Charging efficiency optimization method and system based on charging pile system

Abstract

The invention provides a charging efficiency optimization method and system based on a charging pile system, and belongs to the technical field of charging piles, and the method comprises the steps: obtaining the power supply voltage, the charging pile output power, the charger output power, the battery temperature and the battery electric quantity variation, and carrying out the curved surface fitting, and obtaining a corresponding fitting curved surface and a fitting equation; taking the maximum change quantity of the electric quantity of the battery as a target; the corresponding first power supply voltage, the first charging pile output power, the second power supply voltage, the first charger output power, the third power supply voltage, the second charging pile output power, the second charger output power, the third charging pile output power and the third charger output power are obtained, and real-time parameters are adjusted based on the parameters. According to the method, the fitting curved surface is obtained by using the curved surface fitting method, and the real-time parameters are adjusted based on the real-time parameters and the fitting curved surface by taking the maximum change quantity of the electric quantity of the battery as a target, so that the purpose of optimizing the charging efficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a charging efficiency optimization method and system based on a charging pile system. Background Art

[0002] Optimizing the charging efficiency of a charging pile system is a complex and multi-dimensional task, involving hardware upgrades, software optimization, user behavior adjustments, and operational strategies. The following are traditional optimization methods: 1. Hardware upgrade and technological innovation Improving charging pile power: The power of DC fast charging piles can be increased to 60kW to 350kW or even higher to meet the needs of fast charging.

[0003] For home users, they can choose to install a higher-power AC fast charging pile, which usually ranges from 7 to 11 kW.

[0004] Adopting efficient hardware components: Upgrade the internal hardware design of the charging pile, including key components such as power supply, transformer, DC interface, etc., to improve transmission efficiency and stability.

[0005] Choose a charging cable with high conductivity and good quality to reduce energy loss during transmission.

[0006] Introducing advanced technology: The introduction of superconducting materials and liquid cooling technology can reduce the heat dissipation requirements of charging piles, thereby improving charging efficiency.

[0007] Research, develop and apply new charging equipment, such as wireless charging and dynamic charging, to improve the convenience and flexibility of charging.

[0008] 2. Software Optimization and Intelligent Management Smart charging strategy: The battery management system of electric vehicles should have intelligent charging functions and be able to adjust the charging strategy according to the real-time status of the battery (such as voltage, current, temperature, etc.).

[0009] By optimizing the battery charging strategy, charging temperature control, etc., the charging efficiency is improved and the battery life is protected.

[0010] Internet of Things and Big Data Analysis: Use the Internet of Things (IoT) and big data analysis technologies to monitor and manage charging piles in real time, predict user needs, and reasonably allocate resources.

[0011] Introduce AI algorithms to realize automatic scheduling and fault warning functions of charging piles and improve operation and maintenance efficiency.

[0012] Intelligent scheduling system: According to the charging needs of electric vehicles and the power supply capacity of the power grid, the charging time and sequence should be reasonably arranged to improve the overall charging efficiency.

[0013] 3. Improving the charging environment and user behavior Keep the charging environment clean: A clean and dry charging environment can reduce problems such as poor contact and improve charging efficiency.

[0014] Reasonable choice of charging location: Avoid direct sunlight and rain to reduce the impact of environmental factors on charging equipment.

[0015] Optimizing user behavior: Set the charging time in advance to avoid competing with other vehicles during peak power consumption, thereby increasing the charging speed.

[0016] Before charging, turn off power-consuming devices in the car, such as air conditioning, audio, etc., to reduce battery load and improve charging efficiency.

[0017] IV. Operational Strategy and Marketing Promotion Reasonable layout and site selection: By scientifically planning the locations of charging piles, we can meet users' charging needs and reduce the time and cost of users looking for charging piles.

[0018] Priority will be given to installing charging stations in vehicle-dense areas such as commercial centers, transportation hubs, residential areas, and scenic spots.

[0019] Provide diversified services: Supporting facilities such as lounges and supermarkets are added to charging stations, and services such as free parking and hot water are provided to improve users' charging experience.

[0020] Introduce preferential policies such as service fee discounts and charging points system to attract more users to use charging piles.

[0021] Strengthen publicity and promotion: Develop targeted publicity strategies and clearly define publicity objectives and target audiences.

[0022] Use multiple channels for promotion, such as social media, advertising, event sponsorship, etc. to increase the visibility and usage of charging stations.

[0023] Regular maintenance and inspection: Regularly inspect, repair and maintain the charging piles to promptly detect and eliminate potential faults, extend the service life of the charging piles and improve their operating efficiency.

[0024] Based on the above-mentioned traditional optimization methods, the optimization effect is limited and needs to be improved. Summary of the invention

[0025] The present invention provides a charging efficiency optimization method and system based on a charging pile system to improve the optimization effect.

[0026] This specification discloses a charging efficiency optimization method based on a charging pile system, including: Obtain the power supply voltage, charging pile output power, charger output power and battery temperature, as well as the change in battery power per unit time, which is recorded as the battery power change; The supply voltage is used as a row vector, and the output power of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a first fitting surface and a first fitting equation; The supply voltage is used as a row vector, and the charger output power is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a second fitting surface and a second fitting equation; The supply voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a third fitting surface and a third fitting equation; The output power of the charging pile is used as a row vector, and the output power of the charger is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fourth fitting surface and a fourth fitting equation; The output power of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fifth fitting surface and a fifth fitting equation; The charger output power is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a sixth fitting surface and a sixth fitting equation; Obtain the real-time power supply voltage, the real-time charging pile output power, the real-time charger output power and the real-time battery temperature, and substitute them into the corresponding first to sixth fitting equations to obtain the target values. If the target values ​​are all greater than 0, then take the maximum change in battery power as the goal, and based on the first fitting surface, obtain the corresponding first power supply voltage and the first charging pile output power; based on the second fitting surface, obtain the corresponding second power supply voltage and the first charger output power; based on the third fitting surface and the real-time battery temperature, obtain the corresponding third power supply voltage; based on the fourth fitting surface, obtain the corresponding second charging pile output power and the second charger output power; based on the fifth fitting surface and the real-time battery temperature, obtain the corresponding third charging pile output power; based on the sixth fitting surface and the real-time battery temperature, obtain the corresponding third charger output power; Based on the average of the first power supply voltage, the second power supply voltage and the third power supply voltage, the real-time power supply voltage is adjusted; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, the real-time charging pile output power is adjusted; based on the average of the first charger output power, the second charger output power and the third charger output power, the real-time charger output power is adjusted to maximize the change in battery power per unit time, thereby improving charging efficiency.

[0027] In this manual, the output voltage of the charging pile is obtained; The power supply voltage is used as a row vector, and the charging pile output voltage is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a seventh fitting surface and a seventh fitting equation; The charger output power is used as a row vector, and the charging pile output voltage is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain an eighth fitting surface and an eighth fitting equation; The charging pile output voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a ninth fitting surface and a ninth fitting equation; Obtain the real-time output voltage of the charging pile, substitute it into the seventh fitting equation to the ninth fitting equation, and obtain the target value. If the target values ​​are all greater than 0, take the maximum change in battery power as the target, and obtain the corresponding fourth power supply voltage and the first charging pile output voltage based on the seventh fitting surface; obtain the corresponding fourth charger output power and the second charging pile output voltage based on the eighth fitting surface; obtain the corresponding third charging pile output voltage based on the ninth fitting surface and the real-time battery temperature; Based on the average of the first power supply voltage, the second power supply voltage, the third power supply voltage and the fourth power supply voltage, adjust the real-time power supply voltage; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, adjust the real-time charging pile output power; based on the average of the first charger output power, the second charger output power, the third charger output power and the fourth charger output power, adjust the real-time charger output power; based on the average of the first charging pile output voltage, the second charging pile output voltage and the third charging pile output voltage, adjust the real-time charging pile output voltage to maximize the change in battery power per unit time, thereby improving charging efficiency.

[0028] In this manual, the output current of the charging pile is obtained; The supply voltage is used as a row vector, and the output current of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a tenth fitting surface and a tenth fitting equation; The charger output power is used as a row vector, and the charging pile output current is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain an eleventh fitting surface and an eleventh fitting equation; The output current of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a twelfth fitting surface and a twelfth fitting equation; Obtain the real-time output current of the charging pile, substitute it into the tenth fitting equation to the twelfth fitting equation, and obtain the target value. If the target values ​​are all greater than 0, take the maximum change in battery power as the target, and obtain the corresponding fifth power supply voltage and the output current of the first charging pile based on the tenth fitting surface; obtain the corresponding fifth charger output power and the output current of the second charging pile based on the eleventh fitting surface; obtain the corresponding third charging pile output current based on the twelfth fitting surface and the real-time battery temperature; Based on the average of the first power supply voltage, the second power supply voltage, the third power supply voltage, the fourth power supply voltage and the fifth power supply voltage, adjust the real-time power supply voltage; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, adjust the real-time charging pile output power; based on the average of the first charger output power, the second charger output power, the third charger output power, the fourth charger output power and the fifth charger output power, adjust the real-time charger output power; based on the average of the first charging pile output current, the second charging pile output current and the third charging pile output current, adjust the real-time charging pile output current to maximize the change in battery power per unit time, thereby improving charging efficiency.

[0029] In this manual, spline interpolation method, B-spline method, least squares method, polynomial fitting method, non-parametric fitting method, Kriging method, NURBS method, implicit function method, Ferguson bicubic surface method and Bezier method are used for surface fitting, and finally the real-time parameters are adjusted based on the mean of the corresponding parameters.

[0030] In this specification, the mains voltage and / or photovoltaic voltage and / or wind power voltage are used as the power supply voltage. When two or more voltages are used at the same time, the grid-connected voltage between them is used as the power supply voltage.

[0031] This specification also discloses a charging efficiency optimization system based on a charging pile system, which is used to implement any of the above-mentioned charging efficiency optimization methods based on a charging pile system, and the charging efficiency optimization system based on a charging pile system includes: The first data acquisition module is used to obtain the power supply voltage, the charging pile output power, the charger output power and the battery temperature, as well as the change in battery power per unit time, which is recorded as the battery power change; Fitting module for: The supply voltage is used as a row vector, and the output power of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a first fitting surface and a first fitting equation; The supply voltage is used as a row vector, and the charger output power is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a second fitting surface and a second fitting equation; The supply voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a third fitting surface and a third fitting equation; The output power of the charging pile is used as a row vector, and the output power of the charger is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fourth fitting surface and a fourth fitting equation; The output power of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fifth fitting surface and a fifth fitting equation; The charger output power is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a sixth fitting surface and a sixth fitting equation; The second data acquisition module is used to obtain the real-time power supply voltage, the real-time charging pile output power, the real-time charger output power and the real-time battery temperature, and substitute the corresponding first fitting equation to the sixth fitting equation to obtain the target value. If the target values ​​are all greater than 0, the maximum battery power change is taken as the target, and based on the first fitting surface, the corresponding first power supply voltage and the first charging pile output power are obtained; based on the second fitting surface, the corresponding second power supply voltage and the first charger output power are obtained; based on the third fitting surface and the real-time battery temperature, the corresponding third power supply voltage is obtained; based on the fourth fitting surface, the corresponding second charging pile output power and the second charger output power are obtained; based on the fifth fitting surface and the real-time battery temperature, the corresponding third charging pile output power is obtained; based on the sixth fitting surface and the real-time battery temperature, the corresponding third charger output power is obtained; The optimization module is used to adjust the real-time power supply voltage based on the average of the first power supply voltage, the second power supply voltage and the third power supply voltage, adjust the real-time charging pile output power based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, and adjust the real-time charger output power based on the average of the first charger output power, the second charger output power and the third charger output power, so as to maximize the battery charge change per unit time, thereby improving the charging efficiency.

[0032] In this specification, a charging circuit is used to adjust the output power of the charger, and the charging circuit includes an input interface CN1, an output interface CN2, a fuse F1, a thermistor RT1, a capacitor C1, a common-mode inductor LF1, a capacitor C2, a diode VD1, a diode VD2, a diode VD3, a diode VD4, a capacitor C3, a resistor R4, a resistor R1, a capacitor C4, a diode VD5, a transformer T1, a resistor R55, a capacitor C55, a diode VD60, a capacitor C18, a resistor R45, a diode VD70, a capacitor C11, a resistor R11, a capacitor C10, a resistor R12, a capacitor C6, a resistor R10, a resistor R13, an optocoupler IC4, a capacitor C7, an oscillation chip IC1, a resistor R6, a capacitor C8, and a resistor R8 , field effect transistor VT1, resistor R5, resistor R2, diode VD6, resistor R5, resistor R7, resistor R16, resistor R19, resistor R14, voltage regulator chip IC2, capacitor C12, resistor R17, variable resistor RP1, resistor RP2, capacitor C13, resistor R40, diode VD18, diode VZD2, resistor R52, resistor R35, dual-color light emitting diode LED2, resistor R34, transistor VT2, fan FAN, resistor R33, resistor R10, capacitor C21, operational amplifier IC3, resistor R26, resistor R27, resistor R25, resistor R31, light emitting diode LED1, capacitor C60, diode VZD1, resistor R38, diode VD10, capacitor C19 and resistor R60; Pin 2 of the input interface CN1 is connected to one end of the fuse F1, pin 1 of the input interface CN1 is connected to one end of the thermistor RT1, the other end of the fuse F1 is connected to one end of the capacitor C1 and one end of one side of the common-mode inductor LF1, the other end of the thermistor RT1 is connected to the other end of the capacitor C1 and one end of the other side of the common-mode inductor LF1, the other end of one side of the common-mode inductor LF1 is connected to one end of the capacitor C2, the cathode of the diode VD1 and the anode of the diode VD3, the other end of the other side of the common-mode inductor LF1 is connected to the other end of the capacitor C1, the cathode of the diode VD2 and the anode of the diode VD4, the cathode of the diode VD3 is connected to the cathode of the diode VD4. The positive electrode of the diode VD4 is connected to the positive electrode of the capacitor C3, one end of the resistor R4, one end of the resistor R1, one end of the capacitor C4, the pin 12 of the transformer T1 and the grounded capacitor C20. The positive electrode of the diode VD2 is connected to the positive electrode of the diode VD1 and the negative electrode of the capacitor C3 and then grounded. The other end of the resistor R4 is connected to one end of the resistor R2, the grounded capacitor C11, the collector pin of the optocoupler IC4 and the pin 7 of the oscillation chip IC1. The other end of the resistor R2 is connected to the negative electrode of the diode VD6, the positive electrode of the diode VD6 is connected to the pin 9 of the transformer T1, the pin 8 of the transformer T1 is grounded, and the other end of the resistor R1 is connected to the other end of the capacitor C4. The positive electrode of the diode VD5 is connected to the pin 10 of the transformer T1 and the D electrode of the field effect tube VT1, the S electrode of the field effect tube VT1 is connected to one end of the resistor R5, one end of the resistor R8 and the grounded resistor R7, the other end of the resistor R8 is connected to the pin 3 of the oscillation chip IC1 and the grounded capacitor C8, the G electrode of the field effect tube VT1 is connected to one end of the resistor R6 and the other end of the resistor R5, the other end of the resistor R6 is connected to the pin 6 of the oscillation chip IC1, the pin 1 of the oscillation chip IC1 is connected to one end of the capacitor C10 and one end of the resistor R11, and the other end of the capacitor C10 is connected to the pin 2 of the oscillation chip IC1. , the other end of the resistor R11 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to the emitter pin of the optocoupler IC4 and the grounded resistor R13, the pin 8 of the oscillation chip IC1 is connected to one end of the resistor R10 and the grounded capacitor C6, the other end of the resistor R10 is connected to the pin 4 of the oscillation chip IC1 and the grounded capacitor C7, the pin 5 of the oscillation chip IC1 is grounded, the anode pin of the optocoupler IC4 is connected to one end of the resistor R14, the cathode pin of the optocoupler IC4 is connected to one end of the capacitor C12 and the pin 3 of the voltage stabilizing chip IC2, the pin 2 of the voltage stabilizing chip IC2 is connected to the first fixed end and the sliding end of the variable resistor RP1 and then grounded,Pin 1 of the voltage stabilizing chip IC2 is connected to one end of the resistor R17, the other end of the capacitor C12, the first fixed end of the variable resistor RP2, one end of the capacitor C13 and one end of the resistor R19, the second fixed end of the variable resistor is connected to the other end of the resistor R17, the other end of the capacitor C13 is connected to one end of the resistor R40, the second fixed end and the sliding end of the variable resistor RP2, the other end of the resistor R40 is connected to the cathode of the diode VD18, the anode of the diode VD18 is connected to the cathode of the diode VZD2 and one end of the resistor R52, the anode of the diode VZD2 is grounded, and the other end of the resistor R52 is connected to the cathode of the diode VZD2. The first embodiment is connected to one end of the resistor R335 and pin 7 of the operational amplifier IC3, the other end of the resistor R35 is connected to one end of the two-color light emitting diode LED2, the other end of the two-color light emitting diode LED2 is connected to one end of the resistor R34, the other end of the resistor R19 is connected to one end of the resistor R16, the other end of the resistor R16 and the other end of the resistor R14 are connected to one end of the resistor R38, the positive electrode of the diode VD70, the negative electrode of the diode VD60, the grounding resistor R45 and the grounding capacitor C18, the positive electrode of the diode VD60 is connected to one end of the resistor R55 and pin 6 of the transformer T1, and the The other end of the resistor R55 is connected to the grounded capacitor C55, the pin 3 of the transformer T1 is connected to the positive electrode of the diode VD10, the cathode of the diode VD10 is connected to one end of the resistor R60 and the grounded capacitor C19, the cathode of the diode VD70 is connected to one end of the output interface CN2, the other end of the output interface CNN2 is connected to one end of the resistor R10 and the grounded resistor R33, the other end of the resistor R10 is connected to the pin 3 of the operational amplifier IC3 and the grounded capacitor C21, the other end of the resistor R60 is connected to the collector of the transistor VT2, and the emitter of the transistor VT2 is connected to the fan FAN The base of the transistor VT2 is connected to the other end of the resistor R34, the pin 1 and the pin 6 of the op amp IC3, the other end of the resistor R38 is connected to one end of the resistor R31, one end of the resistor R25, the pin 8 of the op amp IC3, the grounded diode VZD1 and the grounded capacitor C60, the other end of the resistor R31 is connected to the positive electrode of the light emitting diode LED1, the negative electrode of the light emitting diode LED1 is grounded, the other end of the resistor R25 is connected to one end of the resistor R27 and the grounded diode VD12, the other end of the resistor R27 is connected to the pin 5 and the pin 2 of the op amp IC3, and the grounded resistor R26.

[0033] In this specification, the model of the operational amplifier IC3 is LM358, and the model of the oscillator chip IC1 is KA3842.

[0034] The embodiments of this specification can at least achieve the following beneficial effects: By obtaining the power supply voltage, charging pile output power, charger output power and battery temperature, as well as the change in battery power per unit time, recorded as the battery power change, surface fitting is used to obtain fitting surfaces. These fitting surfaces reflect the degree of influence between these parameters. That is, based on the real-time parameters and these fitting surfaces, the real-time parameters can be adjusted with the goal of maximizing the battery power change to achieve the purpose of optimizing the charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the charging efficiency optimization method based on the charging pile system involved in the present invention.

[0037] Figure 2 is a schematic diagram of a charging circuit involved in the present invention. DETAILED DESCRIPTION

[0038] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0039] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] like Figure 1 As shown, this embodiment provides a charging efficiency optimization method based on a charging pile system, including: Obtain the power supply voltage, charging pile output power, charger output power and battery temperature, as well as the change in battery power per unit time, which is recorded as the battery power change; The supply voltage is used as a row vector, and the output power of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a first fitting surface and a first fitting equation; The supply voltage is used as a row vector, and the charger output power is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a second fitting surface and a second fitting equation; The supply voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a third fitting surface and a third fitting equation; The output power of the charging pile is used as a row vector, and the output power of the charger is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fourth fitting surface and a fourth fitting equation; The output power of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fifth fitting surface and a fifth fitting equation; The charger output power is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a sixth fitting surface and a sixth fitting equation; Obtain the real-time power supply voltage, the real-time charging pile output power, the real-time charger output power and the real-time battery temperature, and substitute them into the corresponding first to sixth fitting equations to obtain the target values. If the target values ​​are all greater than 0, then take the maximum change in battery power as the goal, and based on the first fitting surface, obtain the corresponding first power supply voltage and the first charging pile output power; based on the second fitting surface, obtain the corresponding second power supply voltage and the first charger output power; based on the third fitting surface and the real-time battery temperature, obtain the corresponding third power supply voltage; based on the fourth fitting surface, obtain the corresponding second charging pile output power and the second charger output power; based on the fifth fitting surface and the real-time battery temperature, obtain the corresponding third charging pile output power; based on the sixth fitting surface and the real-time battery temperature, obtain the corresponding third charger output power; Based on the average of the first power supply voltage, the second power supply voltage and the third power supply voltage, the real-time power supply voltage is adjusted; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, the real-time charging pile output power is adjusted; based on the average of the first charger output power, the second charger output power and the third charger output power, the real-time charger output power is adjusted to maximize the change in battery power per unit time, thereby improving charging efficiency.

[0042] In some embodiments, the unit time may be 1 second, 2 seconds, 3 seconds, 1 minute, 2 minutes, and so on.

[0043] It is clear that the relevant adjustments of current, voltage and power are existing technologies, and reference can be made to the existing technologies, such as making corresponding adjustments through methods or devices such as current limiting, voltage dividing, and transformers.

[0044] In some embodiments, with the maximum battery power change as the goal, based on the first fitting surface, the first supply voltage corresponding to the real-time charging pile output power is obtained, and the first charging pile output power corresponding to the real-time supply voltage is obtained. Based on other fitting surfaces, the process of obtaining other parameters can be deduced in the same way.

[0045] In some embodiments, obtaining the output voltage of the charging pile; The supply voltage is used as a row vector, and the charging pile output voltage is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a seventh fitting surface and a seventh fitting equation; The charger output power is used as a row vector, and the charging pile output voltage is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain an eighth fitting surface and an eighth fitting equation; The charging pile output voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a ninth fitting surface and a ninth fitting equation; Obtain the real-time output voltage of the charging pile, substitute it into the seventh fitting equation to the ninth fitting equation, and obtain the target value. If the target values ​​are all greater than 0, take the maximum change in battery power as the target, and obtain the corresponding fourth power supply voltage and the first charging pile output voltage based on the seventh fitting surface; obtain the corresponding fourth charger output power and the second charging pile output voltage based on the eighth fitting surface; obtain the corresponding third charging pile output voltage based on the ninth fitting surface and the real-time battery temperature; Based on the average of the first power supply voltage, the second power supply voltage, the third power supply voltage and the fourth power supply voltage, adjust the real-time power supply voltage; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, adjust the real-time charging pile output power; based on the average of the first charger output power, the second charger output power, the third charger output power and the fourth charger output power, adjust the real-time charger output power; based on the average of the first charging pile output voltage, the second charging pile output voltage and the third charging pile output voltage, adjust the real-time charging pile output voltage to maximize the change in battery power per unit time, thereby improving charging efficiency.

[0046] In some embodiments, obtaining the output current of the charging pile; The supply voltage is used as a row vector, and the output current of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a tenth fitting surface and a tenth fitting equation; The charger output power is used as a row vector, and the charging pile output current is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain an eleventh fitting surface and an eleventh fitting equation; The output current of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a twelfth fitting surface and a twelfth fitting equation; Obtain the real-time output current of the charging pile, substitute it into the tenth fitting equation to the twelfth fitting equation, and obtain the target value. If the target values ​​are all greater than 0, take the maximum change in battery power as the target, and obtain the corresponding fifth power supply voltage and the output current of the first charging pile based on the tenth fitting surface; obtain the corresponding fifth charger output power and the output current of the second charging pile based on the eleventh fitting surface; obtain the corresponding third charging pile output current based on the twelfth fitting surface and the real-time battery temperature; Based on the average of the first power supply voltage, the second power supply voltage, the third power supply voltage, the fourth power supply voltage and the fifth power supply voltage, adjust the real-time power supply voltage; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, adjust the real-time charging pile output power; based on the average of the first charger output power, the second charger output power, the third charger output power, the fourth charger output power and the fifth charger output power, adjust the real-time charger output power; based on the average of the first charging pile output current, the second charging pile output current and the third charging pile output current, adjust the real-time charging pile output current to maximize the change in battery power per unit time, thereby improving charging efficiency.

[0047] In some embodiments, spline interpolation method, B-spline method, least squares method, polynomial fitting method, non-parametric fitting method, Kriging method, NURBS method, implicit function method, Ferguson bicubic surface method and Bezier method are used for surface fitting, and finally the real-time parameters are adjusted based on the mean of the corresponding parameters.

[0048] In some embodiments, the mains voltage and / or the photovoltaic voltage and / or the wind power voltage are used as the power supply voltage. When two or more voltages are used simultaneously, the grid-connected voltage therebetween is used as the power supply voltage.

[0049] This embodiment further discloses a charging efficiency optimization system based on a charging pile system, which is used to implement any of the above-mentioned charging efficiency optimization methods based on a charging pile system. The charging efficiency optimization system based on a charging pile system includes: The first data acquisition module is used to obtain the power supply voltage, the charging pile output power, the charger output power and the battery temperature, as well as the change in battery power per unit time, which is recorded as the battery power change; Fitting module for: The supply voltage is used as a row vector, and the output power of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a first fitting surface and a first fitting equation; The supply voltage is used as a row vector, and the charger output power is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a second fitting surface and a second fitting equation; The supply voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a third fitting surface and a third fitting equation; The output power of the charging pile is used as a row vector, and the output power of the charger is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fourth fitting surface and a fourth fitting equation; The output power of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fifth fitting surface and a fifth fitting equation; The charger output power is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a sixth fitting surface and a sixth fitting equation; The second data acquisition module is used to obtain the real-time power supply voltage, the real-time charging pile output power, the real-time charger output power and the real-time battery temperature, and substitute the corresponding first fitting equation to the sixth fitting equation to obtain the target value. If the target values ​​are all greater than 0, the maximum battery power change is taken as the target, and based on the first fitting surface, the corresponding first power supply voltage and the first charging pile output power are obtained; based on the second fitting surface, the corresponding second power supply voltage and the first charger output power are obtained; based on the third fitting surface and the real-time battery temperature, the corresponding third power supply voltage is obtained; based on the fourth fitting surface, the corresponding second charging pile output power and the second charger output power are obtained; based on the fifth fitting surface and the real-time battery temperature, the corresponding third charging pile output power is obtained; based on the sixth fitting surface and the real-time battery temperature, the corresponding third charger output power is obtained; The optimization module is used to adjust the real-time power supply voltage based on the average of the first power supply voltage, the second power supply voltage and the third power supply voltage, adjust the real-time charging pile output power based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, and adjust the real-time charger output power based on the average of the first charger output power, the second charger output power and the third charger output power, so as to maximize the battery charge change per unit time, thereby improving the charging efficiency.

[0050] It should be understood that the above surface fitting operation can use existing software tools, such as the CurveFitting tool in Matlab. The above modules can be existing data detection / measurement devices / sensors or data reading modules of charging pile systems, which can directly obtain the above data.

[0051] It is clear that by obtaining the above-mentioned corresponding parameters in advance through existing equipment, a large amount of test data can be obtained. These test data can be simulation test data in the laboratory or actual measurement or operation data of the charging pile system in practice.

[0052] In some embodiments, a charging circuit is used to adjust the charger output power, such as Figure 2 As shown, the charging circuit includes an input interface CN1, an output interface CN2, a fuse F1, a thermistor RT1, a capacitor C1, a common mode inductor LF1, a capacitor C2, a diode VD1, a diode VD2, a diode VD3, a diode VD4, a capacitor C3, a resistor R4, a resistor R1, a capacitor C4, a diode VD5, a transformer T1, a resistor R55, a capacitor C55, a diode VD60, a capacitor C18, a resistor R45, a diode VD70, a capacitor C11, a resistor R11, a capacitor C10, a resistor R12, a capacitor C6, a resistor R10, a resistor R13, an optocoupler IC4, a capacitor C7, an oscillation chip IC1, a resistor R6, a capacitor C8, a resistor R8, a field effect transistor VT1, and a resistor R5, resistor R2, diode VD6, resistor R5, resistor R7, resistor R16, resistor R19, resistor R14, voltage regulator chip IC2, capacitor C12, resistor R17, variable resistor RP1, resistor RP2, capacitor C13, resistor R40, diode VD18, diode VZD2, resistor R52, resistor R35, dual-color light emitting diode LED2, resistor R34, transistor VT2, fan FAN, resistor R33, resistor R10, capacitor C21, operational amplifier IC3, resistor R26, resistor R27, resistor R25, resistor R31, light emitting diode LED1, capacitor C60, diode VZD1, resistor R38, diode VD10, capacitor C19 and resistor R60; Pin 2 of the input interface CN1 is connected to one end of the fuse F1, pin 1 of the input interface CN1 is connected to one end of the thermistor RT1, the other end of the fuse F1 is connected to one end of the capacitor C1 and one end of one side of the common-mode inductor LF1, the other end of the thermistor RT1 is connected to the other end of the capacitor C1 and one end of the other side of the common-mode inductor LF1, the other end of one side of the common-mode inductor LF1 is connected to one end of the capacitor C2, the cathode of the diode VD1 and the anode of the diode VD3, the other end of the other side of the common-mode inductor LF1 is connected to the other end of the capacitor C1, the cathode of the diode VD2 and the anode of the diode VD4, the cathode of the diode VD3 is connected to the cathode of the diode VD4. The positive electrode of the diode VD4 is connected to the positive electrode of the capacitor C3, one end of the resistor R4, one end of the resistor R1, one end of the capacitor C4, the pin 12 of the transformer T1 and the grounded capacitor C20. The positive electrode of the diode VD2 is connected to the positive electrode of the diode VD1 and the negative electrode of the capacitor C3 and then grounded. The other end of the resistor R4 is connected to one end of the resistor R2, the grounded capacitor C11, the collector pin of the optocoupler IC4 and the pin 7 of the oscillation chip IC1. The other end of the resistor R2 is connected to the negative electrode of the diode VD6, the positive electrode of the diode VD6 is connected to the pin 9 of the transformer T1, the pin 8 of the transformer T1 is grounded, and the other end of the resistor R1 is connected to the other end of the capacitor C4. The positive electrode of the diode VD5 is connected to the pin 10 of the transformer T1 and the D electrode of the field effect tube VT1, the S electrode of the field effect tube VT1 is connected to one end of the resistor R5, one end of the resistor R8 and the grounded resistor R7, the other end of the resistor R8 is connected to the pin 3 of the oscillation chip IC1 and the grounded capacitor C8, the G electrode of the field effect tube VT1 is connected to one end of the resistor R6 and the other end of the resistor R5, the other end of the resistor R6 is connected to the pin 6 of the oscillation chip IC1, the pin 1 of the oscillation chip IC1 is connected to one end of the capacitor C10 and one end of the resistor R11, and the other end of the capacitor C10 is connected to the pin 2 of the oscillation chip IC1. , the other end of the resistor R11 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to the emitter pin of the optocoupler IC4 and the grounded resistor R13, the pin 8 of the oscillation chip IC1 is connected to one end of the resistor R10 and the grounded capacitor C6, the other end of the resistor R10 is connected to the pin 4 of the oscillation chip IC1 and the grounded capacitor C7, the pin 5 of the oscillation chip IC1 is grounded, the anode pin of the optocoupler IC4 is connected to one end of the resistor R14, the cathode pin of the optocoupler IC4 is connected to one end of the capacitor C12 and the pin 3 of the voltage stabilizing chip IC2, the pin 2 of the voltage stabilizing chip IC2 is connected to the first fixed end and the sliding end of the variable resistor RP1 and then grounded,Pin 1 of the voltage stabilizing chip IC2 is connected to one end of the resistor R17, the other end of the capacitor C12, the first fixed end of the variable resistor RP2, one end of the capacitor C13 and one end of the resistor R19, the second fixed end of the variable resistor is connected to the other end of the resistor R17, the other end of the capacitor C13 is connected to one end of the resistor R40, the second fixed end and the sliding end of the variable resistor RP2, the other end of the resistor R40 is connected to the cathode of the diode VD18, the anode of the diode VD18 is connected to the cathode of the diode VZD2 and one end of the resistor R52, the anode of the diode VZD2 is grounded, and the other end of the resistor R52 is connected to the cathode of the diode VZD2. The first embodiment is connected to one end of the resistor R335 and pin 7 of the operational amplifier IC3, the other end of the resistor R35 is connected to one end of the two-color light emitting diode LED2, the other end of the two-color light emitting diode LED2 is connected to one end of the resistor R34, the other end of the resistor R19 is connected to one end of the resistor R16, the other end of the resistor R16 and the other end of the resistor R14 are connected to one end of the resistor R38, the positive electrode of the diode VD70, the negative electrode of the diode VD60, the grounding resistor R45 and the grounding capacitor C18, the positive electrode of the diode VD60 is connected to one end of the resistor R55 and pin 6 of the transformer T1, and the The other end of the resistor R55 is connected to the grounded capacitor C55, the pin 3 of the transformer T1 is connected to the positive electrode of the diode VD10, the cathode of the diode VD10 is connected to one end of the resistor R60 and the grounded capacitor C19, the cathode of the diode VD70 is connected to one end of the output interface CN2, the other end of the output interface CNN2 is connected to one end of the resistor R10 and the grounded resistor R33, the other end of the resistor R10 is connected to the pin 3 of the operational amplifier IC3 and the grounded capacitor C21, the other end of the resistor R60 is connected to the collector of the transistor VT2, and the emitter of the transistor VT2 is connected to the fan FAN The base of the transistor VT2 is connected to the other end of the resistor R34, the pin 1 and the pin 6 of the op amp IC3, the other end of the resistor R38 is connected to one end of the resistor R31, one end of the resistor R25, the pin 8 of the op amp IC3, the grounded diode VZD1 and the grounded capacitor C60, the other end of the resistor R31 is connected to the positive electrode of the light emitting diode LED1, the negative electrode of the light emitting diode LED1 is grounded, the other end of the resistor R25 is connected to one end of the resistor R27 and the grounded diode VD12, the other end of the resistor R27 is connected to the pin 5 and the pin 2 of the op amp IC3, and the grounded resistor R26.

[0053] In some embodiments, the model of the operational amplifier IC3 is LM358, and the model of the oscillator chip IC1 is KA3842.

[0054] In some embodiments, the resistor R4 , the resistor R2 , the resistor R60 , the resistor R10 , the resistor R16 , and the resistor R14 may be variable resistors to facilitate adjusting the output power of the charger.

[0055] In some embodiments, the resistance value of the resistor R4, the resistance value of the resistor R2, the resistance value of the resistor R60, the resistance value of the resistor R10, the resistance value of the resistor R16, and the resistance value of the resistor R14 are obtained, which are the first resistance value, the second resistance value, the third resistance value, the fourth resistance value, the fifth resistance value, and the sixth resistance value, respectively; The first resistance value is used as a row vector, and the charger output power is used as a column vector to construct a matrix to import the battery power change, perform surface fitting, and obtain a first resistance value fitting surface; The second resistance value is used as a row vector, and the charger output power is used as a column vector to construct a matrix to import the battery power change, perform surface fitting, and obtain a second resistance value fitting surface; The third resistance value is used as a row vector, and the charger output power is used as a column vector to construct a matrix to import the battery power change, perform surface fitting, and obtain a third resistance value fitting surface; The fourth resistance value is used as a row vector, and the charger output power is used as a column vector to construct a matrix to import the battery power change, and perform surface fitting to obtain a fourth resistance value fitting surface; The fifth resistance value is used as a row vector, and the charger output power is used as a column vector to construct a matrix to import the battery power change, perform surface fitting, and obtain a fifth resistance value fitting surface; The sixth resistance value is used as a row vector, and the charger output power is used as a column vector to construct a matrix to import the battery power change, perform surface fitting, and obtain a sixth resistance value fitting surface; Based on the real-time charger output power, with the maximum battery charge change as the goal, based on the first resistance value fitting surface to the sixth resistance value fitting surface, the corresponding reference values ​​of the first resistance value to the sixth resistance value are obtained, and based on the reference values, the first resistance value to the sixth resistance value are adjusted.

[0056] The above-described embodiments are used to illustrate the present invention, not to limit the present invention, so changes in the exemplified values ​​or replacement of equivalent elements should still fall within the scope of the present invention.

[0057] From the above detailed description, it can be understood by those skilled in the art that the present invention can indeed achieve the aforementioned objectives and is in compliance with the provisions of the Patent Law.

[0058] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0059] It should be noted that the above description of the relevant process is only for example and explanation, and does not limit the scope of application of this specification. For those skilled in the art, various modifications and changes can be made to the process under the guidance of this specification. However, these modifications and changes are still within the scope of this specification.

[0060] The basic concepts have been described above. Obviously, for those of ordinary skill in the art who have read this application, the above invention disclosure is only for example and does not constitute a limitation of this application. Although not explicitly stated here, those of ordinary skill in the art may make various modifications, improvements and amendments to this application. Such modifications, improvements and amendments are suggested in this application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of this application.

[0061] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0062] In addition, it will be understood by those skilled in the art that various aspects of the present application may be illustrated and described by a number of patentable categories or situations, including any new and useful process, machine, product or combination of substances, or any new and useful improvement thereof. Therefore, various aspects of the present application may be implemented entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as a "unit", "module" or "system". In addition, various aspects of the present application may take the form of a computer program product embodied in one or more computer-readable media, wherein computer-readable program code is contained therein.

[0063] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this application. For example, although the implementation of the various components described above can be embodied in a hardware device, it can also be implemented as a pure software solution, for example, installation on an existing server or mobile device.

[0064] Similarly, it should be noted that in order to simplify the description disclosed in this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of the application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this method of the application should not be interpreted as reflecting the intention that the claimed object requires more features than those explicitly stated in each claim. On the contrary, the subject of the invention should have fewer features than the above single embodiment.

Claims

1. A charging efficiency optimization method based on a charging pile system, characterized in that: include: Obtain the power supply voltage, charging pile output power, charger output power and battery temperature, as well as the change in battery power per unit time, which is recorded as the battery power change; The supply voltage is used as a row vector, and the output power of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a first fitting surface and a first fitting equation; The supply voltage is used as a row vector, and the charger output power is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a second fitting surface and a second fitting equation; The supply voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a third fitting surface and a third fitting equation; The output power of the charging pile is used as a row vector, and the output power of the charger is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fourth fitting surface and a fourth fitting equation; The output power of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fifth fitting surface and a fifth fitting equation; The charger output power is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a sixth fitting surface and a sixth fitting equation; Obtain the real-time power supply voltage, the real-time charging pile output power, the real-time charger output power and the real-time battery temperature, and substitute them into the corresponding first to sixth fitting equations to obtain the target values. If the target values ​​are all greater than 0, take the maximum battery power change as the target, and based on the first fitting surface, obtain the corresponding first power supply voltage and the first charging pile output power; based on the second fitting surface, obtain the corresponding second power supply voltage and the first charger output power; based on the third fitting surface and the real-time battery temperature, obtain the corresponding third power supply voltage; Based on the fourth fitting surface, the corresponding second charging pile output power and the second charger output power are obtained; based on the fifth fitting surface and the real-time battery temperature, the corresponding third charging pile output power is obtained; Based on the sixth fitting surface and the real-time battery temperature, obtaining a corresponding output power of the third charger; Based on the average of the first power supply voltage, the second power supply voltage and the third power supply voltage, the real-time power supply voltage is adjusted; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, the real-time charging pile output power is adjusted; based on the average of the first charger output power, the second charger output power and the third charger output power, the real-time charger output power is adjusted to maximize the change in battery power per unit time, thereby improving charging efficiency.

2. The charging efficiency optimization method based on the charging pile system according to claim 1 is characterized in that: Get the output voltage of the charging pile; The power supply voltage is used as a row vector, and the charging pile output voltage is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a seventh fitting surface and a seventh fitting equation; The charger output power is used as a row vector, and the charging pile output voltage is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain an eighth fitting surface and an eighth fitting equation; The charging pile output voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a ninth fitting surface and a ninth fitting equation; Obtain the real-time output voltage of the charging pile, substitute it into the seventh fitting equation to the ninth fitting equation, and obtain the target value. If the target values ​​are all greater than 0, take the maximum change in battery power as the target, and obtain the corresponding fourth power supply voltage and the first charging pile output voltage based on the seventh fitting surface; Based on the eighth fitting surface, the corresponding output power of the fourth charger and the output voltage of the second charging pile are obtained; based on the ninth fitting surface and the real-time battery temperature, the corresponding output voltage of the third charging pile is obtained; Based on the average of the first power supply voltage, the second power supply voltage, the third power supply voltage and the fourth power supply voltage, adjust the real-time power supply voltage; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, adjust the real-time charging pile output power; based on the average of the first charger output power, the second charger output power, the third charger output power and the fourth charger output power, adjust the real-time charger output power; based on the average of the first charging pile output voltage, the second charging pile output voltage and the third charging pile output voltage, adjust the real-time charging pile output voltage to maximize the change in battery power per unit time, thereby improving charging efficiency.

3. The charging efficiency optimization method based on the charging pile system according to claim 1 is characterized in that: Get the output current of the charging pile; The supply voltage is used as a row vector, and the output current of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a tenth fitting surface and a tenth fitting equation; The charger output power is used as a row vector, and the charging pile output current is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain an eleventh fitting surface and an eleventh fitting equation; The output current of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a twelfth fitting surface and a twelfth fitting equation; Obtain the real-time output current of the charging pile, substitute it into the tenth fitting equation to the twelfth fitting equation, and obtain the target value. If the target values ​​are all greater than 0, take the maximum change in battery power as the target, and obtain the corresponding fifth power supply voltage and the output current of the first charging pile based on the tenth fitting surface; obtain the corresponding fifth charger output power and the output current of the second charging pile based on the eleventh fitting surface; Based on the twelfth fitting surface and the real-time battery temperature, obtaining a corresponding output current of the third charging pile; Based on the average of the first power supply voltage, the second power supply voltage, the third power supply voltage, the fourth power supply voltage and the fifth power supply voltage, adjust the real-time power supply voltage; based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, adjust the real-time charging pile output power; based on the average of the first charger output power, the second charger output power, the third charger output power, the fourth charger output power and the fifth charger output power, adjust the real-time charger output power; based on the average of the first charging pile output current, the second charging pile output current and the third charging pile output current, adjust the real-time charging pile output current to maximize the change in battery power per unit time, thereby improving charging efficiency.

4. The charging efficiency optimization method based on the charging pile system according to claim 1 is characterized in that: Spline interpolation method, B-spline method, least squares method, polynomial fitting method, non-parametric fitting method, Kriging method, NURBS method, implicit function method, Ferguson bicubic surface method and Bezier method are used for surface fitting respectively, and finally the real-time parameters are adjusted based on the mean of the corresponding parameters.

5. The charging efficiency optimization method based on the charging pile system according to claim 1 is characterized in that: The mains voltage and / or photovoltaic voltage and / or wind power voltage are used as the power supply voltage. When two or more voltages are used at the same time, the grid-connected voltage between them is used as the power supply voltage.

6. The charging efficiency optimization system based on the charging pile system is characterized by: Used to implement the charging efficiency optimization method based on the charging pile system according to any one of claims 1 to 5, the charging efficiency optimization system based on the charging pile system comprises: The first data acquisition module is used to obtain the power supply voltage, the charging pile output power, the charger output power and the battery temperature, as well as the change in battery power per unit time, which is recorded as the battery power change; Fitting module for: The supply voltage is used as a row vector, and the output power of the charging pile is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a first fitting surface and a first fitting equation; The supply voltage is used as a row vector, and the charger output power is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a second fitting surface and a second fitting equation; The supply voltage is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a third fitting surface and a third fitting equation; The output power of the charging pile is used as a row vector, and the output power of the charger is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fourth fitting surface and a fourth fitting equation; The output power of the charging pile is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a fifth fitting surface and a fifth fitting equation; The charger output power is used as a row vector, and the battery temperature is used as a column vector to form a matrix, and the battery power change is imported to perform surface fitting to obtain a sixth fitting surface and a sixth fitting equation; The second data acquisition module is used to obtain the real-time power supply voltage, the real-time charging pile output power, the real-time charger output power and the real-time battery temperature, and substitute the corresponding first fitting equation to the sixth fitting equation to obtain the target value. If the target values ​​are all greater than 0, the maximum battery power change is taken as the target, and based on the first fitting surface, the corresponding first power supply voltage and the first charging pile output power are obtained; based on the second fitting surface, the corresponding second power supply voltage and the first charger output power are obtained; based on the third fitting surface and the real-time battery temperature, the corresponding third power supply voltage is obtained; based on the fourth fitting surface, the corresponding second charging pile output power and the second charger output power are obtained; based on the fifth fitting surface and the real-time battery temperature, the corresponding third charging pile output power is obtained; based on the sixth fitting surface and the real-time battery temperature, the corresponding third charger output power is obtained; The optimization module is used to adjust the real-time power supply voltage based on the average of the first power supply voltage, the second power supply voltage and the third power supply voltage, adjust the real-time charging pile output power based on the average of the first charging pile output power, the second charging pile output power and the third charging pile output power, and adjust the real-time charger output power based on the average of the first charger output power, the second charger output power and the third charger output power, so as to maximize the battery charge change per unit time, thereby improving the charging efficiency.

7. The charging efficiency optimization system based on the charging pile system according to claim 6 is characterized in that: The output power of the charger is adjusted using a charging circuit, wherein the charging circuit includes an input interface CN1, an output interface CN2, a fuse F1, a thermistor RT1, a capacitor C1, a common mode inductor LF1, a capacitor C2, a diode VD1, a diode VD2, a diode VD3, a diode VD4, a capacitor C3, a resistor R4, a resistor R1, a capacitor C4, a diode VD5, a transformer T1, a resistor R55, a capacitor C55, a diode VD60, a capacitor C18, a resistor R45, a diode VD70, a capacitor C11, a resistor R11, a capacitor C10, a resistor R12, a capacitor C6, a resistor R10, a resistor R13, an optocoupler IC4, a capacitor C7, an oscillation chip IC1, a resistor R6, a capacitor C8, a resistor R8, a field effect The following should be used: VT1, resistor R5, resistor R2, diode VD6, resistor R5, resistor R7, resistor R16, resistor R19, resistor R14, voltage regulator chip IC2, capacitor C12, resistor R17, variable resistor RP1, resistor RP2, capacitor C13, resistor R40, diode VD18, diode VZD2, resistor R52, resistor R35, two-color light emitting diode LED2, resistor R34, transistor VT2, fan FAN, resistor R33, resistor R10, capacitor C21, operational amplifier IC3, resistor R26, resistor R27, resistor R25, resistor R31, light emitting diode LED1, capacitor C60, diode VZD1, resistor R38, diode VD10, capacitor C19 and resistor R60; Pin 2 of the input interface CN1 is connected to one end of the fuse F1, pin 1 of the input interface CN1 is connected to one end of the thermistor RT1, the other end of the fuse F1 is connected to one end of the capacitor C1 and one end of one side of the common-mode inductor LF1, the other end of the thermistor RT1 is connected to the other end of the capacitor C1 and one end of the other side of the common-mode inductor LF1, the other end of one side of the common-mode inductor LF1 is connected to one end of the capacitor C2, the cathode of the diode VD1 and the anode of the diode VD3, the other end of the other side of the common-mode inductor LF1 is connected to the other end of the capacitor C1, the cathode of the diode VD2 and the anode of the diode VD4, the cathode of the diode VD3 is connected to the cathode of the diode VD4. The positive electrode of the diode VD4 is connected to the positive electrode of the capacitor C3, one end of the resistor R4, one end of the resistor R1, one end of the capacitor C4, the pin 12 of the transformer T1 and the grounded capacitor C20. The positive electrode of the diode VD2 is connected to the positive electrode of the diode VD1 and the negative electrode of the capacitor C3 and then grounded. The other end of the resistor R4 is connected to one end of the resistor R2, the grounded capacitor C11, the collector pin of the optocoupler IC4 and the pin 7 of the oscillation chip IC1. The other end of the resistor R2 is connected to the negative electrode of the diode VD6, the positive electrode of the diode VD6 is connected to the pin 9 of the transformer T1, the pin 8 of the transformer T1 is grounded, and the other end of the resistor R1 is connected to the other end of the capacitor C4. The positive electrode of the diode VD5 is connected to the pin 10 of the transformer T1 and the D electrode of the field effect tube VT1, the S electrode of the field effect tube VT1 is connected to one end of the resistor R5, one end of the resistor R8 and the grounded resistor R7, the other end of the resistor R8 is connected to the pin 3 of the oscillation chip IC1 and the grounded capacitor C8, the G electrode of the field effect tube VT1 is connected to one end of the resistor R6 and the other end of the resistor R5, the other end of the resistor R6 is connected to the pin 6 of the oscillation chip IC1, the pin 1 of the oscillation chip IC1 is connected to one end of the capacitor C10 and one end of the resistor R11, and the other end of the capacitor C10 is connected to the pin 2 of the oscillation chip IC1. , the other end of the resistor R11 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to the emitter pin of the optocoupler IC4 and the grounded resistor R13, the pin 8 of the oscillation chip IC1 is connected to one end of the resistor R10 and the grounded capacitor C6, the other end of the resistor R10 is connected to the pin 4 of the oscillation chip IC1 and the grounded capacitor C7, the pin 5 of the oscillation chip IC1 is grounded, the anode pin of the optocoupler IC4 is connected to one end of the resistor R14, the cathode pin of the optocoupler IC4 is connected to one end of the capacitor C12 and the pin 3 of the voltage stabilizing chip IC2, the pin 2 of the voltage stabilizing chip IC2 is connected to the first fixed end and the sliding end of the variable resistor RP1 and then grounded,Pin 1 of the voltage stabilizing chip IC2 is connected to one end of the resistor R17, the other end of the capacitor C12, the first fixed end of the variable resistor RP2, one end of the capacitor C13 and one end of the resistor R19, the second fixed end of the variable resistor is connected to the other end of the resistor R17, the other end of the capacitor C13 is connected to one end of the resistor R40, the second fixed end and the sliding end of the variable resistor RP2, the other end of the resistor R40 is connected to the cathode of the diode VD18, the anode of the diode VD18 is connected to the cathode of the diode VZD2 and one end of the resistor R52, the anode of the diode VZD2 is grounded, and the other end of the resistor R52 is connected to the cathode of the diode VZD2. The first embodiment is connected to one end of the resistor R335 and pin 7 of the operational amplifier IC3, the other end of the resistor R35 is connected to one end of the two-color light emitting diode LED2, the other end of the two-color light emitting diode LED2 is connected to one end of the resistor R34, the other end of the resistor R19 is connected to one end of the resistor R16, the other end of the resistor R16 and the other end of the resistor R14 are connected to one end of the resistor R38, the positive electrode of the diode VD70, the negative electrode of the diode VD60, the grounding resistor R45 and the grounding capacitor C18, the positive electrode of the diode VD60 is connected to one end of the resistor R55 and pin 6 of the transformer T1, and the The other end of the resistor R55 is connected to the grounded capacitor C55, the pin 3 of the transformer T1 is connected to the positive electrode of the diode VD10, the cathode of the diode VD10 is connected to one end of the resistor R60 and the grounded capacitor C19, the cathode of the diode VD70 is connected to one end of the output interface CN2, the other end of the output interface CNN2 is connected to one end of the resistor R10 and the grounded resistor R33, the other end of the resistor R10 is connected to the pin 3 of the operational amplifier IC3 and the grounded capacitor C21, the other end of the resistor R60 is connected to the collector of the transistor VT2, and the emitter of the transistor VT2 is connected to the fan FAN The base of the transistor VT2 is connected to the other end of the resistor R34, the pin 1 and the pin 6 of the op amp IC3, the other end of the resistor R38 is connected to one end of the resistor R31, one end of the resistor R25, the pin 8 of the op amp IC3, the grounded diode VZD1 and the grounded capacitor C60, the other end of the resistor R31 is connected to the positive electrode of the light emitting diode LED1, the negative electrode of the light emitting diode LED1 is grounded, the other end of the resistor R25 is connected to one end of the resistor R27 and the grounded diode VD12, the other end of the resistor R27 is connected to the pin 5 and the pin 2 of the op amp IC3, and the grounded resistor R26.

8. The charging efficiency optimization system based on the charging pile system according to claim 7 is characterized in that: The model of the operational amplifier IC3 is LM358, and the model of the oscillator chip IC1 is KA3842.

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