Vehicle control circuit, vehicle boost control system and vehicle

Abstract

The utility model 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 application 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. BACKGROUND

[0002] At present, with the development of new energy vehicles, in addition to the conventional engine driving, the vehicle can also be driven by an electric motor. In order to meet the high voltage requirement of some electric motors, some new energy vehicles are also equipped with a boost device. The vehicle controller queries the system efficiency-voltage relationship 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 boosted and only conducts, due to the existence of inductance resistance and booster copper bar conduction resistance, part of the battery output power will be lost in the above resistance. Therefore, how to reasonably use the booster to reduce the power loss of the vehicle has become a problem to be solved. SUMMARY

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

[0005] In a first aspect, the application embodiments provide a vehicle control circuit, comprising: a boost branch and a direct connection branch connected in parallel, a booster is arranged on the boost branch, the primary side of the booster is used to connect a battery of a vehicle, and the secondary side of the booster is used to connect a motor controller of the vehicle.

[0006] One end of the direct connection branch is used to connect the battery of the vehicle, and the other end of the direct connection branch is used to connect the motor controller of the vehicle.

[0007] Control is applied to make the booster conduct the boost branch and cut off the direct connection branch when the booster works, and make the booster conduct the direct connection branch and cut off the boost branch when the booster does not work.

[0008] In an embodiment, a first switch is arranged on the direct connection branch, and a second switch is arranged on the boost branch. When the booster works, the first switch is turned off and the second switch is turned on. When the booster does not work, the first switch is turned on and the second switch is turned off.

[0009] In an embodiment, the control terminals of the first switch and the second switch are connected to a battery management system of a vehicle battery to perform the turn-off or turn-on action based on a control instruction of the battery management system.

[0010] In an embodiment, the voltage booster comprises a voltage booster controller, an inductor, a first switch tube, a second switch tube and a first capacitor.

[0011] The inductor and the first switch tube are sequentially arranged on a connection line between a positive electrode of a vehicle battery and a positive electrode of a motor controller of the vehicle, one end of the second switch tube is connected to the connection line between the inductor and the first switch tube, the other end of the second switch tube is connected to a connection line between a negative electrode of the vehicle battery and a 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 first capacitor is connected to the connection line between the second switch tube and the negative electrode of the motor controller of the vehicle.

[0012] The control terminals of the first switch tube and the second switch tube are connected to the voltage booster controller to realize the switch control of the first switch tube and the second switch tube.

[0013] In an embodiment, a sampling branch is further included, one end of the sampling branch is connected to a connection line between the voltage booster and the motor controller of the vehicle to collect a voltage signal at an output end of the voltage booster, and the other end of the sampling branch is connected to the voltage booster controller to send the collected voltage signal to a signal line of the vehicle to collect the voltage signal.

[0014] In an embodiment, the signal line is a controller area network bus of the vehicle.

[0015] In an embodiment, the first switch tube and the second switch tube are both N-channel enhancement mode MOS tubes.

[0016] In an embodiment, a second capacitor is arranged between the voltage boosting branch and the direct connection branch.

[0017] In a second aspect, an embodiment of the present application provides a vehicle voltage boosting control system, comprising a vehicle battery, a motor controller and a vehicle control circuit according to the first aspect and its improvements, a primary side of the voltage booster is connected to the vehicle battery, a secondary side of the voltage booster is connected to the motor controller, one end of the direct connection branch is connected to the vehicle battery, and the other end of the direct connection branch is connected to the motor controller.

[0018] In an embodiment, the vehicle boost control system controls the vehicle to work in one of a boost mode, a non-boost mode and a battery heating mode, wherein the vehicle is controlled to work in the boost mode when the motor efficient working voltage is higher than the battery pack voltage or in a sport mode, the vehicle is controlled to work in the non-boost mode when the motor efficient working voltage is not higher than the battery pack voltage or in an economic mode, and the vehicle is controlled to work in the battery heating mode when the battery needs to be heated.

[0019] In a third aspect, the embodiments of the present application provide a vehicle, comprising a driving motor and the vehicle boost control system of the second aspect, wherein the motor controller is connected to the driving motor.

[0020] Compared with the prior art, the embodiments of the present application have the beneficial effects that: the embodiments of the present application are provided with a boost branch and a direct connection branch between the battery and the motor controller of the vehicle, the boost branch is provided with a booster, the primary side of the booster is used to connect the battery of the vehicle, the secondary side of the booster is used to connect the motor controller of the vehicle, one end of the direct connection branch is used to connect the battery, and the other end of the direct connection branch is used to connect the motor controller, so as to turn on the boost branch and turn off the direct connection branch when the booster works, and turn on the direct connection branch and turn off the boost branch when the booster does not work, wherein the direct connection branch is turned on when the booster does not work, so as to avoid the power supply through the boost branch when the booster does not work, thereby reducing the power consumption of the vehicle and improving the energy efficiency of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of a vehicle control circuit provided by an embodiment of the present application;

[0023] Figure 2 is a structural schematic diagram of a vehicle control circuit provided by an embodiment of the present application;

[0024] Figure 3 is a structural schematic diagram of a vehicle control circuit provided by an embodiment of the present application;

[0025] Figure 4 is a structural schematic diagram of a booster provided by an embodiment of the present application;

[0026] Figure 5is a structural schematic diagram of a vehicle boost control system provided by Embodiment Five of the present application;

[0027] Figure 6 is a structural schematic diagram of a control device provided by Embodiment Six of the present application;

[0028] Wherein, 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

[0029] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0030] It should be understood that the term "comprise" when used in the present application and the appended claims indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0031] In addition, in the description of the present application and the appended claims, the terms "first", "second", "third", etc. are used only for the purpose of distinguishing between different features, and cannot be understood as indicating or implying relative importance.

[0032] In the present application, the reference "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearance of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", etc. in various places throughout the specification is not necessarily all referring to the same embodiment, unless otherwise specifically stated. The terms "comprise", "include", "have" and their conjugates mean "including but not limited to", unless otherwise specifically stated.

[0033] It should be understood that the size of the serial number of each step in the following embodiments does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0034] In order to illustrate the technical solutions of the present application, the following will be illustrated by specific embodiments.

[0035] Referring to Figure 1 , it is a structural schematic diagram of a vehicle control circuit provided by Embodiment One of the present application. The vehicle control circuit comprises: a boost branch 1 and a direct connection branch 2, the boost branch 1 is provided with a booster 101, the original side of the booster 101 is used for connecting a battery 3 of the vehicle, the secondary side of the booster 101 is used for connecting a motor controller 4 of the vehicle, one end of the direct connection branch 2 is used for connecting the battery 3, the other end of the direct connection branch 2 is used for connecting the motor controller 4, and control is applied to make the boost branch 1 conductive and the direct connection branch 2 cut off when the booster 101 works, and make the direct connection branch 2 conductive and the boost branch 1 cut off when the booster 101 does not work.

[0036] The battery 3 of the vehicle is in power supply connection with the motor controller 4, so that the motor controller 4 delivers electric energy to a driving motor, so that the driving motor operates to drive the corresponding transmission system to the wheels to drive the vehicle to run.

[0037] Among them, the above-mentioned boost branch 1 and direct connection branch 2 are arranged between the battery 3 and the motor controller 4 to realize the power supply connection of the two, that is, the boost branch 1 and the direct connection branch 2 are arranged in parallel between the battery 3 and the motor controller 4, when the booster 101 works, the boost branch 1 is conductive and the direct connection branch 2 is cut off, that is, the battery 3 supplies power to the motor controller 4 through the boost branch 1, the output voltage of the battery 1 is improved, thereby improving the peak power performance of the motor, when the booster 101 does not work, the direct connection branch 2 is conductive and the boost branch 1 is cut off, the battery 3 supplies power to the motor controller 4 through the direct connection branch 2, avoiding the conduction loss of the booster 101, thereby improving the efficiency of the whole vehicle.

[0038] In addition, no device with large resistance is arranged in the direct connection branch 2 to avoid the situation that high energy consumption occurs when the direct connection branch 2 is conductive.

[0039] The embodiment of the present application can not only ensure the normal use of the booster, but also can be conductive through the direct connection when the booster does not work, avoiding the situation that the battery energy is wasted and the vehicle power consumption is reduced when the boost branch is still used for power supply when the booster does not work, and improving the energy efficiency of the vehicle.

[0040] As Figure 2 shown, it is a structural schematic diagram of a vehicle control circuit provided by Embodiment Two of the present application. On the basis of the above-mentioned Embodiment One, 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 works, the first switch 5 is off and the second switch 6 is closed, when the booster 101 does not work, the first switch 5 is closed and the second switch 6 is off.

[0041] For the boost branch 1 and the direct connection branch 2, switches are arranged to control the conduction and cut-off of the branches. When in use, the first switch 5 and the second switch 6 can be controlled by a corresponding controller to realize the control of the switch opening or closing, so as to realize the independent control of each branch.

[0042] For example, the first switch 5 and the second switch 6 are both control switches, and the controller is an independently arranged control device. The controller can obtain the information of whether the voltage booster 101 boosts, so as to realize the control of the first switch 5 opening and the control of the second switch 6 closing when the voltage booster 101 works, and realize the control of the first switch 5 closing and the control of the second switch 6 opening when the voltage booster 101 does not work.

[0043] As shown in FIG. 3, it is a structural schematic diagram of a vehicle control circuit provided in Embodiment Three of the present application. Based on Embodiment Two, specifically, the control end of the first switch 5 and the control end of the second switch 6 are both connected with a battery management system (BMS) 301 in the battery 3, and the opening or closing action is performed based on the control instruction of the battery management system 301. Figure 3

[0044] The existing control device in the vehicle is connected with the switch and controls the switch. The battery management system can obtain the information of whether the voltage booster 101 boosts, so as to realize the control of the first switch 5 opening and the control of the second switch 6 closing when the voltage booster 101 works, and realize the control of the first switch 5 closing and the control of the second switch 6 opening when the voltage booster 101 does not work.

[0045] Compared with arranging a new control device, the use of the existing control device of the vehicle can reduce the cost of the vehicle, only needs to be wired, does not need to arrange the installation position of the controller, and reduces the complexity of vehicle assembly.

[0046] As shown in FIG. 4, it is a structural schematic diagram of a voltage booster provided in Embodiment Four of the present application. The voltage booster includes a voltage booster controller (not shown), an inductor L1, a first switch tube Q1, a second switch tube Q2, and a first capacitor C1. Figure 4 Figure 4

[0047] ​​​The inductor L1 and the first switch Q1 are arranged in sequence on a connection line between the positive pole of the battery 3 and the positive pole of the motor controller 4, one end of the second switch Q2 is connected to the line between the inductor and the first switch Q1, the other end of the second switch Q2 is connected to the connection line between the negative pole of the battery and the negative pole of the motor controller, one end of the first capacitor is connected to the connection line between the first switch Q1 and the positive pole of the motor controller, and the other end of the capacitor is connected to the connection line between the second switch Q2 and the negative pole of the motor controller.

[0048] The control ends of the first switch Q1 and the second switch Q2 are connected to the boost controller to realize the switching control of the first switch Q1 and the second switch Q2.

[0049] When the voltage output by the battery 3 needs to be used, the first switch Q1 and the second switch Q2 are controlled by the boost controller according to the required boost condition to realize the increase of the output voltage.

[0050] The booster in the embodiment of the application is a BOOST booster, which can realize the rapid response to the battery boost demand to meet the demand of the vehicle for high-speed voltage conversion, thereby meeting the torque output of the motor.

[0051] In an embodiment, as shown in Figure 4 The first switch Q1 and the second switch Q2 are both N-channel enhancement mode MOS tubes. Of course, other channel MOS tubes or other controllable switches can also be used in the booster 101.

[0052] In an embodiment, as shown in Figure 4 The vehicle control circuit further 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 two, or the battery management system 301 used to control the first switch 5 and the second switch 6 in the above-mentioned embodiment three can be used to collect the voltage signal.

[0053] 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 realize the sampling of high voltage.

[0054] The output voltage after the voltage booster 101 can be accurately collected through the sampling branch 7, so as to be compared with the output voltage of the battery 3, to determine whether the voltage booster 101 is in voltage boosting, and the voltage at this place can accurately reflect the output voltage of the voltage booster 101, which helps to improve the accuracy of voltage boosting determination and the accuracy of switch control.

[0055] In an embodiment, the signal line is a Controller Area Network (CAN) bus of the vehicle, that is, the voltage signal output by the voltage booster 101 is connected to the CAN of the vehicle, so that all devices connected to the CAN can obtain the voltage signal, for example, the battery management system 301, the Vehicle Controller Unit (VCU), etc.

[0056] In an embodiment, a second capacitor C2 is arranged between the voltage boosting branch 1 and the direct connection branch 2. That is, a capacitor is arranged between the two parallel lines, and by increasing the second capacitor C2, voltage mutation and power unevenness can be effectively avoided.

[0057] Referring to Figure 5 A structural schematic diagram of a vehicle voltage boosting control system provided in Embodiment Five is shown, wherein, on the basis of the vehicle control circuit, the battery 3 and the motor controller 4 are further included, the motor controller 4 supplies power to the drive motor 8, the drive motor 8 drives the wheels 10 through the transmission system 9, so that the vehicle is enabled to move.

[0058] The vehicle voltage boosting control system of the present application can not only be an Electric Vehicle (EV), but also a Plug-in Hybrid Electric Vehicle (PHEV) and a Hybrid Electric Vehicle (HEV), as long as the vehicle has a battery, a motor controller and a drive motor, the power supply system of the present application can be used.

[0059] In the economic mode, when the voltage booster is not working, only K1 is closed and K2 is opened, the battery 3 is directly connected to the motor controller 4, so as to avoid the conduction loss of the voltage booster, and thus improve the efficiency of the vehicle. In the motion mode or the voltage boosting mode, the voltage output by the battery 3 is boosted by the voltage booster 101, K1 is opened and K2 is closed, so as to improve the external characteristic or efficiency of the drive motor.

[0060] In addition, communication of various control devices is realized through the vehicle CAN bus, including the vehicle controller 11, the BMS 301, the motor controller 4 and the voltage boosting controller, and the opening and closing of the relays (i.e., K1 and K2) are controlled by the BMS 301.

[0061] In the present application, the working power of the driving motor 8 can be adjusted by boosting, so that the driving motor 8 can generate a certain temperature, and then the heat exchange is performed through the thermal management system of the battery 3 and the driving motor 8, so as to heat the battery 3, thereby improving the heating efficiency of the battery pack.

[0062] In an embodiment, the vehicle boosting control system controls the vehicle to work in one of the boosting mode, the non-boosting mode and the battery heating mode, wherein when the motor efficient working voltage is higher than the battery pack voltage or in the sport mode, the vehicle is controlled to work in the boosting mode; when the motor efficient working voltage is not higher than the battery pack voltage or in the economic mode, the vehicle is controlled to work in the non-boosting mode; when the battery needs to be heated, the vehicle is controlled to work in the battery heating mode.

[0063] In the present application, the non-boosting mode (i.e. the economic mode), the boosting mode (i.e. the sport mode) and the battery heating mode can be divided, and finally the opening and closing control of the relays (i.e. K1 and K2) is implemented by the BMS 301 under the information interaction of the vehicle controller 11, the motor controller 4, the boosting controller and the BMS 301, and the specific modes are referred to Table 1 below:

[0064] Table 1

[0065]

[0066] In addition, the present application also provides a vehicle, which comprises a driving motor 8, a transmission system 9, a wheel 10 and the above vehicle boosting control system, the motor controller 4 is connected to the driving motor 8, and the driving motor 8 is mechanically connected to the transmission system 9 and the wheel 10.

[0067] Those skilled in the art can understand that the battery management system 301, the vehicle controller 11, the motor controller 4, the boosting controller and the like in the present application are all control devices, such as Figure 6 As shown in FIG. 6, which is a structural schematic diagram of a control device provided in the sixth embodiment of the present application, and the control device in this Figure 6 is only an example of the control device, and does not constitute a limitation on the control device, and the control device can include more or fewer components than those shown, or combine certain components, or different components.

[0068] The processor can be a CPU, and can also be 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 device, discrete gate or transistor logic, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0069] The memory includes a readable storage medium, an internal memory, etc., where the internal memory can be a memory of the computer device, and the internal memory provides an environment for running the operating system and the computer-readable instructions in the readable storage medium. The readable storage medium can be a hard disk of the computer device, and in other embodiments, can also be an external storage device of the computer device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. Further, the memory can include both the internal storage unit of the computer device and the external storage device. The memory is used to store the operating system, application programs, a BootLoader, data, and other programs, such as program codes of computer programs, etc. The memory can also be used to temporarily store data that has been output or will be output.

[0070] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0071] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0072] In the embodiments provided by the present application, it should be understood that the disclosed apparatus / control device and method can be implemented in other manners. For example, the embodiments of the apparatus / control device described above are merely illustrative. For example, the division of the modules or units can be different, and each can contain a plurality of sub-units. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between the units can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or in other forms.

[0073] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0074] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

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

2. The vehicle control circuit of claim 1, wherein, A first switch is provided on the direct connection branch, and a second switch is provided on the booster branch. When the booster is working, the first switch is off and the second switch is closed. When the booster is not working, the first switch is closed and the second switch is off.

3. The vehicle control circuit of claim 2, wherein, The control terminals of both the first and second switches are used to connect to the vehicle battery management system to perform shut-off or shut-off actions based on the control commands of the battery management system.

4. The vehicle control circuit of claim 1, wherein, The boost converter includes a boost controller, an inductor, a first switching transistor, a second switching transistor, and a first capacitor; The inductor and the first switching transistor are sequentially arranged on the connection line between the positive terminal of the vehicle battery and the positive terminal of the vehicle motor controller. One end of the second switching transistor is connected to the line between the inductor and the first switching transistor, and the other end of the second switching transistor is connected to the connection line between the negative terminal of the battery and the negative terminal of the vehicle motor controller. One end of the first capacitor is connected to the connection line between the first switching transistor and the positive terminal of the vehicle motor controller, and the other end of the capacitor is connected to the connection line between the second switching transistor and the negative terminal of the vehicle motor controller. The control terminals of both the first and second switching transistors are connected to the boost controller to realize the switching control of the first and second switching transistors.

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

6. The vehicle control circuit of claim 5, wherein, The signal line is the vehicle's controller area network bus.

7. The vehicle control circuit of claim 4, wherein, Both the first and second switching transistors are N-channel enhancement-mode MOSFETs.

8. The vehicle control circuit according to any one of claims 1 to 7, characterized by A second capacitor is provided between the boost branch and the direct connection branch.

9. A vehicle boost control system characterized by, The device 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 boost converter is connected to the battery, the secondary side of the boost converter is connected to the motor controller, one end of the direct connection branch is connected to the battery, and the other end of the direct connection branch is connected to the motor controller.

10. The vehicle boost control system of claim 9, wherein The vehicle boost control system controls the vehicle to work in one of a boost mode, a non-boost mode and a battery heating mode, wherein the vehicle is controlled to work in the boost mode when the motor efficient working voltage is higher than the battery pack voltage or in the motion mode; the vehicle is controlled to work in the non-boost mode when the motor efficient working voltage is not higher than the battery pack voltage or in the economic mode; and the vehicle is controlled to work in the battery heating mode when the battery needs to be heated.

11. A vehicle characterized by comprising: A vehicle comprising a driving motor and a vehicle boost control system as claimed in claim 9 or 10, wherein the motor controller is connected to the driving motor.

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