Control method for wireless charging of electric vehicle

Abstract

The invention discloses a control method for wireless charging of an electric vehicle, which comprises the following steps of: detecting whether the current vehicle is in a wireless charging area or not in real time through a vehicle-mounted wireless charging module, and when the vehicle is detected to enter the wireless charging area, sending a reminding signal through a vehicle-mounted large screen to remind the area where the current vehicle is located. The method has the advantages that reminding, control and interaction in the wireless charging process are achieved through interaction control, and the accuracy of starting control of wireless charging and the experience feeling of a user during wireless charging are effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle charging control, and in particular to a control method for wireless charging of an electric vehicle. Background Art

[0002] The development of electric vehicle charging technology has evolved from wired charging to wireless charging. Wireless charging starts charging after the vehicle reaches a specific location at a charging station. Electromagnetic induction is performed between the wireless charging module in the vehicle and the wireless charging coil in the charging station to transfer electrical energy from the charging station to the vehicle, thereby charging the vehicle.

[0003] For example, the wireless charging system, wireless charging station wireless charging method and electric vehicle charging method with patent application number 202310698008.9 include: multiple wireless charging transmitters, which are arranged in the wireless charging station, and the wireless charging transmitter receives a charging preparation request from an electric vehicle, guides the electric vehicle to the available position of the wireless charging transmitter, obtains charging matching parameters corresponding to the charging request based on the charging request, and wirelessly charges the electric vehicle based on the charging matching parameters; a wireless charging receiving device, which is arranged on the electric vehicle and is communicatively connected to the available wireless charging transmitter.

[0004] The wireless charging solution disclosed in the aforementioned patent enables each charging device to provide wireless charging services for different electric vehicles, thereby improving the utilization rate of wireless charging stations. However, existing wireless charging technologies often require user cooperation for charging control. Existing technologies lack prompts and interaction when a vehicle enters a wireless charging station, and are unable to effectively provide prompts and interaction when the user performs wireless charging operations. This can lead to wireless charging failures due to improper user operation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a control method for wireless charging of electric vehicles. Through interactive control, reminders, control and interaction of the wireless charging process are realized, effectively improving the accuracy of the startup control of wireless charging and the user experience when performing wireless charging.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a control method for wireless charging of electric vehicles, comprising: using an on-board wireless charging module to detect in real time whether the current vehicle is in a wireless charging area; when it is detected that the vehicle enters the wireless charging area, a reminder signal is sent through the on-board large screen to indicate the current area where the vehicle is located.

[0007] When a vehicle is detected to have entered the wireless charging area and the on-board wireless charging module and the wireless charging module of the charging station are not aligned successfully, the on-board large screen will send a reminder signal that the vehicle has entered the wireless charging area through a pop-up window.

[0008] After detecting that the vehicle has entered the wireless charging area, it checks in real time whether the on-board wireless charging module and the wireless charging module of the charging station are successfully aligned; when the alignment is successful and there is no charging fault in the BMS, the vehicle and the charging station are in a state where charging is allowed, and the vehicle's wireless charging function is on, the on-board large screen is controlled to remind the driver to shift into P gear for wireless charging through a pop-up window.

[0009] When a pop-up window reminds the driver to shift into P gear for wireless charging, the vehicle's gear status is monitored in real time. When the vehicle gear is in P gear, the pop-up interface disappears and the wireless charging process begins.

[0010] After entering the wireless charging process, a waiting charging instruction is sent to the on-board wireless charging module, and then it is detected whether the charging permission conditions are met. When the charging permission conditions are met, a charging permission instruction is sent to the BMS and the on-board wireless charging module.

[0011] Conditions under which charging is permitted include:

[0012] a) The gear position is P;

[0013] b) Faults related to vehicle charging;

[0014] c) The vehicle speed is 0;

[0015] d) The wireless charging function is turned on;

[0016] When all the conditions for allowing charging are met, a charging permission instruction is issued.

[0017] After receiving the wireless charging permission instruction from the VCU, the BMS sends a request for charging voltage and current to the on-board wireless charging module. The on-board wireless charging module responds to the BMS's request for charging voltage and current and starts wireless charging to charge the battery pack.

[0018] After starting wireless charging to charge the battery pack, the temperature data of the battery pack during the charging process is monitored in real time. When the temperature is higher than the set temperature threshold, the on-board wireless charging module sends a cooling request instruction to the thermal management controller TMM, and the TMM drives the water pump and cooling fan to turn on to achieve temperature reduction.

[0019] When the set charging completion conditions are met, the BMS requests the charging voltage and charging current to be set to 0, and feeds back the wireless charging completion to the VCU. The VCU sends a wireless charging permission signal to prohibit; the wireless charging module responds to the voltage and current request of the BMS, and the charging voltage and charging current are set to 0; if the current power gear is OFF, the high-voltage power-off process is executed, and the entire vehicle enters sleep within the set time. If the current power gear is ON, the high-voltage connection is maintained.

[0020] During the charging process, the VCU monitors the vehicle's charging conditions in real time. When the charging conditions are not met or charging is completed, the VCU issues a command to prohibit wireless charging and ends wireless charging.

[0021] The advantages of the present invention are: through interactive control, reminders, control and interaction of the wireless charging process are realized, which effectively improves the accuracy of the startup control of wireless charging and the user experience when performing wireless charging; through interactive control, the purpose of guiding users to perform wireless charging is achieved, the interactive guidance is more reasonable, and the user experience is improved; further, after the wireless charging is started, the control strategy is used to improve the charging efficiency and reduce the charging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents and symbols in the drawings of the present invention:

[0023] Figure 1 This is a diagram of the charging control system architecture corresponding to the wireless charging control method of the present invention.

[0024] The reference numerals in the figure are: 1. Wireless charging module; 2. Battery management system; 3. Vehicle controller; 4. Large screen of vehicle computer; 5. Electronic parking module; 6. Body domain controller; 7. DCDC converter; 8. Thermal management controller. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further explained in detail below by describing the best embodiment with reference to the accompanying drawings.

[0026] The wireless charging control method of this embodiment includes two parts: the vehicle side and the charging station side; the vehicle side is provided with a wireless charging module; the charging station side is provided with a wireless charging coil and its control system; the traditional wireless charging method is relatively lacking in wireless charging reminders. After the driver arrives at the wireless charging area, he cannot know how to control the vehicle, resulting in a lack of interactive measures for wireless charging. This embodiment provides interactive reminders of the vehicle to realize interaction with the user during the wireless charging process, improve the wireless charging experience, provide guidance for the user when entering the wireless charging, and reduce the occurrence of wireless charging failures.

[0027] like Figure 1As shown, the wireless charging control method in this embodiment is implemented based on a wireless charging control system. The wireless charging control system includes a wireless charging module, a battery management system, a vehicle controller, a large screen on the vehicle, an electronic parking module, a body domain controller, a DC-DC converter, and a thermal management controller. The wireless charging module is located on the vehicle and is connected to the vehicle controller (VCU), the battery management system (BMS), the large screen on the vehicle (IHU), and the thermal management controller (TMM). The on-board wireless charging module (WPT-VA) is connected to the TMM and is used to send cooling request instructions and temperature data to the TMM. The TMM drives thermal management actuators such as the water pump on or off based on the received request temperature, thereby achieving cooling and heating control during the wireless charging process. The WPT-VA is connected to the BMS and is used to receive and execute corresponding signals from the BMS regarding charging voltage, current, wireless charging start status, and charging status during the wireless charging process, and send charging voltage and charging current signals to the BMS. The WPT-VA is connected to the IHU and is used to control the IHU to issue pop-up reminders, thereby implementing pop-up reminders for entering the charging area through the IHU and reminders for shifting into P gear for wireless charging. The WPT-VA interacts with the VCU to obtain the current vehicle speed information, the wireless charging function on and off status information, and feedback the working status of the wireless charging device to the VCU; the VCU is connected to the IHU, EPB, CEM, and CMDC respectively to realize human-computer interaction, control the EPB, obtain the EPB status, obtain the power gear, and other operations.

[0028] In response to the hardware system of the above-mentioned vehicle, this embodiment provides a control method for wireless charging of electric vehicles. It mainly uses pop-up windows to interact during the charging process to guide the driver to perform wireless charging, and at the same time executes corresponding wireless charging control according to the user's operation. Its control method strategy includes: using the on-board wireless charging module to detect in real time whether the current vehicle is in the wireless charging area. When the vehicle is detected to have entered the wireless charging area, a reminder signal is sent through the on-board large screen to indicate the current area of ​​the vehicle. Whether the vehicle has entered the wireless charging area is determined by detecting whether the current position is covered by the wireless charging coil. When entering the wireless charging area, the driver is required to drive slowly. Therefore, a pop-up window can be used to remind the driver that he is in the wireless charging area, thereby achieving effective wireless charging reminder. When the vehicle is detected to have entered the wireless charging area and the on-board wireless charging module and the wireless charging module of the charging station are not successfully aligned, the on-board large screen sends a reminder signal that the vehicle has entered the wireless charging area through a pop-up window.

[0029] After detecting that the vehicle has entered the wireless charging area, it checks in real time whether the on-board wireless charging module and the wireless charging module of the charging station are successfully aligned; when the alignment is successful and there is no charging fault in the BMS, the vehicle and the charging station are in a state where charging is allowed, and the vehicle's wireless charging function is on, the on-board large screen is controlled to remind the driver to shift into P gear for wireless charging through a pop-up window. After entering the wireless charging area, charging does not automatically begin immediately. Each wireless charging station uses a charging coil for each vehicle. Charging is only allowed after the vehicle is successfully aligned with one of the charging coils. Failure to do so will result in a significant gap between the vehicle and the charging coils at the charging station, preventing effective and reliable charging. Therefore, upon entering the charging area, the vehicle's onboard wireless charging module must be aligned with the charging coil at a specific location on the charging station in real time. Only after successful alignment will the next charging process begin. Each parking space at the wireless charging station has a corresponding wireless charging coil. Alignment is considered successful only when the vehicle enters that space. This can be achieved through various means, such as vehicle position sensing. Successful alignment only indicates that the vehicle's charging module and wireless charging coil are aligned. However, whether the vehicle can proceed to the next charging process requires a vehicle assessment to determine whether it meets the basic requirements for wireless charging. This requires determining whether the BMS has no charging faults, the vehicle and charging station are in a charging-permitted state, and the vehicle's wireless charging function is enabled. If so, the basic requirements for wireless charging are met, and a pop-up window prompts the user: "Push P gear to enable wireless charging." When a pop-up window reminds the driver to shift into P gear for wireless charging, the vehicle's gear status is monitored in real time. When the vehicle is in P gear, the pop-up window disappears and the wireless charging process begins. After entering the wireless charging process, the user does not need to do anything. The user can complete the user interaction part of this wireless charging by shifting into P gear according to the instructions. The remaining control strategies are automatically implemented by the in-vehicle control module. Specifically:

[0030] After entering the wireless charging process, a waiting charging instruction is sent to the on-board wireless charging module, and then it is detected whether the charging permission conditions are met. When the charging permission conditions are met, a charging permission instruction is sent to the BMS and the on-board wireless charging module.

[0031] Conditions under which charging is permitted include:

[0032] a) The gear position is P;

[0033] b) Faults related to vehicle charging;

[0034] c) The vehicle speed is 0;

[0035] d) The wireless charging function is turned on;

[0036] When all the conditions for allowing charging are met, a charging permission instruction is issued. Because wireless charging requires the vehicle to be stationary, fault-free, and the wireless charging function to be turned on, each condition needs to be judged before issuing the charging permission instruction. After receiving the wireless charging permission instruction, the on-board wireless charging module enters the preparation stage, waiting for the voltage and current required for wireless charging from the BMS before starting the wireless charging function. After receiving the wireless charging permission instruction from the VCU, the BMS sends a request for charging voltage and charging current to the on-board wireless charging module. The on-board wireless charging module responds to the BMS's request for charging voltage and charging current, starts wireless charging to charge the battery pack, and thus completes the wireless charging startup process.

[0037] After starting wireless charging to charge the battery pack, the temperature data of the battery pack during the charging process is monitored in real time. When the temperature is higher than the set temperature threshold, the on-board wireless charging module sends a cooling request instruction to the thermal management controller TMM. The TMM drives the water pump and cooling fan to start to achieve temperature reduction. The TMM controls the heat dissipation of the wireless charging coil, battery pack, etc.

[0038] After entering wireless charging, it is necessary to judge the wireless charging end conditions. When the wireless charging end conditions are met, the end and stop of the wireless charging function are controlled. Specifically, when the set charging completion conditions are reached, the BMS requests the charging voltage and charging current to be set to 0, and feedbacks the wireless charging completion to the VCU. The VCU sends a wireless charging permission signal to prohibit; the wireless charging module responds to the voltage and current request of the BMS, and the charging voltage and charging current are set to 0; if the current power gear is OFF, the high-voltage power-off process is executed, and the whole vehicle enters sleep within the set time. If the current power gear is ON, the high-voltage connection is maintained. During the charging process, the VCU monitors the vehicle's allowable charging conditions in real time. When the allowable charging conditions are not met or charging is completed, the VCU issues a prohibition wireless charging instruction to end wireless charging.

[0039] In a preferred solution of this embodiment, since the principle of wireless charging is electromagnetic induction between two coils, if there is a deviation between the facing positions of the two coils, the wireless charging power of the entire system will be low, and wireless charging at full power or high power cannot be achieved, resulting in a long wireless charging time and affecting the efficiency of wireless charging. In this application, the vehicle-mounted wireless charging module is fixed in the vehicle, and each charging position in the charging station is provided with a wireless charging coil and a wireless charging pile controller. The wireless charging coil is generally set underground or in other reasonable settings. In order to increase the charging power and achieve adjustability, in this embodiment, the wireless charging coil in the charging station is set to an adjustable mode. After wireless charging is turned on, the position of the wireless charging coil is adjusted and the wireless charging power at the vehicle end is counted. The position of the wireless charging coil is determined according to the power change.

[0040] The wireless charging coil in the charging station is generally called the transmitting coil, while the one on the vehicle is called the induction or receiving coil. To achieve adjustable transmission coils, they are mounted on a movable mechanism consisting of a horizontal X-axis movement mechanism and a horizontal Y-axis movement mechanism. These mechanisms adjust the transmission coil's horizontal X and Y directions. Typically, the transmitting coil is placed in the ground. Simply hollowing the ground and arranging the appropriate X and Y-axis movement mechanisms allows for movement of the transmitting coil. Movement of the transmitting coil can be achieved using a simple mechanical structure and a motor. A controller for wireless communication with the vehicle is set on one side of the charging station. After charging begins, the controller communicates with the vehicle VCU. The output end of the controller is connected to the moving mechanism, and the controller can control the moving mechanism to move in the XY vertical directions on the horizontal plane through the motor. After wireless charging starts, the VCU collects and calculates the power for charging the battery pack. At the same time, it sends an adjustment instruction, and the controller adjusts the position of the transmitting coil within the set moving range according to the instruction of the VCU. The VCU collects the charging power corresponding to each moving position within the set moving range in real time, finds the transmitting coil position with the largest charging power through calculation and comparison, and controls the transmitting coil to move to this position, thereby realizing the adjustment of the wireless charging power and achieving wireless charging control with maximum power.

[0041] like Figure 1 As shown, the wireless charging control method provided in this embodiment includes the following specific control steps:

[0042] 1. In the wireless charging area, after the vehicle-side device detects a valid wireless charging device, it sends an "entering wireless charging area" signal to the large screen, which is set to 1, to remind the user that a wireless charging device is currently available. When the vehicle moves away from the valid area, the "entering wireless charging area" signal is set to 0 and the pop-up window disappears.

[0043] If all of the following conditions are met, a pop-up window reminder a&b will be displayed on the large screen:

[0044] a) Enter the wireless charging area and the signal is valid

[0045] b) The vehicle-side device and the ground-side device are not aligned successfully (after successful alignment, a pop-up window will appear to remind you to shift to P gear for wireless charging, and the current pop-up window will not be needed)

[0046] 2. After the user drives the vehicle and successfully aligns it in the wireless charging area, the on-board wireless charging device detects that all of the following conditions are met: a&b&c&d

[0047] a) Successful alignment

[0048] b) BMS has no fault level that affects charging

[0049] c) Vehicle-side equipment and pile-side equipment are allowed to charge

[0050] d) Wireless charging is on

[0051] A pop-up window signal is sent to the user: "Put the car in P gear and start wireless charging"; after the large screen receives the pop-up window signal from the vehicle-mounted wireless charging device, a pop-up window will appear. After the car is in P gear, the pop-up window interface will disappear. When the alignment is successful and the user puts the car in P gear, the vehicle-side device will send a message "Ready, waiting for charging instructions"

[0052] When the VCU receives the "Ready, waiting for charging instructions" signal from the vehicle-side charging device and detects that all the following conditions are met, it sends a "wireless charging instruction" to the BMS and vehicle-side device to allow charging.

[0053] a) The gear position is P;

[0054] b) The vehicle has no faults that affect charging;

[0055] c) The vehicle speed is 0;

[0056] d) The wireless charging function is turned on;

[0057] Note: When the conditions are not met, such as a vehicle-side wireless device charging failure, or the vehicle shifts into another gear and leaves the charging area, or a vehicle fault that affects charging occurs, the VCU sends the "Allow Wireless Charging Command" to prohibit it.

[0058] After receiving the wireless charging permission instruction from the VCU, the BMS performs the following output: based on the capacity of the battery pack and the power of the wireless charging device, it sends a request for charging voltage and current to the vehicle-side device. The vehicle-side wireless charging device responds to the BMS's request for charging voltage and current.

[0059] During the wireless charging process in this application, when the temperature is higher than a certain value and the vehicle-side device requests cooling, the TMM drives the water pump and cooling fan to turn on.

[0060] When the set charging completion conditions are met, the following outputs are executed: BMS requests that the charging voltage and charging current be set to 0, feedbacks wireless charging completion to the VCU, and the VCU sends a wireless charging permission signal to prohibit; the wireless charger responds to the voltage and current request of the BMS, and the charging voltage and charging current are set to 0; if the current power gear is OFF, the high-voltage power-off process is executed, and the entire vehicle enters sleep within a certain period of time. If the current power gear is ON, the high-voltage connection is maintained.

[0061] Stop wireless charging: When the VCU detects that the prerequisites are not met, the VCU sends the "allow wireless charging command" to prohibit; or when it detects that wireless charging is completed, charging stops.

[0062] This solution can quickly respond to wireless charging and realize the normal operation of wireless charging through the joint work of multiple controllers in the vehicle; it realizes reminders, control and interaction of the wireless charging process through interactive control, effectively improving the accuracy of wireless charging startup control and the user experience when performing wireless charging; it achieves the purpose of guiding users to perform wireless charging through interactive control, and the interactive guidance is more reasonable, which improves the user experience; further, after the wireless charging is started, the control strategy is used to improve the charging efficiency and reduce the charging time.

[0063] 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 scope of protection of the present invention.

Claims

1. A control method for wireless charging of an electric vehicle, characterized in that: include: The on-board wireless charging module detects in real time whether the current vehicle is in the wireless charging area. When it is detected that the vehicle has entered the wireless charging area, a reminder signal is sent through the on-board large screen to indicate the current area of ​​the vehicle.

2. The control method for wireless charging of an electric vehicle according to claim 1, wherein: When a vehicle is detected to have entered the wireless charging area and the on-board wireless charging module and the wireless charging module of the charging station are not aligned successfully, the on-board large screen will send a reminder signal that the vehicle has entered the wireless charging area through a pop-up window.

3. The control method for wireless charging of an electric vehicle according to claim 2, wherein: After detecting that the vehicle has entered the wireless charging area, it checks in real time whether the on-board wireless charging module and the wireless charging module of the charging station are successfully aligned; when the alignment is successful and there is no charging fault in the BMS, the vehicle and the charging station are in a state where charging is allowed, and the vehicle's wireless charging function is on, the on-board large screen is controlled to remind the driver to shift into P gear for wireless charging through a pop-up window.

4. The control method for wireless charging of an electric vehicle according to claim 4, wherein: When a pop-up window reminds the driver to shift into P gear for wireless charging, the vehicle's gear status is monitored in real time. When the vehicle gear is in P gear, the pop-up interface disappears and the wireless charging process begins.

5. The control method for wireless charging of an electric vehicle according to claim 4, characterized in that: After entering the wireless charging process, a waiting charging instruction is sent to the on-board wireless charging module, and then it is detected whether the charging permission conditions are met. When the charging permission conditions are met, a charging permission instruction is sent to the BMS and the on-board wireless charging module.

6. The control method for wireless charging of an electric vehicle according to claim 5, characterized in that: Conditions under which charging is permitted include: a) The gear position is P; b) Faults related to vehicle charging; c) The vehicle speed is 0; d) The wireless charging function is turned on; When all the conditions for allowing charging are met, a charging permission instruction is issued.

7. The control method for wireless charging of an electric vehicle according to claim 5, wherein: After receiving the wireless charging permission instruction from the VCU, the BMS sends a request for charging voltage and current to the on-board wireless charging module. The on-board wireless charging module responds to the BMS's request for charging voltage and current and starts wireless charging to charge the battery pack.

8. The control method for wireless charging of an electric vehicle according to claim 7, wherein: After starting wireless charging to charge the battery pack, the temperature data of the battery pack during the charging process is monitored in real time. When the temperature is higher than the set temperature threshold, the on-board wireless charging module sends a cooling request instruction to the thermal management controller TMM, and the TMM drives the water pump and cooling fan to turn on to achieve temperature reduction.

9. A control method for wireless charging of an electric vehicle according to any one of claims 1 to 8, characterized in that: When the set charging completion conditions are met, the BMS requests the charging voltage and charging current to be set to 0, and feedback to the VCU that wireless charging is complete, and the VCU sends a wireless charging permission signal to prohibit; The wireless charging module responds to the voltage and current request of the BMS, and the charging voltage and charging current are set to 0; if the current power gear is OFF, the high-voltage power-off process is executed, and the entire vehicle enters sleep within the set time; if the current power gear is ON, the high-voltage connection is maintained.

10. A control method for wireless charging of an electric vehicle according to any one of claims 1 to 8, characterized in that: During the charging process, the VCU monitors the vehicle's charging conditions in real time. When the charging conditions are not met or charging is completed, the VCU issues a command to prohibit wireless charging and ends wireless charging.

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