondary side of the boost is connected to the motor controller, one end of the direct branch is connected to the battery, and the other end of the direct branch is connected to the motor controller.

[0011] In one embodiment, the vehicle boost control system controls the vehicle to operate in one of boost mode, non-boost mode, and battery heating mode. When the motor's efficient operating voltage is higher than the battery pack voltage or in sports mode, the vehicle is controlled to operate in boost mode; when the motor's efficient operating voltage is not higher than the battery pack voltage or in economy mode, the vehicle is controlled to operate in non-boost mode; when the battery needs to be heated, the vehicle is controlled to operate in battery heating mode.

[0012] In a third aspect, an embodiment of the present application provides a vehicle, comprising a drive motor and the vehicle boost control system described in the second aspect, wherein the motor controller is connected to the drive motor.

[0013] Compared with the prior art, the embodiments of the present application have the following beneficial effects: a boost branch and a direct-connection branch are provided between the battery and the motor controller of the vehicle, a booster is provided on the boost branch, the primary side of the booster is used to connect to the battery of the vehicle, the secondary side of the booster is used to connect to the motor controller of the vehicle, one end of the direct-connection branch is used to connect to the battery, and the other end of the direct-connection branch is used to connect to the motor controller, so as to turn on the boost branch and turn off the direct-connection branch when the booster is working, and turn on the direct-connection branch and turn off the boost branch when the booster is not working, wherein the direct-connection conduction when the booster is not working avoids power supply through the boost branch when the booster is not working, thereby avoiding battery energy loss, reducing the power consumption of the vehicle, and improving the energy efficiency of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 is a structural schematic diagram of a vehicle control circuit provided in Example 1 of the present application; Figure 2 It is a structural schematic diagram of a vehicle control circuit provided in Example 2 of the present application; Figure 3 It is a structural schematic diagram of a vehicle control circuit provided in Example 3 of the present application; Figure 4 It is a structural schematic diagram of a booster provided in Embodiment 4 of the present application; Figure 5 It is a structural schematic diagram of a vehicle boost control system provided in Embodiment 5 of the present application; Figure 6It is a structural schematic diagram of a control device provided in Example 6 of the present application; Among them, 1. boost branch, 101. booster, 2. direct connection branch, 3. battery, 301. battery management system, 4. motor controller, 5. first switch, 6. second switch, 7. sampling branch, 8. drive motor, 9. transmission system, 10. wheel, 11. vehicle controller. DETAILED DESCRIPTION

[0016] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0017] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0018] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0019] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0020] It should be understood that the size of the serial numbers of the steps in the following embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0021] In order to illustrate the technical solution of the present application, a specific embodiment is provided below for illustration.

[0022] See also Figure 1 , is a structural diagram of a vehicle control circuit provided in Example 1 of the present application. The vehicle control circuit comprises: a boost branch 1 and a direct-connection branch 2, a booster 101 is provided on the boost branch 1, the primary side of the booster 101 is used to connect to the battery 3 of the vehicle, the secondary side of the booster 101 is used to connect to the motor controller 4 of the vehicle, one end of the direct-connection branch 2 is used to connect to the battery 3, and the other end of the direct-connection branch 2 is used to connect to the motor controller 4, and control is applied so that the boost branch 1 is turned on and the direct-connection branch 2 is turned off when the booster 101 is working, and the direct-connection branch 2 is turned on and the boost branch 1 is turned off when the booster 101 is not working.

[0023] The battery 3 of the vehicle is connected to the motor controller 4 for power supply, so that the motor controller 4 transmits electric energy to the drive motor to operate the drive motor, and the drive motor is used to drive the corresponding transmission system to the wheels to drive the vehicle.

[0024] Among them, the above-mentioned boost branch 1 and direct branch 2 are arranged between the battery 3 and the motor controller 4 to realize the power supply connection between the two, that is, the boost branch 1 and the direct branch 2 are arranged in parallel between the battery 3 and the motor controller 4. When the booster 101 is working, the boost branch 1 is turned on and the direct branch 2 is turned off, that is, the battery 3 supplies power to the motor controller 4 through the boost branch 1, and the output voltage of the battery 1 is increased, thereby improving the peak power performance of the motor. When the booster 101 is not working, the direct branch 2 is turned on and the boost branch 1 is turned off, and the battery 3 supplies power to the motor controller 4 through the direct branch 2, avoiding the conduction loss of the booster 101, thereby improving the efficiency of the whole vehicle.

[0025] In addition, no device with a large resistance is provided in the direct-connection branch 2 to avoid a situation where high energy consumption occurs when the direct-connection branch 2 is turned on.

[0026] The embodiment of the present application can not only ensure the normal use of the booster, but also can be directly connected when the booster is not working, thereby avoiding the battery energy loss caused by still supplying power through the boost branch when the booster is not working, reducing the power consumption of the vehicle and improving the energy efficiency of the vehicle.

[0027] like Figure 2 As shown, it is a structural schematic diagram of a vehicle control circuit provided in the second embodiment of the present application. On the basis of the above-mentioned first embodiment, the direct-connection branch 2 is provided with a first switch 5, and the boost branch 2 is provided with a second switch 6. When the booster 101 is working, the first switch 5 is turned off and the second switch 6 is closed. When the booster 101 is not working, the first switch 5 is closed and the second switch is turned off 6.

[0028] For the boost branch 1 and the direct-connect branch 2, switches are set to control the conduction and cutoff of the branches. When in use, the first switch 5 and the second switch 6 can be connected by configuring a corresponding controller to control the switch off or on control, thereby achieving independent control of each branch.

[0029] For example, the first switch 5 and the second switch 6 are both control switches, and the controller is an independently set control device. The controller can obtain information about whether the booster 101 boosts the voltage, so that when the booster 101 is working, the first switch 5 is controlled to be turned off and the second switch 6 is controlled to be closed. When the booster 101 is not working, the first switch 5 is controlled to be closed and the second switch is controlled to be turned off.

[0030] like Figure 3 As shown, it is a structural schematic diagram of a vehicle control circuit provided in the third embodiment of the present application. Specifically, based on the second embodiment, the control ends of the first switch 5 and the second switch 6 are both used to connect to the battery management system (BMS) 301 in the battery 3, and perform a shut-off or shut-off action based on the control instruction of the battery management system 301.

[0031] The existing control device in the vehicle is used to connect and control the switch, wherein the battery management system can obtain information on whether the booster 101 is boosting the voltage, so that when the booster 101 is working, the first switch 5 is controlled to be turned off and the second switch 6 is controlled to be closed, and when the booster 101 is not working, the first switch 5 is controlled to be closed and the second switch is controlled to be turned off.

[0032] Compared with setting up a new control device, the embodiment of the present application uses the existing control device of the vehicle to reduce the vehicle cost. Only wiring is required, and there is no need to configure the installation position of the controller, thereby reducing the complexity of vehicle assembly. like Figure 4 , which is a schematic diagram of the structure of a booster provided in Embodiment 4 of the present application. The booster includes a boost controller ( Figure 4 ), an inductor L1, a first switch tube Q1, a second switch tube Q2 and a first capacitor C1.

[0033] The inductor L1 and the first switch tube Q1 are sequentially arranged on the connection line between the positive electrode of the battery 3 and the positive electrode of the motor controller 4, one end of the second switch tube Q2 is connected to the line between the inductor and the first switch tube Q1, and the other end of the second switch tube Q2 is connected to the connection line between the negative electrode of the battery and the negative electrode of the motor controller, one end of the first capacitor is connected to the connection line between the first switch tube Q1 and the positive electrode of the motor controller, and the other end of the capacitor is connected to the connection line between the second switch tube Q2 and the negative electrode of the motor controller.

[0034] The control ends of the first switch tube Q1 and the second switch tube Q2 are both connected to the boost controller to implement switch control of the first switch tube Q1 and the second switch tube Q2.

[0035] When the voltage output by the battery 3 needs to be operated, the first switch tube Q1 and the second switch tube Q2 are controlled by the boost control according to the required boost condition, so as to increase the output voltage.

[0036] The booster in the embodiment of the present application is a BOOST booster, which can achieve a rapid response to the battery boost demand to meet the vehicle's demand for high-speed voltage transformation, thereby meeting the torque output of the motor.

[0037] In one embodiment, if Figure 4 As shown, the first switch tube Q1 and the second switch tube Q2 are both N-channel enhancement type MOS tubes. Of course, MOS tubes with other channels or other controllable switches can also be used in the booster 101. In one embodiment, if Figure 4 As shown, the vehicle control circuit also includes a sampling branch 7, one end of the sampling branch 7 is connected to the connection line between the booster 101 and the motor controller 4 to collect the voltage signal at the output end of the booster 101, and the other end of the sampling branch 7 is used to connect the boost controller to send the collected voltage signal to the signal line of the vehicle to collect the voltage signal. Among them, the controller used to control the first switch 5 and the second switch 6 in the above-mentioned embodiment 2, or the battery management system 301 used to control the first switch 5 and the second switch 6 in the above-mentioned embodiment 3 can be used to collect voltage signals.

[0038] Of course, the boost controller further includes a voltage sampling microcontroller unit (MCU), and the voltage sampling MCU is connected to the sampling branch 7 to achieve high voltage sampling.

[0039] The output voltage after the booster 101 can be accurately collected through the sampling branch 7, and then used for comparison with the output voltage of the battery 3 to determine whether the booster 101 is in the boosting state. The voltage here can accurately reflect the output voltage of the booster 101, which helps to improve the accuracy of the boost judgment and the accuracy of the control switch. In one embodiment, the signal line is the vehicle's controller area network (CAN), that is, the voltage signal output by the booster 101 is connected to the vehicle's CAN, so that all devices connected to the CAN can obtain the voltage signal, such as the battery management system 301, the vehicle controller unit (VCU), etc.

[0040] In one embodiment, a second capacitor C2 is provided between the boost branch 1 and the direct connection branch 2. That is, a capacitor is provided between two parallel lines, and by adding the second capacitor C2, voltage mutation and power unevenness can be effectively avoided. See also Figure 5 , which is a structural schematic diagram of a vehicle boost control system provided in Example 5 of the present application, wherein, based on the vehicle control circuit, it also includes a battery 3 and a motor controller 4. The motor controller 4 supplies power to the drive motor 8, and the drive motor 8 drives the wheel 10 through the transmission system 9, so that the vehicle can move.

[0041] The vehicle boost control system of the present application can be not only a pure electric vehicle (Electric Vehicle, EV), but also a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, PHEV) and a hybrid electric vehicle (Hybrid Electric Vehicle, HEV). As long as it is a vehicle with a battery, a motor controller and a drive motor, the power supply system of the present application can be adopted.

[0042] In the economic mode, when the booster is not working and is only conducting, K1 is closed and K2 is disconnected, and the battery 3 is directly connected to the motor controller 4 to avoid the conduction loss of the booster, thereby improving the efficiency of the whole vehicle. In the sports mode or the boost-transformation mode, the voltage output by the battery 3 is increased by the booster 101, K1 is disconnected, and K2 is closed to improve the external characteristics or efficiency of the drive motor.

[0043] In addition, the communication of various control devices, including the vehicle controller 11, BMS 301, motor controller 4 and boost controller, is realized through the vehicle CAN bus, and the opening and closing of the relays (ie, K1 and K2) are controlled by BMS 301.

[0044] In the present application, the working power of the drive motor 8 can be adjusted by boosting the voltage, so that the drive motor 8 can be raised to a certain temperature, thereby performing heat exchange through the thermal management system of the battery 3 and the drive motor 8 to achieve heating of the battery 3, thereby improving the heating efficiency of the battery pack.

[0045] In one embodiment, the vehicle boost control system controls the vehicle to operate in one of boost mode, non-boost mode, and battery heating mode. When the motor's efficient operating voltage is higher than the battery pack voltage or in sports mode, the vehicle is controlled to operate in boost mode; when the motor's efficient operating voltage is not higher than the battery pack voltage or in economy mode, the vehicle is controlled to operate in non-boost mode; when the battery needs to be heated, the vehicle is controlled to operate in battery heating mode.

[0046] In this application, it can be divided into non-boost mode (i.e. economic mode), boost mode (i.e. sports mode) and battery heating mode. Under the information interaction between the vehicle controller 11, the motor controller 4, the boost controller and the BMS 301, the opening and closing control of the relays (i.e. K1, K2) is finally implemented through the BMS 301. For specific modes, refer to the following Table 1: Table 1 In addition, an embodiment of the present application also provides a vehicle, including a drive motor 8, a transmission system 9, wheels 10 and the above-mentioned vehicle boost control system, the motor controller 4 is connected to the drive motor 8, and the drive motor 8 is mechanically connected to the transmission system 9 and the wheels 10.

[0047] Those skilled in the art can understand that the battery management system 301, the vehicle controller 11, the motor controller 4, the boost controller, etc. in this application are all control devices, such as Figure 6 As shown, it is a structural schematic diagram of a control device provided in Example 6 of the present application, wherein Figure 6 This is merely an example of a control device and does not constitute a limitation on the control device. The control device may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0048] The processor may be a CPU, or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0049] The memory includes a readable storage medium, an internal memory, etc., wherein the internal memory may be the memory of a computer device, and the internal memory provides an environment for the operation of the operating system and computer-readable instructions in the readable storage medium. The readable storage medium may be a hard disk of a computer device, and in other embodiments, it may also be an external storage device of the computer device, for example, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device. Further, the memory may also include both an internal storage unit of the computer device and an external storage device. The memory is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of a computer program, etc. The memory may also be used to temporarily store data that has been output or is to be output.

[0050] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0051] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0052] In the embodiments provided in the present application, it should be understood that the disclosed devices / control equipment and methods can be implemented in other ways. For example, the device / control equipment embodiments described above are merely schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0053] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A vehicle control circuit, characterized in that: include: A boost branch and a direct-connection branch connected in parallel, wherein a booster is provided on the boost branch, the primary side of the booster is used to connect to a battery of a vehicle, and the secondary side of the booster is used to connect to a motor controller of the vehicle; One end of the direct connection branch is used to connect to the battery of the vehicle, and the other end of the direct connection branch is used to connect to the motor controller of the vehicle; Control is applied so that the boost branch is turned on and the direct-connected branch is turned off when the booster is working, and the direct-connected branch is turned on and the boost branch is turned off when the booster is not working.

2. The vehicle control circuit according to claim 1, characterized in that: A first switch is provided on the direct-connection branch, and a second switch is provided on the boost branch. When the booster is working, the first switch is turned off and the second switch is closed. When the booster is not working, the first switch is closed and the second switch is turned off.

3. The vehicle control circuit according to claim 2, characterized in that: The control ends of the first switch and the second switch are both used to connect to a battery management system of a vehicle battery to perform a shutoff or closing action based on a control instruction of the battery management system.

4. The vehicle control circuit according to claim 1, characterized in that: The booster includes a boost controller, an inductor, a first switch tube, a second switch tube and a first capacitor; The inductor and the first switch tube are sequentially arranged on the connection line between the positive electrode of the battery of the vehicle and the positive electrode of the motor controller of the vehicle, one end of the second switch tube is connected to the line between the inductor and the first switch tube, and the other end of the second switch tube is connected to the connection line between the negative electrode of the battery and the negative electrode of the motor controller of the vehicle, one end of the first capacitor is connected to the connection line between the first switch tube and the positive electrode of the motor controller of the vehicle, and the other end of the capacitor is connected to the connection line between the second switch tube and the negative electrode of the motor controller of the vehicle; The control ends of the first switch tube and the second switch tube are both connected to the boost controller to achieve switch control of the first switch tube and the second switch tube.

5. The vehicle control circuit according to claim 4, characterized in that: It also includes a sampling branch, one end of which is connected to the connection line between the booster and the motor controller of the vehicle to collect the voltage signal at the output end of the booster, and the other end of the sampling branch is used to connect the boost controller to send the collected voltage signal to the signal line of the vehicle to collect the voltage signal.

6. The vehicle control circuit according to claim 5, characterized in that: The signal line is the controller area network bus of the vehicle.

7. The vehicle control circuit according to claim 4, characterized in that: The first switch tube and the second switch tube are both N-channel enhancement type MOS tubes.

8. The vehicle control circuit according to any one of claims 1 to 7, characterized in that: A second capacitor is arranged between the boost branch and the direct-connect branch.

9. A vehicle boost control system, characterized in that: It includes a battery, a motor controller and a vehicle control circuit as described in any one of claims 1 to 8, wherein the primary side of the booster is connected to the battery, the secondary side of the booster is connected to the motor controller, one end of the direct branch is connected to the battery, and the other end of the direct branch is connected to the motor controller.

10. The vehicle boost control system according to claim 9, characterized in that: The vehicle boost control system controls the vehicle to operate in one of the boost mode, non-boost mode, and battery heating mode. When the motor's efficient operating voltage is higher than the battery pack voltage or in the sports mode, the vehicle is controlled to operate in the boost mode; when the motor's efficient operating voltage is not higher than the battery pack voltage or in the economy mode, the vehicle is controlled to operate in the non-boost mode; when the battery needs to be heated, the vehicle is controlled to operate in the battery heating mode.

11. A vehicle, characterized in that: The vehicle comprises a driving motor and the vehicle boost control system as claimed in claims 9 and 10, wherein the motor controller is connected to the driving motor.

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