Charging system and control method thereof

Abstract

The invention discloses a charging system and a control method thereof. The charging system comprises a processing unit, a charging vehicle, a power pool and a sampling unit, the charging vehicle is electrically connected with the processing unit, the processing unit is electrically connected with the power pool and the sampling unit, the power pool is electrically connected with the charging vehicle, and the output end of the power pool is electrically connected with the sampling unit; the processing unit is used for acquiring a charging vehicle charging demand from a charging vehicle and sending a power supply demand to the power pool; and the power pool obtains a power supply demand to supply power to the charging vehicle. The main technical scheme has the effects that the output voltage and current of the charging module are monitored in real time, and the demand of the vehicle is compared with the actual output, so that accurate charging control is realized.

Description

Technical Field

[0001] The present invention relates to the field of electric power charging, and in particular to a charging system and a control method thereof. Background Art

[0002] With the widespread use of electric vehicles, the demand for efficient and safe charging systems is increasing. Existing electric vehicle charging systems usually use multiple charging modules to charge vehicle batteries, and meet the needs of the vehicle by combining the outputs of the charging modules. The design of this type of charging system can meet basic charging needs to a certain extent, but its charging accuracy is low and there are deficiencies in the stability of output voltage and current.

[0003] In existing charging systems, the output accuracy of the charging module is completely dependent on the module's own voltage and current stabilization capabilities. Due to the large performance differences between different modules, the overall output accuracy of the charging system is difficult to effectively guarantee, which can easily cause the output voltage or current to deviate from the actual needs of the vehicle. The charging system usually achieves charging output through a combination of multiple charging modules, but the current sharing control between these modules is often not precise enough. Module performance differences, communication delays or insufficient current sharing control will cause some modules to be overloaded or underloaded, which in turn causes overvoltage or overcurrent in the system, increasing the risk of system failure. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to solve the defect in the prior art that the overall output accuracy of the charging system is difficult to be effectively guaranteed due to the large performance differences between different modules, which easily leads to the output voltage or current deviating from the actual needs of the vehicle, and further provide a charging system and a control method thereof, in order to introduce an electric meter sampling feedback mechanism to monitor the output voltage and current of the charging module in real time, compare the vehicle's needs with the actual output, and thus achieve precise charging control. This high-precision following mechanism makes the charging output more in line with the actual needs of the vehicle, reducing the output error problem caused by module performance differences.

[0005] Technical solution:

[0006] In a first aspect, the present application proposes a charging system, comprising: a processing unit, a charging vehicle, a power pool, and a sampling unit;

[0007] The charging vehicle is electrically connected to the processing unit, the processing unit is electrically connected to the power pool and the sampling unit respectively, the power pool is electrically connected to the charging vehicle, wherein the output end of the power pool is electrically connected to the sampling unit;

[0008] The processing unit is used to obtain the charging demand of the charging vehicle from the charging vehicle, and send the power supply demand to the power pool;

[0009] The power pool obtains power supply demand to supply power to the charging vehicle;

[0010] The sampling unit obtains the actual power supply measurement value of the power pool and transmits it to the processing unit, so that the processing unit obtains the output error through the charging demand and the actual power supply measurement value, and determines whether the output error meets the preset requirements. If so, the charging demand of the charging vehicle remains unchanged; if not, the charging demand is updated through the output error.

[0011] Beneficial effects: By introducing the meter sampling feedback mechanism of the sampling unit, the output voltage and current of the charging module are monitored in real time, and the vehicle's demand is compared with the actual output, thereby achieving precise charging control. This high-precision following mechanism makes the charging output more in line with the actual needs of the vehicle and reduces the output error problem caused by module performance differences;

[0012] Through a closed-loop control feedback loop, the system can adjust the output of the charging module in real time according to the difference between actual output and demand in each charging cycle. Through this error compensation mechanism, the system can correct output deviations in a short time, avoid overvoltage or overcurrent, extend the battery life, and improve charging safety.

[0013] Preferably, the charging vehicle includes a first CAN communication unit, and the processing unit includes a second CAN communication unit. The charging vehicle is electrically connected to the processing unit via the first communication unit and the second CAN communication unit, so that the central processing unit is used to obtain the charging demand from the charging vehicle. Beneficial effect: the direct connection between the first and second CAN communication units ensures that the demand information of the charging vehicle can be quickly and accurately transmitted to the central processing unit. The central processing unit obtains the voltage and current requirements of the charging vehicle in real time, so that the charging system can respond to and meet the actual needs of the vehicle more accurately, thereby improving the charging accuracy.

[0014] Preferably, the processing unit also includes a power control unit, which is electrically connected to the power pool through the power control unit so that the processing unit sends the power supply demand to the power pool. Beneficial effect: through the power control unit, the central processing unit can accurately allocate the charging demand to each charging module in the power pool. This precise allocation ensures that the output of each charging module can closely match the needs of the vehicle, thereby improving the charging accuracy of the system and avoiding unnecessary waste of power.

[0015] Preferably, the power pool includes N charging modules, where N is a positive integer. The power pool is electrically connected to the charging vehicle and the electric meter sampling unit through the charging module to supply power to the power pool charging vehicle. Beneficial effects: through the combination of multiple charging modules, the power pool can distribute power more evenly, ensuring equal current output among modules, thereby improving the charging accuracy of the system. The implementation of equal current control reduces the risk of overloading or underloading a single module, helps to extend the life of the equipment and improve the stability of the system.

[0016] Preferably, the processing unit further comprises an electric meter processing unit, and the processing unit is electrically connected to the electric meter sampling unit via the electric meter processing unit, so that the electric meter sampling unit obtains the actual power supply measurement value of the power pool and transmits it to the processing unit.

[0017] Preferably, the processing unit obtains the output error formula through the charging demand and the actual power supply measurement value as follows:

[0018] P = AB;

[0019] Among them, A is the last set charging demand or the first charging demand, B is the actual power supply measurement value, and P is the output error. Beneficial effects: By calculating the output error in real time and adjusting it, overvoltage or overcurrent can be effectively avoided, reducing the risk of the system during the charging process. At the same time, by accurately adjusting the voltage and current, overcharging of the vehicle battery is avoided and the battery life is extended.

[0020] Preferably, the formula for updating the charging demand by outputting the error is:

[0021] T=Ak*P:

[0022] Among them, T is the charging demand set this time, A is the charging demand set last time or the first charging demand, k is the stability adjustment coefficient, and P is the output error. Beneficial effect: This formula calculates the output error in real time and adjusts the charging demand according to the error, so that the system can quickly respond to changes in the actual demand of the vehicle. This dynamic adjustment ensures that the demand value during the charging process is always consistent with the actual situation.

[0023] In a second aspect, in some embodiments, a control method of a charging system is also provided, comprising the following step 30:

[0024] Step 301, obtaining the charging demand of the charging vehicle, and sending the power supply demand to the power pool;

[0025] Step 302: The power pool obtains power supply demand and supplies power to the charging vehicle;

[0026] Step 303: The sampling unit obtains the actual power supply measurement value of the power pool and transmits it to the processing unit, so that the processing unit obtains the output error through the charging demand and the actual power supply measurement value;

[0027] Step 304, determining whether the output error meets the preset requirement, if so, the vehicle charging demand remains unchanged and the process returns to step 301;

[0028] Step 305 , if not, update the charging requirement by outputting the error and return to step 301 .

[0029] Preferably, the processing unit obtains the output error formula through the charging demand and the actual power supply measurement value as follows:

[0030] P = AB;

[0031] Among them, A is the last set charging requirement or the first charging requirement, B is the actual power supply measurement value, and P is the output error.

[0032] Preferably, the formula for updating the charging demand by outputting the error is:

[0033] T = Ak * P;

[0034] Among them, T is the charging demand set this time, A is the charging demand set last time or the first charging demand, B is the actual power supply measurement value, k is the stability adjustment coefficient, and P is the output error.

[0035] Preferably, it also includes a memory, which is electrically connected to the processing unit and is used to store charging demand information of the charging vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the charging system framework of the present invention;

[0037] Figure 2 This is a schematic diagram of the specific structural framework of the first CAN communication unit of the present invention;

[0038] Figure 3 It is a schematic diagram of the process of the present invention.

[0039] Figure numerals: 1. processing unit; 101. power control unit; 102. electric meter processing unit; 103. second CAN communication unit; 2. power pool; 201. charging module; 3. sampling unit; 4. charging vehicle; 401. first CAN communication unit; 5. memory. DETAILED DESCRIPTION

[0040] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0042] In view of the problems existing in the existing technology, such as Figure 1 As shown, an embodiment of the present invention provides a first aspect, and the present application proposes a charging system, including: a processing unit 1, a charging vehicle 4, a power pool 2 and a sampling unit 3;

[0043] The charging vehicle 4 is electrically connected to the processing unit 1, the processing unit 1 is electrically connected to the power pool 2 and the sampling unit 3 respectively, the power pool 2 is electrically connected to the charging vehicle 4, wherein the output end of the power pool 2 is electrically connected to the sampling unit 3;

[0044] The processing unit 1 is used to obtain the charging demand of the charging vehicle 4 from the charging vehicle 4, and send the power supply demand to the power pool 2;

[0045] The power pool 2 obtains power supply demand to supply power to the charging vehicle 4;

[0046] The sampling unit 3 obtains the actual power supply measurement value of the power pool 2 and transmits it to the processing unit 1, so that the processing unit 1 obtains the output error through the charging demand and the actual power supply measurement value, and determines whether the output error meets the preset requirements. If so, the charging demand of the charging vehicle 4 does not change. If not, the charging demand is updated through the output error.

[0047] Specifically, the charging vehicle 4 is electrically connected to the processing unit 1, and the processing unit 1 is used to obtain the charging demand of the charging vehicle 4. The processing unit 1 is electrically connected to the power pool 2 and the sampling unit 3 respectively, and is used to send the power supply demand to the power pool 2. The power pool 2 is electrically connected to the charging vehicle 4, and is responsible for providing the actual required power to the charging vehicle. The output end of the power pool 2 is electrically connected to the sampling unit 3, and the sampling unit 3 monitors the output voltage and current of the power pool in real time, and transmits the actual power supply measurement value to the processing unit 1. Through the feedback of the sampling unit 3, the system can monitor and adjust the output voltage and current in real time to accurately respond to vehicle needs. By adopting closed-loop control, the system can quickly adjust the output of the charging module 201 according to the difference between the demand and the actual power supply, thereby improving the charging accuracy and safety, avoiding overvoltage or overcurrent, extending the battery life, and improving the charging efficiency.

[0048] In some specific embodiments, Figure 2 The charging vehicle 4 includes a first CAN communication unit 401, and the processing unit 1 includes a second CAN communication unit 103. The charging vehicle 4 is electrically connected to the processing unit 1 through the first communication unit and the second CAN communication unit 103, so that the central processing unit 1 is used to obtain the charging demand from the charging vehicle 4.

[0049] Specifically, the first CAN communication unit 401 is installed on the charging vehicle 4, and is used to collect and send demand information (such as voltage, current, etc.) of the charging vehicle in real time. Through this unit, the charging vehicle can quickly transmit its own charging demand to the processing unit. The second CAN communication unit 103 is integrated in the central processing unit 1 and is connected to the first CAN communication unit 401 for communication. The main task of the second CAN communication unit 103 is to receive the charging demand signal from the first CAN communication unit 401 and transmit this information to the core control module of the processing unit 1;

[0050] Communication process: The charging vehicle 4 sends the charging demand to the second CAN communication unit 103 through the first CAN communication unit 401, and the latter feeds back the demand information to the central processing unit 1. In this way, the central processing unit can obtain the real-time demand data of the charging vehicle and use it as a basis for power distribution and charging control. Through the direct connection between the first and second CAN communication units, the processing unit 1 can receive the vehicle's demand information in real time and efficiently, reducing the delay in information transmission. The high anti-interference ability of the CAN bus ensures the reliability of data transmission, and can ensure the integrity and accuracy of the data even in a complex charging environment.

[0051] In some specific embodiments, Figure 2The processing unit 1 further includes a power control unit 101 , and the processing unit 1 is electrically connected to the power pool 2 through the power control unit 101 , so that the processing unit 1 sends the power supply demand to the power pool 2 .

[0052] Specifically, the power control unit 101 is responsible for converting the charging demand information into a control instruction and sending the instruction to each charging module in the power pool 2. Through the power control unit 101, the processing unit 1 can dynamically adjust the output of the power pool to ensure that the charging system provides appropriate voltage and current according to the needs of the vehicle. The power control unit 101 is directly electrically connected to the power pool 2. This connection enables the processing unit 1 to convey accurate power supply requirements to the power pool 2 through the power control unit 101 to guide the charging modules in the power pool to supply power on demand, thereby avoiding redundant power output and waste of resources. The power control unit 101 can adjust the output of the power pool 2 by analyzing the demand information of the charging vehicle in real time, so that the charging modules 201 in the power pool 2 can achieve current sharing control. Regardless of whether it is a high power demand or a low power demand, the system can adjust the output of the charging module 201 to accurately match the voltage and current currently required by the vehicle. Through the allocation and management of the power control unit 101, the system can effectively avoid overloading or underloading of a single module, thereby improving the overall safety and stability of the power pool 2. Especially in the case of high-load charging, the power control unit 101 can balance the loads of each module to prevent the system from failing due to local overload.

[0053] In some specific embodiments, Figure 2 The power pool 2 includes N charging modules 201, where N is a positive integer. The power pool 2 is electrically connected to the charging vehicle 4 and the meter sampling unit 3 through the charging module 201 to supply power to the charging vehicle 4 of the power pool 2.

[0054] Specifically, the power pool 2 is composed of N charging modules 201, each of which can work independently or collaboratively. The modular design enables the system to flexibly adjust the power output according to changes in charging demand to meet the charging needs of different types of vehicles, such as electric vehicles, electric trucks, electric buses, etc. Each charging module 201 is directly connected to the charging vehicle 4 through an electrical connection to ensure that the charging vehicle can obtain stable and accurate voltage and current. The collaborative work between modules can ensure uniform power distribution, so that the charging vehicle maintains a stable power input during the entire charging process. Each charging module 201 is also connected to the meter sampling unit 3, which can collect the actual supply voltage and current data of the power pool in real time. These data are transmitted to the processing unit 1 to help the system monitor and adjust the output power to ensure that the charging output meets the vehicle requirements.

[0055] In some specific embodiments, Figure 2The processing unit 1 further includes an electric meter processing unit 1021 . The processing unit 1 communicates with the electric meter sampling unit 3 through the electric meter processing unit 1021 , so that the electric meter sampling unit 3 obtains the actual power supply measurement value of the power pool 2 and transmits it to the processing unit 1 .

[0056] Specifically, the meter sampling unit 3 is connected to the output end of the power pool 2, and measures the power supply parameters such as the output voltage and current of the power pool 2 in real time. The measured value reflects the actual power supply status of the power pool 2, ensuring the accuracy and timeliness of the data during the charging process. The meter sampling unit 3 transmits the measured value to the meter processing unit 1021. The meter processing unit 1021 is responsible for receiving and processing these data and converting them into a format understandable to the processing unit 1 for further calculation and analysis.

[0057] In some specific embodiments, Figure 2 and Figure 3 , the processing unit 1 obtains the output error formula through the charging demand and the actual power supply measurement value:

[0058] P = AB;

[0059] Among them, A is the last set charging requirement or the first charging requirement, B is the actual power supply measurement value, and P is the output error.

[0060] Specifically, the processing unit 1 first sets the power supply parameters required by the charging system, including the target voltage and current, according to the real-time demand of the charging vehicle 4. These demand values ​​(denoted as A) are used as the expected output of the charging system. When the first charging cycle starts, the first charging demand, including the target voltage and current, is used, denoted as A. When the second cycle starts, the charging demand is corrected to the charging demand set last time, also denoted as A. The processing unit 1 receives the real-time power supply measurement value (denoted as B) from the meter sampling unit 3 through the meter processing unit 1021. These values ​​represent the current actual output state of the power pool 2. The processing unit 1 compares the charging demand value A with the actual power supply measurement value B to calculate the output error P.

[0061] In some specific embodiments, Figure 2 and Figure 3 , the formula for updating the charging demand through the output error is:

[0062] T = Ak * P;

[0063] Among them, T is the charging demand set this time, A is the charging demand set last time or the first charging demand, B is the actual power supply measurement value, k is the stability adjustment coefficient, and P is the output error.

[0064] Specifically, after calculating the output error, the processing unit 1 adjusts the charging demand according to the error value to ensure that the system can gradually approach the actual demand of the vehicle. k determines the proportion of the output error adjustment. By setting k, the step size of each adjustment can be controlled to make the system more accurately approach the target demand. A larger k value will make the system respond quickly to the output error, but it will also increase the risk of fluctuations during the adjustment process, and overshoot may occur. A smaller k value will make the system react more slowly. According to the setting of the adjustment coefficient k, the system can achieve a balance between response speed and stability to ensure the safety and efficiency of the charging process. Through feedback control of the output error, the system can accurately adjust the charging demand and gradually reduce the error.

[0065] In a second aspect, in some embodiments, a control method of a charging system is also proposed, combining Figure 3 , comprising the following steps 30:

[0066] Step 301, obtaining the charging demand of the charging vehicle 4, and sending the power supply demand to the power pool 2;

[0067] Step 302, the power pool 2 obtains power supply demand to supply power to the charging vehicle 4;

[0068] Step 303, the sampling unit 3 obtains the actual power supply measurement value of the power pool 2 and transmits it to the processing unit 1, so that the processing unit 1 obtains the output error through the charging demand and the actual power supply measurement value;

[0069] Step 304, determining whether the output error meets the preset requirement, if so, the vehicle charging demand remains unchanged and the process returns to step 301;

[0070] Step 305 , if not, update the charging requirement by outputting the error and return to step 301 .

[0071] Specifically, step 301: obtaining the charging demand of the charging vehicle 4, and sending the power supply demand to the power pool 2, the demand information includes the voltage and current parameters required by the vehicle to ensure that the power pool 2 can provide a charging output that meets the demand;

[0072] Step 302: The power pool 2 supplies power to the charging vehicle 4 according to the received power supply demand. Through the coordinated work of multiple charging modules 201, the power pool 2 can provide an appropriate amount of power output to meet the actual demand of the charging vehicle 4;

[0073] Step 303: the sampling unit 3 obtains the actual power supply measurement value of the power pool 2 in real time, and transmits the measurement value to the processing unit 1, and the processing unit 1 compares the measurement value with the original charging demand to calculate the output error;

[0074] Step 304: Processing unit 1 determines whether the calculated output error is within a preset allowable range;

[0075] If the requirements are met: the system considers that the current power supply demand is suitable, does not make any adjustments, and directly returns to step 301 to continue to meet the needs of the charging vehicle 4;

[0076] If it does not meet the requirements: the system recognizes that there is an error between the actual power supply and the demand, and adjustment is required;

[0077] Step 305: When the output error exceeds the allowable range, the processing unit 1 updates the charging demand through the output error formula and transmits the new demand to the power pool 2. After that, the system returns to step 301 and continues to perform error detection and adjustment until the error meets the preset standard.

[0078] Preferably, the processing unit obtains the output error formula through the charging demand and the actual power supply measurement value as follows:

[0079] P = AB;

[0080] Among them, A is the last set charging requirement or the first charging requirement, B is the actual power supply measurement value, and P is the output error.

[0081] Preferably, the formula for updating the charging demand by outputting the error is:

[0082] T = Ak * P;

[0083] Among them, T is the charging demand set this time, A is the charging demand set last time or the first charging demand, B is the actual power supply measurement value, k is the stability adjustment coefficient, and P is the output error.

[0084] Preferably, a memory 5 is further included, wherein the memory 5 is electrically connected to the processing unit 1 and is used to store charging demand information of the charging vehicle 4 .

[0085] The above is only a specific implementation of the embodiment of the present invention, but the protection scope of the embodiment of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiment of the present invention should be included in the protection scope of the embodiment of the present invention. Therefore, the protection scope of the embodiment of the present invention should be based on the protection scope of the claims.

Claims

1. A charging system, characterized in that: include: Processing unit, charging vehicle, power pool and sampling unit; The charging vehicle is electrically connected to the processing unit, the processing unit is electrically connected to the power pool and the sampling unit respectively, the power pool is electrically connected to the charging vehicle, wherein the output end of the power pool is electrically connected to the sampling unit; The processing unit is used to obtain the charging demand of the charging vehicle from the charging vehicle, and send the power supply demand to the power pool; The power pool is used to obtain power supply demand to supply power to the charging vehicle; The sampling unit is used to obtain the actual power supply measurement value of the power pool and transmit it to the processing unit, so that the processing unit can obtain the output error through the charging demand and the actual power supply measurement value, and judge whether the output error meets the preset requirements. If so, the charging demand of the charging vehicle does not change; if not, the charging demand is updated through the output error.

2. The system according to claim 1, characterized in that The charging vehicle includes a first CAN communication unit, the processing unit includes a second CAN communication unit, and the charging vehicle is electrically connected to the processing unit via the first communication unit and the second CAN communication unit, so that the central processing unit is used to obtain charging requirements from the charging vehicle.

3. The system according to claim 1, characterized in that The processing unit further includes a power control unit, and the processing unit is electrically connected to the power pool through the power control unit, so that the processing unit sends a power supply demand to the power pool.

4. The system according to claim 1, characterized in that The power pool includes N charging modules, where N is a positive integer. The power pool is electrically connected to the charging vehicle and the electric meter sampling unit through the charging modules to supply power to the power pool charging vehicle.

5. The system according to claim 1, characterized in that The processing unit further comprises an electric meter processing unit, and the processing unit is electrically connected to the electric meter sampling unit through the electric meter processing unit, so that the electric meter sampling unit obtains the actual power supply measurement value of the power pool and transmits it to the processing unit.

6. The system according to claim 1, characterized in that The processing unit uses the charging demand and actual power supply measurement values ​​to derive the output error formula as follows: P = AB; Among them, A is the last set charging requirement or the first charging requirement, B is the actual power supply measurement value, and P is the output error.

7. The system according to claim 6, characterized in that The formula for updating the charging demand through the output error is: T=Ak*P. Among them, T is the charging demand set this time, A is the charging demand set last time or the first charging demand, k is the stability adjustment coefficient, and P is the output error.

8. A control method for a charging system, characterized in that: The method comprises the following steps 30: Step 301, obtaining the charging demand of the charging vehicle, and sending the power supply demand to the power pool; Step 302: The power pool obtains power supply demand and supplies power to the charging vehicle; Step 303: The sampling unit obtains the actual power supply measurement value of the power pool and transmits it to the processing unit, so that the processing unit obtains the output error through the charging demand and the actual power supply measurement value; Step 304, determining whether the output error meets the preset requirement, if so, the vehicle charging demand remains unchanged and the process returns to step 301; Step 305 , if not, update the charging requirement by outputting the error and return to step 301 .

9. The system according to claim 8, characterized in that The processing unit uses the charging demand and actual power supply measurement values ​​to derive the output error formula as follows: P = AB; Among them, A is the last set charging requirement or the first charging requirement, B is the actual power supply measurement value, and P is the output error.

10. The system according to claim 9, characterized in that The formula for updating the charging demand through the output error is: T=Ak*P. Among them, T is the charging demand set this time, A is the charging demand set last time or the first charging demand, k is the stability adjustment coefficient, and P is the output error.

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