Intelligent charging method for electric vehicle

Abstract

The invention belongs to the technical field of electric vehicles, and particularly relates to an intelligent charging method for an electric vehicle, which comprises the following steps that: a vehicle-mounted remote controller TBOX automatically wakes up a vehicle control unit VCU at set intervals, the vehicle control unit judges the voltage data of a storage battery after receiving a 12V battery charging instruction of the TBOX, and the TBOX and VCU modules monitor the current voltage of a low-voltage battery at the same time; the TBOX calculates the real residual SOC% according to the battery residual electric quantity characteristic table and looks up the table at the same time, when one condition reaches the lower limit of voltage, the TBOX starts a charging request and controls high-voltage power-on, the power battery charges the 12.1 V storage battery through the DCDC, and the TBOX quits after charging is conducted for a period of time. According to the technical scheme, an intelligent power supply strategy is provided, calculation is carried out through dual-module voltage collection and a low-voltage storage battery residual SOC table look-up method, intelligent power supply is started after it is judged that the voltage is too low, cost is saved, and accurate power supply is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric vehicles, and particularly relates to an intelligent power supplementing method for electric vehicles. BACKGROUND

[0002] With the continuous development of automobile electronic technology, there are more and more electronic devices on vehicles, and the power consumption of low-voltage electrical systems has also increased significantly. The capacity of traditional low-voltage batteries has been difficult to meet the power consumption demand of these devices, and the phenomenon of power shortage is prone to occur. Many users have experienced that the vehicle cannot be started due to power shortage of the low-voltage storage battery, which brings great inconvenience to their daily travel.

[0003] If the low-voltage battery is often in a deep power shortage state, it will cause irreversible damage to the chemical structure and performance of the battery, and shorten the service life of the battery. The intelligent power supplementing function can ensure that the low-voltage battery will not be over-discharged, and always maintain within a reasonable power range, which is beneficial to prolong the overall life of the low-voltage battery.

[0004] To solve this problem, the prior art proposes an intelligent power supplementing technical solution. When the low-voltage storage battery voltage is too low, the temperature is low, the time is not used, the vehicle cannot sleep, etc., the vehicle power supply cannot be started, the TBOX monitors the vehicle storage battery voltage, and calculates the remaining SOC% of the low-voltage 12V battery by table lookup method. When the voltage is lower than the set threshold, the power supplementing is requested to start, which saves the cost of an electric quantity sensor and realizes accurate intelligent power supplementing. The intelligent power supplementing function can alleviate this problem to a certain extent, and provide more stable power supply for the electronic devices of the vehicle. The intelligent power supplementing function can automatically supplement power for the low-voltage battery when the vehicle is parked, effectively avoid the situation that the vehicle cannot be started due to power shortage, and enable users to use the vehicle more confidently.

[0005] By monitoring the state of the low-voltage battery and the use of the vehicle in real time, the intelligent power supplementing system can develop individualized charging strategies according to different working conditions, avoid damage to the battery caused by unreasonable charging methods, and further protect the health status of the battery.

[0006] The intelligent power supplementing function is one of the important manifestations of the intelligence of the vehicle, which can cooperate with other intelligent systems of the vehicle to jointly improve the overall performance of the vehicle and the user experience. The intelligent power supplementing system can automatically adjust the power supplementing strategy according to the driving state of the vehicle, the battery state and other information, and realize more intelligent energy management.

[0007] While existing intelligent charging technologies can monitor battery voltage and provide charging via TBOX, their charging strategies are relatively simple and cannot be dynamically adjusted based on the vehicle's actual usage and battery health. Furthermore, existing technologies typically rely on voltage detection in a single module, which can easily lead to inaccurate or ineffective charging due to sensor errors or module failures. Summary of the Invention

[0008] The purpose of the present invention is to provide an intelligent charging method for electric vehicles. The low-voltage battery intelligent charging function is to prevent the 12V low-voltage battery from being overly consumed due to long-term static state, resulting in low voltage affecting vehicle starting.

[0009] To achieve the above objectives, this application is implemented through the following technical solutions:

[0010] An intelligent charging method for an electric vehicle comprises the following steps:

[0011] S1: When the vehicle stops for more than the first set time, the onboard remote controller TBOX automatically wakes up the vehicle controller VCU every second set time and collects low-voltage battery voltage data;

[0012] S2: When the collected low-voltage battery voltage is lower than the set value, the onboard remote controller TBOX sends a charging command to the vehicle controller VCU;

[0013] S3. The vehicle controller VCU compares the low-voltage battery voltage data collected and sent to the CAN with the low-voltage battery voltage data collected by the onboard remote control TBOX;

[0014] S4. The onboard remote controller TBOX calculates the remaining SOC of the low-voltage battery according to the battery remaining capacity characteristic table. If one of the conditions reaches the lower voltage limit of the low-voltage battery first, the onboard remote controller TBOX sends a charging request, the vehicle controller VCU controls the high voltage to power on, and the power battery charges the low-voltage battery through DCDC. After the charging time is set, the charging stops and the system exits.

[0015] Furthermore, in step S1, when the key is in the OFF state, the vehicle remote controller TBOX wakes up automatically every night to detect the voltage of the vehicle's B+ power supply;

[0016] In the ignition state ACC condition, the vehicle remote controller TBOX detects the voltage of the B+ power supply in real time.

[0017] Furthermore, the on-board remote controller TBOX monitors the health status of the low-voltage battery and uses a machine learning algorithm to determine the health status of the low-voltage battery.

[0018] Further, the vehicle-mounted remote controller TBOX sends the charging request in step S4, and any one of the following conditions is triggered: the low-voltage battery voltage collected by the TBOX is lower than a set voltage value, the low-voltage battery voltage collected by the vehicle controller VCU is lower than the set voltage value, or the real residual SOC is calculated by the battery residual capacity characteristic table and is lower than the set voltage value.

[0019] Further, in the intelligent power compensation process, the local power-on or remote power-on of the vehicle causes the intelligent power compensation to exit.

[0020] Further, in the intelligent power compensation process, any one of the following conditions is met: the power state is in the ON mode, the 2AB key power-on state is detected, the high-voltage battery starts direct current or alternating current charging, the vehicle starts remote air conditioning or remote charging, and the intelligent low-voltage battery power compensation is exited, and the vehicle-mounted remote controller TBOX timing is cleared.

[0021] The beneficial effects of the present application are:

[0022] The technical solution provides an intelligent power compensation strategy, which calculates the voltage by double-module voltage collection and low-voltage battery residual SOC lookup table method, judges the voltage to be too low, and starts intelligent power compensation, saves cost, and realizes accurate power compensation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The intelligent power compensation flowchart of the present application. DETAILED DESCRIPTION

[0024] The technical solution of the present application will be described in detail below in combination with the drawings. The following examples are only exemplary and can only be used to explain and illustrate the technical solution of the present application, but cannot be interpreted as a limitation of the technical solution of the present application.

[0025] The intelligent power compensation method of the electric vehicle of the present application is to prevent the power of the 12V low-voltage battery from being excessively consumed due to long-term static placement, resulting in low voltage affecting vehicle starting. The vehicle-mounted remote controller TBOX automatically wakes up the vehicle controller VCU every certain period of time, and after receiving the 12V battery charging instruction of the TBOX, the vehicle controller judges the battery voltage data. Here, the TBOX and the VCU module will monitor the current voltage of the low-voltage battery at the same time, and the TBOX will calculate the real residual SOC% lookup table according to the battery residual capacity characteristic table. If one condition reaches the lower limit of the voltage, the TBOX starts the charging request, controls the high-voltage power-on, and the power battery charges the 12.1V storage battery through the DCDC. After a certain period of time (20 minutes, the compensation time is adjusted according to the vehicle model), the charging is exited.

[0026] As Figure 1As shown, the application provides an intelligent power supplement method for an electric vehicle, comprising the following steps:

[0027] S1, when the vehicle is parked for more than a first set time, the vehicle-mounted remote controller TBOX automatically wakes up the vehicle controller VCU every second set time and collects low-voltage battery voltage data. The technical solution dynamically adjusts the power supplement strategy according to the actual use of the vehicle and the health status of the battery, avoids unnecessary power supplement operation, and prolongs the service life of the battery.

[0028] The prerequisite for starting the technical solution is:

[0029] 1. In the OFF state, the vehicle-mounted remote controller TBOX wakes up every day at 2 a.m. Beijing time and detects the voltage of the vehicle small battery system (B+ power supply). In other embodiments of the application, the specific time can be set to other times as needed.

[0030] Key OFF, TBOX wakes up every day at 2 a.m. Beijing time, voltage is lower than 12.1V (T_BOX collects battery voltage 12.1V), T_BOX, 4F0 (HCAN) wakes up, sends 10 frames every time there is a wake-up requirement according to the period 100ms --- wakes up HVCU, HVCU controls the main relay to work, T_BOX detects power supply (box-ON electric connection main relay) to start working.

[0031] 2. In the ACC state, the vehicle-mounted remote controller TBOX detects the voltage of the vehicle small battery system (B+ power supply) in real time; if one of the two conditions is met, the TBOX detects that the voltage is lower than 12.1V (configurable, T_BOX collects battery voltage 12.1V, VCU internal 12.1V, battery remaining capacity characteristic table, calculates the real remaining SOC% lookup table lower than 12.1V, with one of the module voltages lower than 12.1V), trigger the intelligent power supplement function.

[0032] S2, when the collected low-voltage battery voltage is lower than the set value, the vehicle-mounted remote controller TBOX sends a charging instruction to the vehicle controller VCU.

[0033] S3, the vehicle controller VCU compares the low-voltage battery voltage data collected and sent to the CAN with the low-voltage battery voltage data collected by the vehicle-mounted remote controller TBOX. The vehicle-mounted remote controller TBOX monitors the health status of the low-voltage battery and uses a machine learning algorithm to judge the health status of the low-voltage battery.

[0034] S4, the vehicle-mounted remote controller TBOX calculates the remaining SOC of the low-voltage storage battery according to the battery remaining capacity characteristic table, and if one condition reaches the lower limit of the voltage of the low-voltage storage battery, the vehicle-mounted remote controller TBOX sends a charging request, the vehicle control unit VCU controls the high-voltage power-on, the power battery charges the low-voltage storage battery through the DCDC, and the charging is stopped after the set time, and then the process is exited.

[0035] Specifically, the T_BOX sends 0x3C0---TBOX_LvChargeReq on the BCAN, and when the start bit 2=0x2:RequestCharged On, the gateway is transferred to CCAN_0x3A0.

[0036] When the HVCU receives the gateway 0x3A0 TBOX_LvChargeReq=0x2:RequestCharged On, the intelligent power compensation request is started, and the HVCU controls the high voltage.

[0037] After the high voltage is powered on, the HVCU sends the DCDC working enable, 0x17B VCUDCCOperModeReqSts=0x1:working, and 0x17B HCU_DCDCvoltageSet target voltage---DCDC works.

[0038] The TBOX detects 0x221_RomoteLvChargeFb=0x3:RmtLVcharge working on the HCAN, and the power compensation starts timing for 20 minutes.

[0039] When the power compensation is over, the T_BOX sends 0x3C0---TBOX_LvChargeReq on the BCAN, and when the start bit 2=0x1:RequestCharged Off, the power compensation is stopped.

[0040] The HVCU controls the low voltage, the main relay is powered off, the network is hibernated, and the power compensation is completed.

[0041] The related input and output signals are shown in Table 1:

[0042] Table 1

[0043]

[0044] Table 1 (continued)

[0045]

[0046] In this application, when the 12V low-voltage storage battery is automatically charged by using the technical scheme, the local power-on or remote power-on of the vehicle causes the intelligent power compensation to exit.

[0047] In the intelligent power compensation process in the present application, any one of the following conditions is met: the power state is in the ON mode, the 2AB key power-on state is detected, the high-voltage battery starts direct current or alternating current charging, the vehicle starts remote air conditioning or remote charging, all of which exit the low-voltage storage battery intelligent power compensation, and the vehicle-mounted remote controller TBOX timing is cleared. Or after 20 minutes of charging timing, the vehicle-mounted remote controller TBOX stops the power compensation request, the VCU controls the main relay to power off, and the vehicle-mounted remote controller TBOX timer restarts timing.

[0048] The above is the preferred embodiment of the present application, the basic principles of the present application and the advantages of the present application are shown and described above, those skilled in the art should understand that the present application is not limited by the above examples, the above examples and the description in the specification are only to illustrate the principles of the present application, without departing from the spirit and scope of the present application, the present application will have various changes and improvements, these changes and improvements all fall within the scope of the claimed present application, the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An intelligent charging method for electric vehicles, characterized in that: The following steps are involved: S1: When the vehicle stops for more than the first set time, the onboard remote controller TBOX automatically wakes up the vehicle controller VCU every second set time and collects low-voltage battery voltage data; S2: When the collected low-voltage battery voltage is lower than the set value, the onboard remote controller TBOX sends a charging command to the vehicle controller VCU; S3. The vehicle controller VCU compares the low-voltage battery voltage data collected and sent to the CAN with the low-voltage battery voltage data collected by the onboard remote control TBOX; S4. The onboard remote controller TBOX calculates the remaining SOC of the low-voltage battery according to the battery remaining capacity characteristic table. If one of the conditions reaches the lower voltage limit of the low-voltage battery first, the onboard remote controller TBOX sends a charging request, the vehicle controller VCU controls the high voltage to power on, and the power battery charges the low-voltage battery through DCDC. After the charging time is set, the charging stops and the system exits.

2. The electric vehicle intelligent power replenishment method according to claim 1, characterized in that: In step S1, when the key is OFF, the vehicle remote controller TBOX wakes up every night to detect the voltage of the vehicle's B+ power supply; In the ignition state ACC condition, the vehicle remote controller TBOX detects the voltage of the B+ power supply in real time.

3. The intelligent power replenishment method for electric vehicles according to claim 1, characterized in that: The on-board remote controller TBOX monitors the health status of the low-voltage battery and uses machine learning algorithms to determine the health status of the low-voltage battery.

4. The intelligent power replenishment method for electric vehicles according to claim 1, characterized in that: When the on-board remote controller TBOX sends a charging request in step S4, the on-board remote controller TBOX is triggered to send a charging request when the voltage of any of the modules, including the low-voltage battery voltage collected by TBOX and lower than the set voltage value, the low-voltage battery voltage collected by the vehicle controller VCU and lower than the set voltage value, or the actual remaining SOC calculated by looking up the battery remaining power characteristic table and lower than the set voltage value, is lower than the set voltage value.

5. The intelligent power replenishment method for electric vehicles according to claim 1, characterized in that: During the intelligent charging process, local or remote power-on of the vehicle will cause the intelligent charging to exit.

6. The intelligent power replenishment method for electric vehicles according to claim 1, characterized in that: During the intelligent charging process, if any of the following conditions is met: the power state is detected to be in the ON position, the 2AB key is detected to be powered on, the high-voltage battery starts DC or AC charging, or the vehicle starts remote air conditioning or remote charging, the low-voltage battery intelligent charging will be exited and the TBOX timer of the vehicle remote controller will be reset.

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