CN102290852A - Charging control method and system - Google Patents
Charging control method and system Download PDFInfo
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Abstract
The invention provides a charging control method, which comprises that: a power grid load is judged whether to reach a preset threshold value, and if the power grid load is judged whether to reach the preset threshold value, an early warning signal is transmitted to a master charging control system; the master charging control system queries a preset total charging load control table according to the early warning signal to acquire total charging load control information, generates power allocation information by using the total charging load control information and transmits the power allocation information to charging units; after receiving the power allocation information, each charging unit performs modulation, and transmits modulated power information to an on-vehicle charging device; and the on-vehicle charging device correspondingly regulates current charging current according to the power information. The invention also provides a charging control system. By the method and the system, the problems of impact and electric energy wasting possibly caused to a power grid by the charging of an electric vehicle at a charging station or a charging post are effectively solved.
Description
Technical field
The present invention relates to electric vehicle charging technique field, particularly a kind of charge control method and system.
Background technology
Electric vehicle is the new traffic tool that rises in recent years, and it is favored by people extensively with energy-conserving and environment-protective, easy to use, unique advantage such as ambient noise is little.Electric vehicle provides power with electro-motor, and the driving electric of electro-motor derives from the inner storage battery of installing that discharges and recharges of car body.For strengthening the continuation of the journey mileage of storage battery, the capacity of car battery is generally bigger, and no matter the normal domestic use power supply often can not be satisfied charging demand, thereby must build special charging station or charging pile for the still actual power supply capacity of security consideration.The composition structure chart of intelligent charge system that accompanying drawing 1 is depicted as is a kind of " drag many ".The master control system of this intelligent charge system drives a plurality of charhing units the battery of electric motor car is charged; instruction by each communication unit and data interaction have realized charging object one is dragged many scale expansions, system simple for structure, construction cost is cheap, extensibility is strong.But, owing to there are a plurality of charging objects simultaneously, the charging demand of each charging object is all bigger, and the network load of distribution center is limited in the regular period, if the charging object increases sharply in short-term, network load can not increase thereupon, very likely causes mains breakdown, therefore, must adopt a kind of effective ways to realize the orderly charging of a plurality of charhing units; Similarly, when a large amount of minimizing suddenly of the charging object in the intelligent charge system, power supply level is greater than electricity consumption level, because electric power can not be stored in a large number, to cause unnecessary waste of electric energy, for guaranteeing that the steady electricity consumption of intelligent charge system also must control the charging process of a plurality of charhing units,, the actual load of itself and distribution center is adapted with dynamic adjustments intelligent charge system.
Summary of the invention
In view of this, the present invention proposes a kind of charge control method and system, by communicating by letter between charging master control system and the vehicle-mounted charging device, has realized effective control of charging process.
Charge control method provided by the invention comprises:
Read network load information, and judge whether this network load reaches pre-set threshold value, if then send corresponding early warning signal to the charging master control system;
Described charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table, so that use this charging load overall control information to generate power allocation information, and this power allocation information passed to corresponding charhing unit respectively according to preset rules; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
After described charhing unit receives described power allocation information, this power allocation information is modulated, and the power information after will modulating passes to vehicle-mounted charging device;
Described vehicle-mounted charging device carries out demodulation to the described modulated power information that receives, calculate the qualification charging current according to the power information that demodulates, and judge current charging current and described qualification charging current size, according to the current charging current of the corresponding adjustment of judged result.
Preferably, describedly read the power distribution network information on load and judge that the step whether this network load reaches pre-set threshold value carries out in real time or periodically.
Preferably, described step according to preset rules generation power allocation information comprises:
Described charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Described charhing unit passes to described vehicle-mounted charging device after the power demand investigation instruction that receives is modulated;
After described vehicle-mounted charging device demodulation obtains described power demand investigation instruction, pass to described charging master control system by described charhing unit after the current charge power information modulation with vehicle-mounted charging device;
After described master control system obtains the current charge power message of each vehicle-mounted charging device, according to the ratio generation power allocation information of described charging load overall control information according to each vehicle-mounted charging device current power.
Preferably, power information after described charhing unit will be modulated passes to before the described vehicle-mounted charging device, described method also comprises: described charhing unit sends the instruction of shaking hands to described vehicle-mounted charging device, the described instruction of shaking hands is used to judge whether vehicle-mounted charging device is in normal operating conditions, if then carry out the step that the power information after transmission is modulated is given described vehicle-mounted charging device; If not, then send the status message of described vehicle-mounted charging device to described charging master control system, described charhing unit was set to not distribute power rating after described charging master control system received this status message, and regenerated power allocation information.
Preferably, the information transmission between described charhing unit and the vehicle-mounted charging device uses charging electric wire or CAN bus between described charhing unit and the vehicle-mounted charging device to transmit.
A kind of charge control system provided by the invention comprises:
Network load judging unit, charging master control system, at least one charhing unit and at least one vehicle-mounted charging device, wherein:
Described network load judging unit is connected with the electrical network of distribution center, is used to read network load information, and judges whether this network load reaches pre-set threshold value, if then send corresponding early warning signal to described charging master control system;
Described charging master control system is connected with described network load judging unit, be used for obtaining charging load overall control information according to described early warning signal inquiry preset charged load overall control table, so that use this charging load overall control information to generate power allocation information, and this power allocation information passed to corresponding described charhing unit respectively according to preset rules; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
Described charhing unit is connected with described charging master control system, be used for the described power allocation information that receives is modulated, and the power information after will modulating passes to described vehicle-mounted charging device;
Described vehicle-mounted charging device is connected with described charhing unit, be used for the described modulated power information that receives is carried out demodulation, calculate the qualification charging current according to the power information that demodulates, and judge current charging current and described qualification charging current size, according to the current charging current of the corresponding adjustment of judged result.
Preferably, described network load judging unit reads network load information in real time or periodically and judges whether this network load reaches pre-set threshold value.
Preferably, described charging master control system comprises according to the step that preset rules generates power allocation information:
Described charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Described charhing unit passes to described vehicle-mounted charging device after the power demand investigation instruction that receives is modulated;
After described vehicle-mounted charging device demodulation obtains described power demand investigation instruction, pass to described charging master control system by described charhing unit after the current charge power information modulation with vehicle-mounted charging device;
After described charging master control system obtains the current power message of each vehicle-mounted charging device, according to the ratio generation power allocation information of described charging load overall control information according to the current charge power of each vehicle-mounted charging device.
Preferably, described charhing unit is used for that also the power information after the modulation is passed to described vehicle-mounted charging device and sends the instruction of shaking hands to described vehicle-mounted charging device before, the described instruction of shaking hands is used to judge whether vehicle-mounted charging device is in normal operating conditions, if then carry out the step that the power information after transmission is modulated is given described vehicle-mounted charging device; If not, then send the status message of described vehicle-mounted charging device to described charging master control system; Then:
Described charging master control system is used for that described charhing unit is set to not distribute power rating after receiving this status message, and regenerates power allocation information.
Preferably, the information transmission between described charhing unit and the vehicle-mounted charging device uses charging electric wire or CAN bus between described charhing unit and the vehicle-mounted charging device to transmit.
Preferably, described network load judging unit is integrated in the described charging master control system.
Preferably, described charging master control system comprises query unit, main control unit, memory cell and first communication module, wherein:
Described query unit is used to receive the early warning signal that described network load judging unit sends, and inquires about described preset charged load overall control table acquisition charging load overall control information according to this early warning signal;
Described main control unit is used to use described charging load overall control information to generate power allocation information according to preset rules, and by first communication module this power allocation information is passed to described charhing unit;
Described memory cell is used for storing in advance charging load overall control information.
Preferably, described charhing unit comprises modulation module, second communication module, and wherein: described modulation module is used for the power information of described charging master control system transmission is modulated, and passes to described vehicle-mounted charging device by described second communication module.
Preferably, described vehicle-mounted charging device comprises demodulation module, computing module, judge module, current detection module and charging current adjusting module, wherein:
Described demodulation module is used for the described modulation signal that comprises power information is carried out demodulation, and the power information after the demodulation is passed to computing module;
Described computing module is used for calculating the qualification charging current according to described power information;
Qualification charging current and the detected current charging current of current detection module that described judge module is used for computing module is calculated compare, and trigger the charging current adjusting module;
Described charging current adjusting module is used for according to the current charging current of the corresponding adjustment of judged result.
Technical scheme of the present invention changes the network load that the charging object carries out distribution center in the charging process by monitoring a plurality of charhing units, the network load situation is reflected to the charging master control system, generate power allocation information by the charging master control system, and then utilize this power allocation information that the charging current of each charging object is made real-time adjustment, efficiently solve impact and waste of electric energy that electric motor car may cause to electrical network when charging station or charging pile charging.
Description of drawings
In order to be illustrated more clearly in patent working example of the present invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiment of patent of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of " one drag many " intelligent charge system;
Fig. 2 is the flow chart of the embodiment of method of the present invention;
Fig. 3 generates the flow chart of power division table step for another embodiment of method of the present invention;
Fig. 4 sends the flow chart of the instruction step of shaking hands for another embodiment of method of the present invention;
Fig. 5 is the work schematic diagram of the embodiment of system of the present invention;
Fig. 6 is the structure chart of the embodiment of system of the present invention;
Fig. 7 is the structure chart of charging master control system of the embodiment of system of the present invention;
Fig. 8 is the structure chart of charhing unit of another embodiment of system of the present invention;
Fig. 9 is the structure chart of vehicle-mounted charging device of another embodiment of system of the present invention.
Embodiment
Below in conjunction with the accompanying drawing of the embodiment of the invention, the technical scheme of the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills belong to protection scope of the present invention not making the every other embodiment that is obtained under the creative work prerequisite.
For the purpose of the narration various embodiments of the invention are convenient, earlier with the present invention based on " one drag many " intelligent charge system simply introduce.Accompanying drawing 1 is depicted as the structure chart of such charging system.This charging system comprises charging master control system 101, at least one charhing unit 102 and vehicle-mounted charging device 103, master control system 101 connects a plurality of charhing units 102, each charhing unit 102 connects a vehicle-mounted charging device 103, and vehicle-mounted charging device 103 connects the rechargeable battery of electric vehicle.This charging system has been realized the charge construction of " drag many ".But, say as background technology part of the present invention, may there be the situation of unexpected increase or minimizing in the charging object of the charhing unit under this framework, influence provides the stable operation of the electrical network of electric energy for it, thereby a kind of charge control method of needs, can guarantee the impact of electrical network lessly, can guarantee the efficient utilization of electric energy again, thereby reduce waste of energy.The method that the embodiment of the invention provides efficiently solves this problem.
It shown in the accompanying drawing 2 flow chart of method embodiment of the present invention.This method comprises:
Step S201: the network load judging unit reads network load information;
The network load judging unit reads network load information, the monitoring network load changes for guaranteeing that the grid balance sound and stable operation is most important: because power supply level remained unchanged in the regular period, when electricity consumption level surpasses power supply capacity, instrument may occur burning, damage grid equipment, equivalent risk unusually trips, the battery capacity of electric vehicle is huge, will increase above-mentioned risk greatly in case a plurality of rechargeable batteries are charged simultaneously; When electricity consumption level significantly was lower than power supply capacity, because electric energy can't global storage, unnecessary electric energy can not effectively utilize, and caused waste, in case Chong Dian a plurality of rechargeable batteries stop to charge simultaneously, electricity consumption level will descend rapidly, and utilization rate of electrical decreases.
Step S202: judge whether this network load reaches pre-set threshold value, if, then send corresponding early warning signal to the charging master control system, enter step S202; If not, then return step S201;
As mentioned above, from power grid security, the angle of efficient operation is considered, the charging master control system charges normal in the process rechargeable battery by charhing unit, provide the load level of the electrical network of electric energy can not be low excessively to charhing unit, must be on default minimum threshold values, can not be too high, must establish under the threshold values at maximum prefetch, even according to actual needs, the pre-set threshold value of a plurality of gradients can be arranged, the corresponding a kind of early warning signal of each threshold values, if the network load level reaches some pre-set threshold value, then send corresponding early warning signal, regulate the charge condition of a plurality of charhing units by master control system, to adapt to the needs of network load stable operation to the charging master control system; Corresponding relation between early warning signal and the pre-set threshold value can be provided with according to the statistics of historical charge condition, is provided with after also can taking into full account the actual conditions of rechargeable battery self electric energy number; In the practical application, to the battery of the electric vehicle of charging station or charging pile charging some electric energy still, the electric weight that needs during charging is less, at this moment can turn down corresponding pre-set threshold value.
Step S203: the charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table, so that use this charging load overall control information to generate power allocation information, and this power allocation information passed to corresponding charhing unit respectively according to preset rules; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
Preset charged load overall control table can be set charging load overall control information according to the historical charge condition of this charging system, and these information are corresponding with early warning signal; After the charging master control system receives early warning signal, promptly inquire about this preset charged load overall control table load overall control information of being charged accordingly, this charging load overall control information is the total amount of the charge power of all charhing units of linking to each other with the charging master control system, if early warning signal is " limit for height " type early warning signal, represent that then the charge power summation of all charhing units can not surpass above-mentioned total amount; If early warning signal is " limitting low " type early warning signal, represent that then the charge power summation of all charhing units can not be lower than above-mentioned total amount; The charging master control system obtains after the charging load overall control information according to this information according to preset rules production power division table, and the power information of distributing is sent corresponding charhing unit;
Step S204: after charhing unit receives described power information, this power allocation information is modulated, and the power information after will modulating passes to vehicle-mounted charging device;
Charhing unit is a signal circuit with being connected between the master control system of charging, can transmit information easily, but, owing to need the rechargeable battery that vehicle-mounted charging device connected be charged, what be connected between charhing unit and vehicle-mounted charging device is the charging electric wire, thereby can not directly transmit information, information must be modulated the formation carrier signal, then this carrier signal is transferred to vehicle-mounted charging device by the charging electric wire, concrete modulator approach can be frequency modulation(FM), Modulation and Amplitude Modulation, phase modulated, above-mentioned use charging electric wire carries out the signal transmission manner and is called PLC (Power Line Communication) mode, this data communication carrier that directly utilizes the conduct of existing charging electric wire can significantly reduce the cost of investment of networking; In fact, except that above-mentioned PLC mode, can there be multiple concrete mode to realize communicating by letter between charhing unit and the vehicle-mounted charging device, such as adopting the CAN bus mode, the CAN bus belongs to the category of fieldbus, it is the serial communication network of distributed control of a kind of effective support or real-time control, control system based on the CAN bus has transmission reliably, the real-time height, advantages such as transmission rate is fast, each node of CAN bus equal, promptly any one node is as long as be equipped with the CAN bus control unit and driver can communicate with other nodes that are connected on this CAN bus; The charhing unit of native system and vehicle-mounted charging device can be regarded the node on the CAN bus network as, all can realize mutual data communication by being equipped with CAN bus control unit and driver; Can also adopt wireless mode to realize communicating by letter between charhing unit and the vehicle-mounted charging device, can be wireless technologys such as infrared, bluetooth, ZigBee during specific implementation.
Step S205: vehicle-mounted charging device carries out demodulation to the described modulated power information that receives, and calculates the charging current limit according to the power information that demodulates;
Vehicle-mounted charging device carries out demodulation earlier and obtains above-mentioned power information for receiving carrier information, this power information is used to calculate the charging current limit then, need the numerical value of charging voltage during the calculating of charging current limit, this charging voltage value can be the value of predetermined fixed, also can be detected dynamic electric voltage value.Calculate the charging current limit except that using charging voltage, also can use additive method, the resistance as by the ohmmeter testing circuit utilizes physical rules to calculate the charging current limit then, in a word, embodiments of the invention are not made any particular determination to the concrete grammar that calculates.
Step S206: judge current charging current and described qualification charging current size, according to the current charging current of the corresponding adjustment of judged result.
As mentioned above, because the difference of early warning signal type, power information is also corresponding to change, the adjustment mode of current charging current is different: when power information is " limit for height " type power information, if current charging current is greater than the charging current limit, then adjust the numerical value of current charging current, process ends to described current limit; If current charging current is less than limiting charging current, then: process ends; When power information is " limitting low " type power information, if current charging current is greater than the charging current limit, then: process ends; If current charging current less than limiting charging current, is then adjusted the numerical value of current charging current to described current limit, process ends.
In fact, in the above-mentioned current charging current adjustment process, power information is under " limit for height " type power information situation, except that being benchmark dynamically adjust to current charging current to limit charging current with the size that limits charging current according to current charging current according to mode as mentioned above, can also be before dynamically adjusting current charging current, to limit charging current and the preset charged electric current compares, if it is bigger than preset charged electric current to limit charging current, is that benchmark is adjusted current charging current with the preset charged electric current then; If it is littler than preset charged electric current to limit charging current, be that benchmark is adjusted current charging current still then to limit charging current; Similarly, power information is under " limitting low " type power information situation, also can be according to carrying out conversion as upper type to the benchmark that current charging current is dynamically adjusted.The preset charged electric current here defines in such a manner: suppose the electrical network infinity, in the time of need not considering to limit charging current, the actual charge condition of the rechargeable battery of the electric vehicle that the complete foundation of vehicle-mounted charging device is attached thereto charges, and charging current in such cases is defined as the preset charged electric current.
The adjustment of above-mentioned charging current is to regulate size of current by the time scale that the high frequency of power controlling switch in the fixed cycle turns on and off, the concrete operations flow process is as follows: the service time that increases power switch in the fixed cycle, then the power by this power switch increases, thereby strengthens charging current; In the fixed cycle, reduce the service time of power switch, then pass through the power reduction of this power switch, thereby reduce charging current.
Present embodiment changes the network load that the charging object carries out distribution center in the charging process by monitoring a plurality of charhing units, the network load situation is reflected to the charging master control system, generate power allocation information by the charging master control system, and then utilize this power allocation information that the charging current of each charging object is made real-time adjustment, efficiently solve impact and waste of energy that electric motor car may cause to electrical network when charging station or charging pile charging.In addition, present embodiment is when carrying out the adjustment of current charging current, by considering the relation between preset charged electric current and the qualification charging current, current charging current is adjusted to only state, can improve the useful life of the rechargeable battery of electric vehicle like this.
Read network load information among the foregoing description step S201 and can carry out this action as required, in fact, the variation of network load situation when charging in order accurately to monitor a plurality of charhing units, the present invention preferably carries out above-mentioned steps in real time or periodically, thereby can dynamically adjust the charging process of charhing unit, realize charging control better rechargeable battery.
The foregoing description generates the mode of power allocation information and can select according to actual needs, such as: a plurality of charhing units are compiled upward sequence number, distribute to a certain proportion of charge power of each charhing unit regularly according to sequence number, still carry out in this manner when carrying out next time power division.Yet, because " status " of each charhing unit is equality, the power allocation rules of this fixed priority may can not adapt to actual needs well, therefore, the present invention considers that preferably the actual demand amount of each charhing unit carries out power division, and demand is many, it is many to distribute, and demand is few, distribution is few, can maximally utilise the given gross power of charging load total amount like this, form another embodiment of method of the present invention thus.Each step of this embodiment is except that step S203 and the foregoing description are variant, and other steps are all identical.Referring to accompanying drawing 3, the S303 step of present embodiment specifically comprises:
Step S3031: the charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
Step S3032: the charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Step S3033: charhing unit passes to vehicle-mounted charging device after the power demand investigation instruction that receives is modulated;
Step S3034: after described vehicle-mounted charging device demodulation obtains described power demand investigation instruction, pass to described charhing unit after the current charge power information modulation with vehicle-mounted charging device, described charhing unit carries out demodulation to this information, and the current charge power information of the vehicle-mounted charging device after the demodulation is passed to described charging master control system;
Step S3035: after described master control system obtains the current charge power message of each vehicle-mounted charging device, according to the ratio generation power allocation information of described charging load overall control information according to the current charge power of each vehicle-mounted charging device.
The mode that this embodiment investigates by " democracy " obtains the actual demand situation of each charhing unit, can effectively solve technical problem of the present invention, also can adapt to the needs of practical application better.
In fact; on above-mentioned power division mode basis; the maximum that described charging master control system can also be collected each charhing unit allows charge power; if the power of distributing to each charhing unit according to the above-mentioned method of salary distribution has surpassed the maximum of this charhing unit allow charge power after; just give up this distribution power information; and directly the maximum allowable power of this charhing unit is distributed to each charhing unit, like this, can effectively protect each charhing unit not burnt.
For the sake of clarity, cite an actual example below above-mentioned distribution method is described: suppose that the charging master control system connects two charhing units, it is 4 kilowatts that the maximum of first charhing unit allows charge power, and second the maximum permission of charhing unit charge power is 5 kilowatts; These two charhing units are connected with two vehicle-mounted charging devices respectively, and the current charge power of first vehicle-mounted charging device is 3 kilowatts, and second current charge power of vehicle-mounted charging device is 4 kilowatts, are the roughly process of power division below:
The network load judging unit receives actual load more than or equal to 90% of peak load, sends early warning signal to the charging master control system;
After the charging master control system is received early warning signal, at first issue power investigation instruction to connected two charhing units;
Charhing unit passes to own corresponding vehicle-mounted charging device respectively after the power investigation is instructed;
Vehicle-mounted charging device returns the corresponding charhing unit of giving with the current charge power of oneself respectively;
First charhing unit is passed to the charging master control system for 3 kilowatts with its maximum current power of 4 kilowatts of charge powers and coupled vehicle-mounted charging device that allows, and second charhing unit passed to master control system for 4 kilowatts with its maximum current power of 5 kilowatts of charge powers and coupled vehicle-mounted charging device that allows;
The present cumulative power of charging master control system is 7 kilowatts, equal 6 kilowatts according to the early warning signal inquiry preset charged load overall control table load overall control information of being charged accordingly for the master control system power-limiting, carry out power information according to the current power ratio of vehicle-mounted charging device 1 and 2 and distribute, promptly two vehicle-mounted charging devices are distributed to the power of 18/7 kilowatt and 24/7 kilowatt respectively;
The charging master control system sends to corresponding vehicle-mounted charging device with this power information distribution by charhing unit;
Vehicle-mounted charging device carries out the adjustment of current charging current according to power allocation information.
When the power information after charhing unit will be modulated among above-mentioned two embodiment passes to vehicle-mounted charging device, can directly this information be sent to vehicle-mounted charging device, but, because each electric vehicle all is equipped with vehicle-mounted charging device, charging all will be used this device to the vehicles at every turn, these vehicle-mounted charging devices are used by frequent and many occasion ground, damage probably, if vehicle-mounted charging device damages, the power allocation information that is sent by the charging master control system can not effectively receive, thereby cause the whole control process failure, in addition, the connecting interface between vehicle-mounted charging device and the charhing unit may loose contact also may cause effectively receiving data.For avoiding these situations to occur, the present invention preferably carried out state-detection to vehicle-mounted charging device before transmit power assignment information, confirmed just to send when in good condition above-mentioned power allocation information.After increasing the above-mentioned instruction step of shaking hands, constitute another embodiment of the present invention on aforementioned again two embodiment bases, this embodiment increases the instruction step of shaking hands in the step S204 of first embodiment, and other steps are constant.Referring to accompanying drawing 4, the S204 step after this embodiment changes comprises:
Step S4041: the described power information that charhing unit receiving step S403 sends enters step S4042;
Step S4042: charhing unit sends the instruction back of shaking hands to vehicle-mounted charging device and starts timer, and detects the response message from vehicle-mounted charging device;
Step S4043: judge the response message of whether receiving vehicle-mounted charging device in the scheduled time, if then enter step S4045; If not, execution in step S4043 (a) then: send the status message of described vehicle-mounted charging device to described charging master control system, enter step S4044;
Step S4044: described charhing unit was set to not distribute power rating after described charging master control system received described status message, and regenerated power allocation information, entered step S403;
Step S4045: the power allocation information that step S4041 receives is modulated, and the power information after will modulating passes to vehicle-mounted charging device.
Among the above-mentioned steps S4043,, also can abandon this power allocation information, wait for power allocation information next time if do not receive the response message of vehicle-mounted charging device in the given time; Can also point out the problem at this place to the keeper, keeper's place under repair by triggering warning system.
Above-mentioned three embodiment that introduced method of the present invention, corresponding with it, the invention provides the system that realizes charging control.Shown in the accompanying drawing 5 is the work schematic diagram of system embodiment of the present invention, and in conjunction with this schematic diagram, the structure chart of the embodiment 600 of system of the present invention as shown in Figure 6.This system comprises network load judging unit 601, charging master control system 602, at least one charhing unit 603 and at least one vehicle-mounted charging device 604, wherein:
Network load judging unit 601 is connected with the electrical network of distribution center, is used to read network load information, and judges whether this network load reaches reservation threshold, if then send corresponding early warning signal to described charging master control system;
Charging master control system 602 is connected with network load judging unit 601, be used for obtaining charging load overall control information according to described early warning signal inquiry preset charged load overall control table, so that use this charging load overall control information to generate the power allocation information table, and this power allocation information passed to corresponding described charhing unit respectively according to preset rules; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
Vehicle-mounted charging device 604 is connected with charhing unit 603, be used for the described modulated power information that receives is carried out demodulation, calculate the qualification charging current according to the power information that demodulates, and judge current charging current and described qualification charging current size, according to the current charging current of the corresponding adjustment of judged result.
The concrete course of work of present embodiment will not repeat referring to the description of front to charge control method embodiment herein.
Native system embodiment monitors a plurality of charhing units by the network load judging unit network load that the charging object carries out distribution center in the charging process is changed, the network load situation is reflected to the charging master control system, generate power allocation information by the charging master control system, and then utilize this power allocation information that the charging current of each charging object is made real-time adjustment, efficiently solve impact and waste of electric energy that electric motor car may cause to electrical network when charging station or charging pile charging.
Network load judging unit 601 among the said system embodiment preferably reads network load information in real time or periodically and judges whether this network load reaches reservation threshold, can monitor the variation of network load more exactly like this, thereby dynamically control charging process.
Network load judging unit 601 among the said system embodiment can be used as independently parts and is arranged at outside the charging master control system, also can be integrated in charging master control system inside.
The concrete composition structure of the charging master control system among the said system embodiment can be used any structure form that can finish its function in the prior art, and the structure shown in also can preferred figures 7 is formed.This charging master control system 702 comprises query unit 7021, main control unit 7022, memory cell 7023 and first communication module 7024, wherein:
The concrete composition structure of the charhing unit among the said system embodiment can be used any structure form that can finish its function in the prior art, and the structure shown in also can preferred figures 8 is formed.This charhing unit 803 comprises modulation module 8031, second communication module 8032, wherein: modulation module 8031 is used for the power information that charging master control system 802 is transmitted is modulated to carrier signal, and passes to described vehicle-mounted charging device by second communication module 8032.
The concrete composition structure of the vehicle-mounted charging device among the said system embodiment can be used any structure form that can finish its function in the prior art, and the structure shown in also can preferred figures 9 is formed.This vehicle-mounted charging device 904 comprises demodulation module 9041, computing module 9042, judge module 9043, voltage detection module 9044, current detection module 9045, charging current adjusting module 9046 and AC/DC modular converter 9047, wherein:
Computing module is calculated the qualification charging current to judge module 9043 and current detection module 9045 detected current charging currents compare, and trigger charging current adjusting module 9046.
Charging current adjusting module 9046 is used for adjusting current charging current according to the judged result of judge module.When power information is " limit for height " type power information, if current charging current greater than the charging current limit, is then adjusted the numerical value of current charging current to described current limit, process ends; If current charging current is less than limiting charging current, then: process ends; When power information is " limitting low " type power information, if current charging current is greater than the charging current limit, then: process ends; If current charging current less than limiting charging current, is then adjusted the numerical value of current charging current to described current limit, process ends.
In fact, above-mentioned charging current adjusting module carries out in the current charging current adjustment process, power information is under " limit for height " type power information situation, except that being benchmark dynamically adjust to current charging current to limit charging current with the size that limits charging current according to current charging current according to mode as mentioned above, can also be before dynamically adjusting current charging current, to limit charging current and the preset charged electric current compares, if it is bigger than preset charged electric current to limit charging current, is that benchmark is adjusted current charging current with the preset charged electric current then; If it is littler than preset charged electric current to limit charging current, be that benchmark is adjusted current charging current still then to limit charging current; Similarly, power information is under " limitting low " type power information situation, also can be according to carrying out conversion as upper type to the benchmark that current charging current is dynamically adjusted.The preset charged electric current here defines in such a manner: suppose the electrical network infinity, in the time of need not considering to limit charging current, the actual charge condition of the rechargeable battery of the electric vehicle that the complete foundation of vehicle-mounted charging device is attached thereto charges, and charging current in such cases is defined as the preset charged electric current.
Above-mentioned charging current adjusting module is to regulate size of current by the time scale that power switch high frequency in the fixed cycle of controlling its inner setting turns on and off, the concrete operations flow process is as follows: the service time that increases power switch in the fixed cycle, then the power by this power switch increases, thereby strengthens charging current; In the fixed cycle, reduce the service time of power switch, then pass through the power reduction of this power switch, thereby reduce charging current.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use patent of the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation of the spirit or scope that do not break away from patent of the present invention in other embodiments.Therefore, patent of the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and novel creation characteristics the wideest corresponding to scope.
Claims (13)
1. a charge control method is characterized in that, this method comprises:
Read network load information, and judge whether this network load reaches pre-set threshold value, if then send corresponding early warning signal to the charging master control system;
Described charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table, so that use this charging load overall control information to generate power allocation information, and this power allocation information passed to corresponding charhing unit respectively according to preset rules; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
After described charhing unit receives described power allocation information, this power allocation information is modulated, and the power information after will modulating passes to vehicle-mounted charging device;
Described vehicle-mounted charging device carries out demodulation to the described modulated power information that receives, calculate the qualification charging current according to the power information that demodulates, and judge current charging current and described qualification charging current size, according to the current charging current of the corresponding adjustment of judged result.
2. method according to claim 1 is characterized in that, describedly reads the power distribution network information on load and judges that the step whether this network load reaches pre-set threshold value carries out in real time or periodically.
3. method according to claim 1 is characterized in that, described step according to preset rules generation power allocation information comprises:
Described charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Described charhing unit passes to described vehicle-mounted charging device after the power demand investigation instruction that receives is modulated;
After described vehicle-mounted charging device demodulation obtains described power demand investigation instruction, pass to described charging master control system by described charhing unit after the current charge power information modulation with vehicle-mounted charging device;
After described charging master control system obtains the current charge power information of each vehicle-mounted charging device, according to the ratio generation power allocation information of described charging load overall control information according to each vehicle-mounted charging device current power.
4. method according to claim 1, it is characterized in that, power information after described charhing unit will be modulated passes to before the described vehicle-mounted charging device, described method also comprises: described charhing unit sends the instruction of shaking hands to described vehicle-mounted charging device, the described instruction of shaking hands is used to judge whether vehicle-mounted charging device is in normal operating conditions, if then carry out the step that the power information after transmission is modulated is given described vehicle-mounted charging device; If not, then send the status message of described vehicle-mounted charging device to described charging master control system, described charhing unit was set to not distribute power rating after described charging master control system received this status message, and regenerated power allocation information.
5. according to any one described method in the claim 1 to 4, it is characterized in that the information transmission between described charhing unit and the vehicle-mounted charging device uses charging electric wire or the CAN bus between described charhing unit and the vehicle-mounted charging device to transmit.
6. a charge control system is characterized in that, this system comprises network load judging unit, charging master control system, at least one charhing unit and at least one vehicle-mounted charging device, wherein:
Described network load judging unit is connected with the electrical network of distribution center, is used to read network load information, and judges whether this network load reaches reservation threshold, if then send corresponding early warning signal to described charging master control system;
Described charging master control system is connected with described network load judging unit, be used for obtaining charging load overall control information according to described early warning signal inquiry preset charged load overall control table, so that use this charging load overall control information to generate power allocation information, and this power allocation information passed to corresponding described charhing unit respectively according to preset rules; Described preset charged load overall control table is preserved described early warning signal and charging load overall control information, and described early warning signal is corresponding one by one with charging load overall control information;
Described charhing unit is connected with described charging master control system, be used for the described power allocation information that receives is modulated, and the power information after will modulating passes to described vehicle-mounted charging device;
Described vehicle-mounted charging device is connected with described charhing unit, be used for the described modulated power information that receives is carried out demodulation, calculate the qualification charging current according to the power information that demodulates, and judge current charging current and described qualification charging current size, according to the current charging current of the corresponding adjustment of judged result.
7. system according to claim 6 is characterized in that, described network load judging unit reads network load information in real time or periodically and judges whether this network load reaches pre-set threshold value.
8. system according to claim 6 is characterized in that, described charging master control system comprises according to the step that preset rules generates power allocation information:
Described charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Described charhing unit passes to described vehicle-mounted charging device after the power demand investigation instruction that receives is modulated;
After described vehicle-mounted charging device demodulation obtains described power demand investigation instruction, pass to described charging master control system by described charhing unit after the current charge power information modulation with vehicle-mounted charging device;
After described charging master control system obtains the current charge power message of each vehicle-mounted charging device, according to the ratio generation power allocation information of described charging load overall control information according to the current charge power of each vehicle-mounted charging device.
9. system according to claim 6, it is characterized in that, described charhing unit is used for that also the power information after the modulation is passed to described vehicle-mounted charging device and sends the instruction of shaking hands to described vehicle-mounted charging device before, the described instruction of shaking hands is used to judge whether vehicle-mounted charging device is in normal operating conditions, if then carry out the step that the power information after transmission is modulated is given described vehicle-mounted charging device; If not, then send the status message of described vehicle-mounted charging device to described charging master control system; Then:
Described charging master control system is used for that described charhing unit is set to not distribute power rating after receiving this status message, and regenerates power allocation information.
10. according to any one described system in the claim 6 to 9, it is characterized in that the information transmission between described charhing unit and the vehicle-mounted charging device uses charging electric wire or the CAN bus between described charhing unit and the vehicle-mounted charging device to transmit.
11. system according to claim 6 is characterized in that, described charging master control system comprises query unit, main control unit, memory cell and first communication module, wherein:
Described query unit is used to receive the early warning signal that described network load judging unit sends, and inquires about described preset charged load overall control table acquisition charging load overall control information according to this early warning signal;
Described main control unit is used to use described charging load overall control information to generate power allocation information according to preset rules, and by first communication module this power allocation information is passed to described charhing unit;
Described memory cell is used for storing in advance charging load overall control information.
12. system according to claim 6, it is characterized in that, described charhing unit comprises modulation module, second communication module, wherein: described modulation module is used for the power information of described charging master control system transmission is modulated, and passes to described vehicle-mounted charging device by described second communication module.
13. system according to claim 6 is characterized in that, described vehicle-mounted charging device comprises demodulation module, computing module, judge module, current detection module and charging current adjusting module, wherein:
Described demodulation module is used for the described modulation signal that comprises power information is carried out demodulation, and the power information after the demodulation is passed to computing module;
Described computing module is used for calculating the qualification charging current according to described power information;
Qualification charging current and the detected current charging current of current detection module that described judge module is used for computing module is calculated compare, and trigger the charging current adjusting module;
Described charging current adjusting module is used for according to the current charging current of the corresponding adjustment of judged result.
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