CN112677766A - BMS-based intelligent electric vehicle power supplementing method and system - Google Patents
BMS-based intelligent electric vehicle power supplementing method and system Download PDFInfo
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Abstract
The invention discloses an intelligent electric vehicle power supplementing method based on a BMS (battery management system): 1) when the automobile is in a dormant state or the whole automobile is in a standby state, the BMS calculates the time point or detects that the voltage of the storage battery is lower than a set value, and the whole automobile communication is awakened through the CAN; 2) detecting the voltage value of the storage battery again, and executing the next step if the voltage value is lower than a set value; 3) the user determines whether to execute power supplement, and if so, executes the next step; 4) the VCU judges whether the power supply condition is met, and if so, the next step is executed; 5) and entering a power supply mode, and supplying power to the storage battery by the power battery. The invention breaks the regular awakening, and calculates the time according to the last power-off storage battery voltage value and stores the time t. And awakening the CAN network when the preset time point t is reached. Whether the storage battery (small battery) is supplied with power is judged according to the condition of the whole vehicle, so that the voltage of the storage battery can be ensured, and the power shortage of the storage battery is prevented. The automatic start judges and mends the electricity step, satisfies several kinds of service conditions of whole car, matches and carries out intelligence benefit electricity, has increased the intelligent degree of being energy automobile, improves user experience.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to an intelligent power supplementing method for a storage battery of an electric automobile.
Background
With the urgent trend of global energy shortage and environmental pollution, the global application calls for the development of new energy; china is more powerful in supporting the development of the new energy automobile industry. The new energy electric automobile has great advantages in the aspects of environmental protection, energy conservation, drivability and the like as a green transportation tool. The new energy electric automobile mainly comprises a battery, a motor, an electric control system and other accessories. In order to meet the indexes of the whole vehicle such as dynamic property, safety, economy, comfort and the like, all parts are cooperated and interacted with each other through a control module (ECU) of the part.
The 12V small storage battery is used as a core accessory of the new energy electric automobile, and the static power consumption of the 12V storage battery is far higher than that of a traditional automobile in the long-time parking or non-use process of the new energy automobile. If the vehicle is not used frequently, or is in the key ON gear state for a long time, the storage battery is often caused to lack of electricity, the problem that the whole vehicle cannot be electrified at high voltage is caused, and meanwhile, the service life of the storage battery is shortened. In the prior art, an external charger is used for supplying power to a vehicle or an after-sale service shop, so that inconvenience is brought to a driver.
The charging and power-off mode determined by human factors is not only lack of real-time monitoring of the state of the small battery, but also can not adapt to the special requirements of a maintenance-free storage battery, so that the overshoot and the undershoot of the battery are easily caused, and the battery can hardly reach the specified cycle life; the electric quantity of the small battery is too low, so that the normal operation of an electric control system of the electric automobile is influenced, the starting of the electric automobile is influenced, and the stability of the automobile is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of realizing an intelligent power supplementing method for an electric automobile, intelligently awakening a CAN network through BMS self-calculation, detecting whether a power supplementing condition is met, and executing power supplementing operation after the condition is met.
In order to achieve the purpose, the invention adopts the technical scheme that: the BMS-based intelligent electric vehicle power supplementing method comprises the following steps:
1) when the automobile is in a dormant state or the whole automobile is in a standby state, the BMS calculates the time point or detects that the voltage of the storage battery is lower than a set value, and the whole automobile communication is awakened through the CAN;
2) detecting the voltage value of the storage battery again, and executing the next step if the voltage value is lower than a set value;
3) the user determines whether to execute power supplement, and if so, executes the next step;
4) the VCU judges whether the power supply condition is met, and if so, the next step is executed;
5) and entering a power supply mode, and supplying power to the storage battery by the power battery.
In the 1), the method for calculating the time point by the BMS: the BMS memorizes the voltage value of the storage battery at the last dormancy time, obtains a theoretical value, namely possible feed time t according to the static power consumption of the storage battery, and reaches the calculation time point when the countdown time reaches t.
And in the step 3), the user selects whether to supplement power through the mobile phone and the TBOX or through large-screen operation.
In 4), satisfying the power supply condition includes that:
a. the ignition switch is in an OFF state;
b. all doors and covers are in a closed state;
c. the whole vehicle has no fault;
d、SOC＞10％。
in the step 5), when the charging enabling DCDC is used for charging the storage battery, if the charging enabling DCDC is unsuccessful, the BMS is powered down at high voltage, and an intelligent power supply failure signal is sent to a large screen and/or a user mobile phone to enter an intelligent power supply failure mode; if the DCDC is enabled successfully, the VCU sends an intelligent power supplementing success signal, and the BMS keeps the relay to be attracted until the voltage of the storage battery reaches a set value.
And 5) in the power supply mode, detecting the voltage value of the storage battery in real time, finishing the power supply mode after the preset voltage is reached, turning off a relay by the BMS, and enabling the vehicle to enter a dormant state or a whole vehicle standby state.
In the power supply mode of 5), if any one of the following signals is received, the power supply mode is adopted, the vehicle enters a dormant state or a whole vehicle standby state, and the signals include:
a. a key arming signal;
b. any vehicle door and vehicle cover opening signal;
c. a power-on signal;
d. and (5) failure of the whole vehicle.
In the standby state of the whole automobile, after the VCU receives the intelligent power supplement request, a power-on control instruction signal is sent out, and after each system module of the automobile receives a power-on control source signal from the CAN network, the following operations are executed: when the client executes the power-on instruction, defaulting to power-on action; when a customer has a power-off demand, controlling the whole vehicle to keep a 'false power-off' mode; and when the power supply is completed, entering a normal sleep mode.
The system for supplementing the intelligent electric vehicle based on the BMS is implemented, the BMS is connected with a storage battery to obtain a voltage signal of the storage battery, the output end of a power battery is connected with the storage battery through a relay and a DCDC, and the BMS controls the on-off of the relay.
The BMS is connected with the large screen, the T-BOX and the VCU through CAN lines, and the T-BOX is communicated with a user mobile phone through a wireless network.
The invention breaks the regular awakening, and calculates the time according to the last power-off storage battery voltage value and stores the time t. And awakening the CAN network when the preset time point t is reached. Whether the storage battery (small battery) is supplied with power is judged according to the condition of the whole vehicle, so that the voltage of the storage battery can be ensured, and the power shortage of the storage battery is prevented. The automatic start judges and mends the electricity step, satisfies several kinds of service conditions of whole car, matches and carries out intelligence benefit electricity, has increased the intelligent degree of being energy automobile, improves user experience.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
fig. 1 is a schematic diagram of an intelligent power supply system of an electric vehicle.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
As shown in fig. 1, the intelligent power supply system for the electric vehicle includes: BMS, VCU, relay, power battery group, the DCDC that charges realize mending the electricity through the CAN interaction of each system, and BMS connects the battery and acquires the battery voltage signal, and the battery is connected through relay, DCDC to the output of power battery, and BMS control the relay break-make. The BMS is connected with the large screen, the T-BOX and the VCU through CAN lines, and the T-BOX is communicated with a user mobile phone through a wireless network.
The power supply system of the intelligent power supply method of the electric automobile comprises the following two embodiments;
embodiment 1, remember the little battery voltage value of last dormancy time through the BMS, according to the static consumption of battery, use inside single chip microcomputer operation, obtain theoretical value-probably feed time t, rethread internal clock storage time t, after arrival time t, the BMS awakens up whole car CAN network, detects and compares the voltage value, judges whether need carry out intelligent power supply.
When intelligent power supplement is needed, the BMS sends an intelligent power supplement request signal, the VCU sends a power-on command signal to the BMS after judging that the current finished automobile condition allows power supplement, and sends a charging DCDC enabling signal, and the BMS simultaneously actuates the relay; and (4) synchronously detecting the voltage value of the storage battery, and when the voltage value reaches a set value, the intelligent power supplement of the power-off process is finished without other instructions.
When the above condition is not satisfied, a sleep mode is entered. The invention can intelligently detect the voltage of the small battery when the vehicle is not used, and can supplement power for the small battery under the conditions that the under-voltage state meets the power-on condition and the like.
Embodiment 2, under the condition that the whole vehicle standby-charging DCDC does not work (key ACC/ON gear), the intelligent power supplementing method based ON the BMS realizes the whole system by using the CAN interaction of the whole vehicle systems and the 4G signal interaction of the TBOX and the intelligent APP.
When the whole vehicle is in an ON gear, the charger DCDC does not work, and the 12V small storage battery is in a power consumption state and has no charging connection. The small storage battery supplies power to the instrument large screen and other low-voltage controllers, and the low-voltage storage battery feed risk is easily caused. At the moment, BMS real-time detection little battery voltage, when the magnitude of voltage reaches the critical point, send battery feed risk suggestion through the CAN bus, TBOX receives this signal after, utilize 4G signal transmission SMS to intelligent APP (customer end), remind the customer whether to carry out the benefit work, instruction has not been received in the 3S, BMS acquiescence execution benefit power request promptly, VCU receives the back, judge that whole car satisfies the benefit power condition, send the DCDC enable signal that charges promptly, BMS carries out relay closed action, it charges for the battery to reach power battery group. And (4) synchronizing, after the large screen receives a storage battery feed risk prompt sent by the BMS, immediately popping a frame to prompt a client whether to execute the electricity supplementing operation, and not receiving an instruction in 3S, namely executing the electricity supplementing operation by default.
In order to avoid other operations of the client at the same time, the VCU defaults to a power-on action when the client executes a power-on instruction according to the intelligent power-on state bit sent by the BMS; when a customer has a power-off demand, controlling the whole vehicle to keep a 'false power-off' mode; and when the power supply is completed, entering a normal sleep mode.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (10)
1. BMS-based intelligent electric vehicle power supplementing method is characterized in that:
1) when the automobile is in a dormant state or the whole automobile is in a standby state, the BMS calculates the time point or detects that the voltage of the storage battery is lower than a set value, and the whole automobile communication is awakened through the CAN;
2) detecting the voltage value of the storage battery again, and executing the next step if the voltage value is lower than a set value;
3) the user determines whether to execute power supplement, and if so, executes the next step;
4) the VCU judges whether the power supply condition is met, and if so, the next step is executed;
5) and entering a power supply mode, and supplying power to the storage battery by the power battery.
2. The BMS-based intelligent electric vehicle power supplementing method according to claim 1, wherein: in the 1), the method for calculating the time point by the BMS: the BMS memorizes the voltage value of the storage battery at the last dormancy time, obtains a theoretical value, namely possible feed time t according to the static power consumption of the storage battery, and reaches the calculation time point when the countdown time reaches t.
3. The BMS-based intelligent electric vehicle power supplementing method according to claim 1, wherein: and in the step 3), the user selects whether to supplement power through the mobile phone and the TBOX or through large-screen operation.
4. The BMS-based intelligent electric vehicle power supplementing method according to claim 1, wherein: in 4), satisfying the power supply condition includes that:
a. the ignition switch is in an OFF state;
b. all doors and covers are in a closed state;
c. the whole vehicle has no fault;
d、SOC＞10％。
5. the BMS-based intelligent electric vehicle power supplementing method according to claim 1, wherein: in the step 5), when the charging enabling DCDC is used for charging the storage battery, if the charging enabling DCDC is unsuccessful, the BMS is powered down at high voltage, and an intelligent power supply failure signal is sent to a large screen and/or a user mobile phone to enter an intelligent power supply failure mode; if the DCDC is enabled successfully, the VCU sends an intelligent power supplementing success signal, and the BMS keeps the relay to be attracted until the voltage of the storage battery reaches a set value.
6. The BMS-based intelligent power supplementing method for the electric automobile according to claim 1 or 5, wherein: and 5) in the power supply mode, detecting the voltage value of the storage battery in real time, finishing the power supply mode after the preset voltage is reached, turning off a relay by the BMS, and enabling the vehicle to enter a dormant state or a whole vehicle standby state.
7. The BMS-based intelligent electric vehicle power supplementing method according to claim 6, wherein: in the power supply mode of 5), if any one of the following signals is received, the power supply mode is adopted, the vehicle enters a dormant state or a whole vehicle standby state, and the signals include:
a. a key arming signal;
b. any vehicle door and vehicle cover opening signal;
c. a power-on signal;
d. and (5) failure of the whole vehicle.
8. The intelligent electricity supplementing method for BMS-based electric vehicles according to claim 1, 2, 3, 4, 5 or 7, wherein: in the standby state of the whole automobile, after the VCU receives the intelligent power supplement request, a power-on control instruction signal is sent out, and after each system module of the automobile receives a power-on control source signal from the CAN network, the following operations are executed: when the client executes the power-on instruction, defaulting to power-on action; when a customer has a power-off demand, controlling the whole vehicle to keep a 'false power-off' mode; and when the power supply is completed, entering a normal sleep mode.
9. The electricity supplementing system for performing the BMS-based intelligent electricity supplementing method of claims 1 to 8, wherein: BMS connects the battery and acquires the battery voltage signal, and power battery's output is through relay, DCDC connection battery, BMS control the relay break-make.
10. The electrical recharging system of claim 9, wherein: the BMS is connected with the large screen, the T-BOX and the VCU through CAN lines, and the T-BOX is communicated with a user mobile phone through a wireless network.
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| CN113071321A (en) * | 2021-05-14 | 2021-07-06 | 奇瑞商用车（安徽）有限公司 | New energy automobile 12V storage battery low-voltage protection control system and method |
| CN113085654A (en) * | 2021-05-07 | 2021-07-09 | 地上铁租车（深圳）有限公司 | Automatic power shortage prevention control method and system for low-voltage battery of electric vehicle |
| CN113320436A (en) * | 2021-07-19 | 2021-08-31 | 江苏吉麦新能源车业有限公司 | Novel intelligent power supplementing method for electric passenger car |
| CN113619395A (en) * | 2021-09-24 | 2021-11-09 | 小氢汽车(上海)有限公司 | Intelligent power supplementing method and system for storage battery and hydrogen fuel cell automobile |
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| CN113619448A (en) * | 2021-09-10 | 2021-11-09 | 奇瑞商用车（安徽）有限公司 | Intelligent monitoring method for new energy automobile storage battery |
| CN113619395A (en) * | 2021-09-24 | 2021-11-09 | 小氢汽车(上海)有限公司 | Intelligent power supplementing method and system for storage battery and hydrogen fuel cell automobile |
| CN113752837A (en) * | 2021-09-29 | 2021-12-07 | 中国第一汽车股份有限公司 | Low-voltage power supply control system and method for vehicle |
| CN113997788A (en) * | 2021-11-01 | 2022-02-01 | 一汽奔腾轿车有限公司 | Automatic power supply control method for low-voltage storage battery of electric vehicle |
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| CN114400746A (en) * | 2022-01-22 | 2022-04-26 | 安徽统凌科技新能源有限公司 | Charging wake-up control method of electric bicycle BMS |
| CN114400746B (en) * | 2022-01-22 | 2023-01-17 | 安徽统凌科技新能源有限公司 | Charging wake-up control method of electric bicycle BMS |
| CN114905971A (en) * | 2022-05-20 | 2022-08-16 | 合众新能源汽车有限公司 | Power supplementing method and device for storage battery of electric automobile and vehicle |
| CN115173515A (en) * | 2022-07-21 | 2022-10-11 | 江苏开沃汽车有限公司 | Intelligent power supplementing system and method for new energy electric vehicle storage battery |
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| CN116749766B (en) * | 2023-07-11 | 2023-12-12 | 苏州盱酋汽车科技有限公司 | Automobile energy control method and system |
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Application publication date: 20210420 |