Wading water-proof control system and method for electric automobile

Abstract

The invention discloses a wading water-proof control system and method for an electric automobile. The control system comprises a ventilation frame. The control system further comprises a control unit and an air pressure control module. The control unit is connected to the ventilation frame through the electric driving module, and the ventilation frame is driven by the electric driving module to be opened and closed. The output end of the control unit is connected to the air pressure control module, and the air pressure control module is used for controlling air pressure in the vehicle to prevent water from entering; the control unit controls the working states of the ventilation frame and the air pressure control module according to the current vehicle wading state. The device has the advantages that water is prevented from entering the vehicle in an air pressure mode through cooperative control of ventilation and an air conditioner in the vehicle during slight wading, and water entering the vehicle during wading is reduced or avoided.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle electrical control, and in particular to a control system and method for realizing water intrusion prevention of electric vehicles based on electrical control. Background Art

[0002] Electric vehicles are high-voltage systems, which include high-voltage components such as battery packs and 12V or 24V low-voltage component systems. Regardless of high-voltage or low-voltage systems, they need to consider the safety risks caused by water ingress. In the prior art, electric vehicles have a need for light wading during the rainy season. In order to ensure the safety and reliability of electric vehicles and avoid safety hazards such as electrical short circuits caused by water ingress, the solution commonly used in the prior art is to increase the waterproof sealing design of the electrical system and solve the risk of water ingress through waterproof designs such as sealing. For example, a waterproof electric vehicle motor controller with patent application number 201621355037.7 uses a double waterproof structure between the controller cover and the base plate and between the controller cover and the connecting column, which greatly improves the waterproof effect of the electric vehicle motor controller.

[0003] The waterproofing with sealing design can solve the waterproofing problem to a certain extent. However, waterproofing design is generally carried out for important parts such as battery packs. However, due to the poor sealing of the vehicle and the existence of various assembly gaps, water ingress has little impact on electrical equipment that has been waterproofed, but it will also cause safety risks for electrical equipment and even some wires that have not been waterproofed. For example, when driving on a flooded road in the city, there will be a risk of rainwater entering the vehicle when the electric vehicle is driving (especially for older vehicles with poor sealing), and the vehicle will cause damage to the electronic equipment, line plug-ins and interior decoration in the vehicle after water ingress. Even if the electrical appliances are not affected in the short term, they cannot be quickly air-dried after water ingress, which will also cause damage to the interior decoration parts and damage and aging of the wiring harness in a humid environment for a long time, and the repair cost after water ingress is very high and cumbersome. The existing technology can effectively solve the water ingress problem by sealing, but it belongs to the sealing control of the structure. When it is impossible to achieve 100% sealing, how to reduce or even avoid water ingress during slight wading is what the vehicle electrical control needs to consider. The existing technology only uses a sealing structure for waterproofing and cannot meet the needs. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an electric vehicle wading water prevention control system and method, which can prevent water from entering the vehicle by means of air pressure through coordinated control of the ventilation and air conditioning in the vehicle when the vehicle is slightly wading, thereby reducing or avoiding water from entering the vehicle when wading.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a water-proof control system for electric vehicles, the control system includes a ventilation frame; the control system also includes a control unit and an air pressure control module; the control unit is connected to the ventilation frame through an electric drive module, and the ventilation frame is driven to open and close through the electric drive module; the output end of the control unit is connected to the air pressure control module, and the air pressure control module is used to control the air pressure in the vehicle to prevent water from entering; the control unit controls the working states of the ventilation frame and the air pressure control module respectively according to the current wading state of the vehicle.

[0006] The control unit is connected to a wading state trigger module, and the control unit determines whether the current state is wading according to a signal from the wading state trigger module.

[0007] The wading state trigger module includes a manual trigger module and / or an automatic trigger module; wherein the manual trigger module is controlled by a user; the automatic trigger module automatically determines the wading state according to the detected data, and the manual trigger module and the automatic trigger module are both connected to a control unit.

[0008] The control system also includes an in-vehicle air pressure sensor, which is used to collect in-vehicle air pressure data and has an output end connected to the control unit; the control unit controls the working state of the air pressure control module according to the in-vehicle air pressure data, so that the in-vehicle air pressure is maintained within a set range when the vehicle is wading.

[0009] The control system also includes a wading water depth sensor, which is used to detect wading water depth data, and its output end is connected to a control unit. The control unit adjusts the set range of air pressure maintenance based on the water depth value and controls the working state of the air pressure control module based on the set range of air pressure.

[0010] A water ingress prevention control method for an electric vehicle determines whether to enter a wading mode according to the current wading state of the vehicle, closes a ventilation frame after entering the wading mode, and simultaneously pressurizes the interior of the vehicle so that the air pressure inside the vehicle is higher than the air pressure outside the vehicle, thereby preventing water from entering the vehicle through the air pressure.

[0011] After entering the wading mode, the air-conditioning mode is adjusted to external circulation through the air-conditioning controller, and the blower is turned on to increase the air pressure in the car.

[0012] The entry into the wading mode includes manual trigger entry and / or automatic trigger entry. The wading mode switch is used to manually trigger the entry into the wading mode. The wading state is automatically determined based on the detected data and a trigger signal is output to automatically trigger the entry into the wading mode.

[0013] After entering the water wading mode, the blower is controlled to run at the maximum speed to achieve a rapid increase in the air pressure inside the car. The air pressure inside the car is collected in real time, and the speed of the blower is used to adjust the air pressure inside the car to be within the preset air pressure range.

[0014] After the end conditions of the wading mode are met, the wading mode is exited. At this time, the ventilation frame is opened, and the air conditioning circulation mode and the blower working state are restored to the state before the wading mode is entered through the air conditioning controller.

[0015] The advantages of the present invention are as follows: in case of slight wading, the ventilation and air conditioning in the vehicle are coordinated and controlled to block water from entering the vehicle in the form of air pressure, thereby reducing or avoiding water ingress into the vehicle when wading; water ingress prevention is controlled only by the vehicle's hardware, and the components in the vehicle are reused, which is low in cost and easy to implement; waterproofing is achieved by combining control strategies on the basis of existing sealing, and double waterproofing and water ingress protection is provided, thereby improving the reliability of vehicle water ingress prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0017] Figure 1 The electrical structure principle diagram of the control system of the present invention;

[0018] Figure 2 This is a flow chart of the control method of the present invention.

[0019] The markings in the above figures are: 1. VCU (built-in air pressure sensor), 2. Air conditioning controller, 3. Wading mode switch, 4. Ventilation frame (with electric valve), 5. Air conditioning assembly, 6. External circulation motor 7. Blower motor. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0021] In view of the poor sealing effect or the deterioration of the sealing due to the long time, after the vehicle wades, water may enter the vehicle through the gaps with poor sealing. In order to solve this technical problem, this solution uses the air pressure blocking method. By pressurizing the vehicle when wading, the air pressure inside the vehicle is greater than that outside the vehicle, so as to prevent the risk of water entering the vehicle when wading. The specific solution is introduced as follows:

[0022] like Figure 1 As shown, the present embodiment provides an electric vehicle water wading and water ingress prevention control system, which includes a ventilation frame, a control unit, and an air pressure control module; wherein the control unit is used to implement the water wading control function, and it is used as a main controller to implement control, and is integrated in the vehicle or integrated in the vehicle controller in the form of software to achieve multiplexing. In the present embodiment, the vehicle controller VCU is used to achieve multiplexing.

[0023] The ventilation frame is electrically controlled, that is, the ventilation frame is opened and closed through electric valves, etc. The control unit is connected to the ventilation frame through an electric drive module, and the ventilation frame is driven to open and close through the electric drive module;

[0024] The output end of the control unit is connected to the air pressure control module, which is used to control the air pressure in the vehicle to prevent water from entering; the air pressure control module is used to adjust the air pressure in the vehicle by increasing it, including pressure control according to the control signal of the control unit.

[0025] The control unit controls the working states of the ventilation frame and the air pressure control module respectively according to the current wading state of the vehicle, thereby realizing anti-water ingress control under wading.

[0026] Its working principle is as follows: a wading mode is pre-set in the vehicle controller VCU, and whether to enter the wading mode is determined according to the current wading state of the vehicle. After entering the wading mode, the VCU closes the ventilation frame through electric adjustment, and at the same time pressurizes the interior of the vehicle through the air pressure control module to make the air pressure inside the vehicle higher than the air pressure outside the vehicle, and uses air pressure to prevent water from entering the vehicle. After entering the wading mode, it means that there is a risk of water ingress. Generally, water enters the vehicle through gaps that are not strictly sealed. Therefore, in order to avoid or reduce water ingress, the air pressure inside the vehicle is increased so that the air pressure inside the vehicle is higher than the air pressure outside the vehicle and higher than a certain threshold. In this way, the air pressure inside the vehicle is maintained higher than the air pressure outside the vehicle, and the gas will be emitted to the outside of the vehicle through gaps that are not strictly sealed. When wading, the existence of air pressure will prevent water from entering the vehicle, thereby achieving the purpose of preventing water ingress.

[0027] In this embodiment, the air pressure control module is implemented by a vehicle air conditioning system, wherein the output end of the vehicle controller VCU is connected to the air conditioning controller. After entering the wading mode, the VCU outputs a control signal to the air conditioning controller. The VCU controls the circulation mode of the air conditioning to open to the external circulation through the air conditioning controller, and controls the blower to start working to blow air into the vehicle, thereby achieving pressurization in the vehicle. Before the VCU controls the air conditioning controller to open the external circulation and the blower to work, the current circulation mode and the blower working state are recorded and stored, so as to facilitate rapid recovery to the initial state after the wading mode ends.

[0028] The control unit is connected to the wading state trigger module, and the control unit determines whether the vehicle is currently in the wading state according to the signal of the wading state trigger module. The wading state trigger module includes a manual trigger module and / or an automatic trigger module; wherein the manual trigger module is controlled by the user; the automatic trigger module automatically determines the wading state according to the detected data, and both the manual trigger module and the automatic trigger module are connected to the control unit.

[0029] The wading mode can be turned on and off manually or automatically, where:

[0030] When the wading mode is manually triggered, the wading switch is used to turn the wading mode on and off. The wading switch can be a hard switch or a soft switch, which is set in the center console or the touch screen of the multimedia host. The user can turn on or off the wading switch according to the current wading state, thereby turning the wading mode on and off. After turning on the wading switch mode, the ventilation frame (exhaust device) on the electric vehicle adopts an electric structure (closed by an electric valve, exhaust is prohibited), a wading mode switch is set at the dashboard position in the car, and the VCU has a built-in air pressure sensor. When water is found on the road, the driver can turn on the wading mode switch (the indicator light is on), and the VCU (vehicle controller) closes the electric valve of the ventilation frame after receiving the wading switch signal. At the same time, the VCU sends a command to the air conditioning controller to turn on the external circulation, turn on the blower, and pressurize the car. When the car is wading, the air pressure in the car will be exhausted to the outside of the car through the poorly sealed position, which can avoid or slow down the entry of rainwater into the car through the poorly sealed position, and can effectively avoid or reduce the inconvenience and high maintenance costs caused by water ingress to the car. This method can solve or reduce the problem of rainwater entering the electric vehicle when it is driving on a flooded road, thereby improving driving safety.

[0031] The automatic trigger module mainly detects the vehicle's water ingress status data, and based on this determines whether it is necessary to trigger the wading mode. The water immersion sensors and water level sensors set in reasonable positions such as the vehicle chassis or front bumper are used to detect whether the current vehicle is at risk of water immersion, so as to determine whether it is necessary to issue a control signal to trigger the wading mode. When water immersion or the water level reaches the set value through the water immersion sensor or the water level sensor, it is judged that there is a risk of water ingress, and the water immersion mode is activated at this time.

[0032] In a preferred solution of this embodiment, an air pressure sensor is provided in the vehicle, and the air pressure sensor is used to collect air pressure data in the vehicle, and its output end is connected to the control unit; the control unit controls the working state of the air pressure control module according to the air pressure data in the vehicle, so that the air pressure in the vehicle is kept within a set range when the vehicle is wading. The air pressure sensor is used to collect the air pressure in the vehicle in real time, because if the air pressure in the vehicle is too high, the driver or passengers will feel uncomfortable, and if the air pressure is too low, it will be impossible to prevent water from entering the vehicle. Therefore, it is necessary to control the air pressure in the vehicle within a reasonable range. This air pressure setting range can be pre-calibrated to meet the comfort of the people in the vehicle and prevent water from entering the vehicle to the maximum extent.

[0033] The air pressure setting range includes an upper pressure limit and a lower pressure limit. The upper pressure limit is set to 1200hPa and the lower pressure limit is set to 1150hPa. After entering the wading mode, the control principle is as follows:

[0034] When an electric vehicle encounters a flooded road section while driving, the driver turns on the wading mode switch on the dashboard, and the switch indicator light is on. The VCU drives the electric valve of the ventilation frame on the vehicle to prohibit the exhaust of air inside the vehicle to the outside of the vehicle. At the same time, it sends a command to the air conditioning controller to turn on the air conditioning external circulation and turn on the maximum speed of the blower to increase the air pressure inside the vehicle. At this time, the car can wade. The air inside the car is exhausted to the outside of the car through the position of the sealing difference under the pressure. The exhaust outside can offset or reduce the leakage of rainwater outside the car into the car. After the wading mode is turned on, the VCU monitors the air pressure inside the car in real time. When the air pressure inside the car reaches the upper limit of 1200hPa (the upper limit of the air pressure can be calibrated), the VCU sends a command to the air conditioning controller to adjust the blower speed to reduce the air pressure inside the car. When the air pressure inside the car reaches the lower limit of 1150hPa (the lower limit of the air pressure can be calibrated), the VCU sends a command to the air conditioning controller to adjust the blower speed to increase the air pressure inside the car. By adjusting the speed of the blower, the air pressure inside the car is always kept within a certain pressure range. When the car passes through a flooded section of road, the driver turns off the wading mode switch, the indicator light goes out, and the VCU drives the electric valve of the ventilation frame on the vehicle to open the exhaust channel. At the same time, it sends a command to the air-conditioning controller to turn off the blower, and the work is completed.

[0035] In a preferred solution of the present embodiment, the control system further includes or is provided with a wading depth sensor, which is used to detect wading depth data, and its output end is connected to the control unit, and the control unit adjusts the setting range of air pressure maintenance based on the water depth value and controls the working state of the air pressure control module based on the setting range of air pressure. Due to different wading depths, the pressure of water entering the vehicle through the gaps in the vehicle chassis and the like is different, so it is necessary to maintain different air pressures in the vehicle, so as to adapt to different wading depths and avoid that the same air pressure setting range cannot meet the requirements of fine control to block water ingress. Since the deeper the wading depth, the greater the water pressure, the greater the pressure of water entering the vehicle, at this time, it is required that no water enter the vehicle or less water enters, and the air pressure in the vehicle needs to be increased. Therefore, the upper and lower limits of the air pressure setting range are dynamically adjusted according to the wading depth, so as to better meet the requirements of preventing water ingress in different wading situations, and then the water outside the vehicle is blocked from infiltrating into the vehicle according to the set air pressure.

[0036] The preset calibration sets the upper and lower limits of the basic air pressure corresponding to the shallowest wading depth, and the values ​​of the upper and lower limits of the basic air pressure are stored in the VCU. When the wading depth is detected to be below the shallowest water depth, the upper and lower limits of the basic air pressure are used as the set air pressure range to control the air pressure in the vehicle; when the wading depth is detected to be greater than the shallowest wading depth, the upper and lower limits of the basic air pressure are adjusted according to the value of the wading depth, so as to match the requirements of different wading depths, thereby meeting the need to prevent water from entering the vehicle. The threshold comparison table for the pressure increase corresponding to different wading depths can be pre-calibrated, and the adjusted value can be obtained through the water depth. The adjusted value is superimposed on the upper and lower limits of the basic air pressure to obtain the adjusted upper and lower limits of the air pressure as the set air pressure range, thereby meeting the requirements for preventing water from entering the vehicle.

[0037] The main principle of preventing water ingress in this scheme is that the air pressure inside and outside is different. If the air pressure inside the car is high, the air pressure will be applied to the outside of the car at the gap that is not tightly sealed, and the gas will be released outward along the gap to prevent water from entering the car. After the wading switch is turned off by the manual switch or after the wading is completed by automatic detection, the wading mode will be turned off after a delay of T minutes. The purpose of this is to prevent the water attached to the car from slowly seeping in, and secondly, because the air pressure inside the car is significantly higher than the air pressure outside the car, a strong airflow will be generated at the gap, and the water stains that may enter the car at the gap will be taken away to the outside of the car by the strong air pressure, thereby minimizing the risk of water entering the car. At the same time, due to the delayed closure of the wading mode, the possible water stains that may enter the car can be further taken away to the outside of the car by the strong airflow, reducing the entry of water stains in the car. The delay time T of the wading mode is set according to the running time of the wading mode, wherein the longer the running time of the wading mode is, the longer the delay time T is. The comparison relationship between the running time of the wading mode and the delay time T is pre-calibrated. When the signal to close the wading mode is received, the wading mode is closed after the delay time T.

[0038] After the end condition of the wading mode is met, the wading mode is exited after a delay of time T. After the delay reaches the time threshold T, the wading mode is turned off, the ventilation frame is opened, and the air conditioning circulation mode and the blower working state are restored to the state before the wading mode is entered through the air conditioning controller. Because the state information of the air conditioning blower and the circulation mode is recorded before entering the wading mode, the state information before the wading mode is turned on can be directly read, and then the recovery program can be executed to restore to the previous state.

[0039] In this embodiment, a method for preventing water ingress in an electric vehicle is also provided, which determines whether to enter the wading mode according to the current wading state of the vehicle. After entering the wading mode, the ventilation frame is closed and the interior of the vehicle is pressurized so that the air pressure inside the vehicle is higher than the air pressure outside the vehicle, thereby preventing water from entering the vehicle through the air pressure.

[0040] After entering the wading mode, the air-conditioning mode is adjusted to external circulation through the air-conditioning controller, and the blower is turned on to increase the air pressure in the car.

[0041] The entry into the wading mode includes manual trigger entry and / or automatic trigger entry. The wading mode switch is used to manually trigger the entry into the wading mode. The wading state is automatically determined based on the detected data and a trigger signal is output to automatically trigger the entry into the wading mode.

[0042] After entering the water ingress and wading mode, the blower is controlled to run at the maximum speed to achieve a rapid increase in the air pressure inside the car. The air pressure inside the car is collected in real time, and the air pressure inside the car is adjusted to be within the preset air pressure range through the speed of the blower. Running at the maximum speed first is a way to achieve a rapid increase in the car, avoiding the risk of water ingress after wading due to a slow increase rate. The rapid increase makes the air pressure inside the car greater than the outside of the car to reduce the possibility of water ingress, and can even avoid water ingress. Therefore, after entering the wading mode, the blower is first controlled to run at the maximum power and maximum speed to quickly reach the set air pressure inside the car. After reaching the air pressure inside the car, the air pressure inside the car is adjusted according to the upper and lower limits of the air pressure to meet the purpose of the air pressure inside the car being greater than the air pressure outside the car, reducing the risk of water ingress when wading.

[0043] The main principle of preventing water ingress in this scheme is that the air pressure inside and outside is different. If the air pressure inside the car is high, the air pressure will be applied to the outside of the car at the gap that is not tightly sealed, and the gas will be released outward along the gap to prevent water from entering the car. After the wading switch is turned off by the manual switch or after the wading is completed by automatic detection, the wading mode will be turned off after a delay of T minutes. The purpose of this is to prevent the water attached to the car from slowly seeping in, and secondly, because the air pressure inside the car is significantly higher than the air pressure outside the car, a strong airflow will be generated at the gap, and the water stains that may enter the car at the gap will be taken away to the outside of the car by the strong air pressure, thereby minimizing the risk of water entering the car. At the same time, due to the delayed closure of the wading mode, the possible water stains that may enter the car can be further taken away to the outside of the car by the strong airflow, reducing the entry of water stains in the car. The delay time T of the wading mode is set according to the running time of the wading mode, wherein the longer the running time of the wading mode is, the longer the delay time T is. The comparison relationship between the running time of the wading mode and the delay time T is pre-calibrated. When the signal to close the wading mode is received, the wading mode is closed after the delay time T.

[0044] After the end condition of the wading mode is met, the wading mode is exited after a delay of time T. After the delay reaches the time threshold T, the wading mode is turned off, the ventilation frame is opened, and the air conditioning circulation mode and the blower working state are restored to the state before the wading mode is entered through the air conditioning controller. Because the state information of the air conditioning blower and the circulation mode is recorded before entering the wading mode, the state information before the wading mode is turned on can be directly read, and then the recovery program can be executed to restore to the previous state.

[0045] In a preferred solution of the present embodiment, the control system further includes or is provided with a wading depth sensor, which is used to detect wading depth data, and its output end is connected to the control unit, and the control unit adjusts the setting range of air pressure maintenance based on the water depth value and controls the working state of the air pressure control module based on the setting range of air pressure. Due to different wading depths, the pressure of water entering the vehicle through the gaps in the vehicle chassis and the like is different, so it is necessary to maintain different air pressures in the vehicle, so as to adapt to different wading depths and avoid that the same air pressure setting range cannot meet the requirements of fine control to block water ingress. Since the deeper the wading depth, the greater the water pressure, the greater the pressure of water entering the vehicle, at this time, it is required that no water enter the vehicle or less water enters, and the air pressure in the vehicle needs to be increased. Therefore, the upper and lower limits of the air pressure setting range are dynamically adjusted according to the wading depth, so as to better meet the requirements of preventing water ingress in different wading situations, and then the water outside the vehicle is blocked from infiltrating into the vehicle according to the set air pressure.

[0046] The preset calibration sets the upper and lower limits of the basic air pressure corresponding to the shallowest wading depth, and the values ​​of the upper and lower limits of the basic air pressure are stored in the VCU. When the wading depth is detected to be below the shallowest water depth, the upper and lower limits of the basic air pressure are used as the set air pressure range to control the air pressure in the vehicle; when the wading depth is detected to be greater than the shallowest wading depth, the upper and lower limits of the basic air pressure are adjusted according to the value of the wading depth, so as to match the requirements of different wading depths, thereby meeting the need to prevent water from entering the vehicle. The threshold comparison table for the pressure increase corresponding to different wading depths can be pre-calibrated, and the adjusted value can be obtained through the water depth. The adjusted value is superimposed on the upper and lower limits of the basic air pressure to obtain the adjusted upper and lower limits of the air pressure as the set air pressure range, thereby meeting the requirements for preventing water from entering the vehicle.

[0047] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A water ingress prevention control system for electric vehicles, the control system comprising a ventilation frame; characterized in that: The control system also includes a control unit and an air pressure control module; the control unit is connected to the ventilation frame through an electric drive module, and the ventilation frame is driven to open and close through the electric drive module; the output end of the control unit is connected to the air pressure control module, and the air pressure control module is used to control the air pressure in the vehicle to prevent water from entering; the control unit controls the working states of the ventilation frame and the air pressure control module respectively according to the current wading state of the vehicle.

2. The electric vehicle water intrusion prevention control system according to claim 1, characterized in that: The control unit is connected to a wading state trigger module, and the control unit determines whether the current state is wading according to a signal from the wading state trigger module.

3. The electric vehicle water intrusion prevention control system as claimed in claim 2, characterized in that: The wading state trigger module includes a manual trigger module and / or an automatic trigger module; wherein the manual trigger module is controlled by a user; the automatic trigger module automatically determines the wading state according to the detected data, and the manual trigger module and the automatic trigger module are both connected to a control unit.

4. An electric vehicle wading and water ingress prevention control system as claimed in any one of claims 1 to 3, characterized in that: The control system also includes an in-vehicle air pressure sensor, which is used to collect in-vehicle air pressure data and has an output end connected to the control unit; the control unit controls the working state of the air pressure control module according to the in-vehicle air pressure data, so that the in-vehicle air pressure is maintained within a set range when the vehicle is wading.

5. The electric vehicle water intrusion prevention control system as claimed in claim 4, characterized in that: The control system also includes a wading water depth sensor, which is used to detect wading water depth data, and its output end is connected to a control unit. The control unit adjusts the set range of air pressure maintenance based on the water depth value and controls the working state of the air pressure control module based on the set range of air pressure.

6. A water ingress prevention control method for electric vehicles, characterized in that: Whether to enter the wading mode is determined based on the current wading status of the vehicle. After entering the wading mode, the ventilation frame is closed and the interior of the vehicle is pressurized so that the air pressure inside the vehicle is higher than the air pressure outside the vehicle, thereby preventing water from entering the vehicle through air pressure.

7. A water ingress prevention control method for electric vehicles as claimed in claim 6, characterized in that: After entering the wading mode, the air-conditioning mode is adjusted to external circulation through the air-conditioning controller, and the blower is turned on to increase the air pressure in the car.

8. The electric vehicle wading water prevention control method as claimed in claim 6, characterized in that: The entry into the wading mode includes manual trigger entry and / or automatic trigger entry. The wading mode switch is used to manually trigger the entry into the wading mode. The wading state is automatically determined based on the detected data and a trigger signal is output to automatically trigger the entry into the wading mode.

9. A water ingress prevention control method for electric vehicles as claimed in any one of claims 6 to 7, characterized in that: After entering the water wading mode, the blower is controlled to run at the maximum speed to achieve a rapid increase in the air pressure inside the car. The air pressure inside the car is collected in real time, and the speed of the blower is used to adjust the air pressure inside the car to be within the preset air pressure range.

10. A water ingress prevention control method for electric vehicles as claimed in any one of claims 6 to 7, characterized in that: After the end conditions of the wading mode are met, the wading mode is exited. At this time, the ventilation frame is opened, and the air conditioning circulation mode and the blower working state are restored to the state before the wading mode is entered through the air conditioning controller.

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