CN102290852B - Charging control method and system - Google Patents
Charging control method and system Download PDFInfo
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- CN102290852B CN102290852B CN201110162581.5A CN201110162581A CN102290852B CN 102290852 B CN102290852 B CN 102290852B CN 201110162581 A CN201110162581 A CN 201110162581A CN 102290852 B CN102290852 B CN 102290852B
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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 in recent years rising, and it,, with energy-conserving and environment-protective, the unique advantage such as easy to use, ambient noise is little, is favored by people extensively.Electric vehicle provides power with electro-motor, and the driving power source of electro-motor is in the inner storage battery discharging and recharging of installing of car body.For strengthening the course continuation mileage of storage battery, the capacity of car battery is generally larger, and normal domestic use power supply, no matter for security consideration or actual power supply capacity, often can not meet charging demand, thereby must build special charging station or charging pile.The attached composition structure chart that Figure 1 shows that a kind of " one drag many " Intelligent charging system.The master control system of this Intelligent charging system drives a plurality of charhing units to charge to the battery of electric motor car; instruction by each communication unit and data interaction have realized drags many scales to expand to charging object one, system simple for structure, construction cost is cheap, extensibility is strong.But, owing to there being a plurality of charging objects simultaneously, the charging demand of each charging object is all larger, and the network load of distribution center is limited in the regular period, if 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, during a large amount of minimizing suddenly of the charging object on Intelligent charging system, power supply level is greater than electricity consumption level, because electric power can not be stored in a large number, the waste of unnecessary electric energy will be caused, for guaranteeing that the steady electricity consumption of Intelligent charging system also must control the charging process of a plurality of charhing units, with the actual load of dynamic adjustments Intelligent charging system ，Shi Qiyu distribution center, adapt.
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 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 so, to charging master control system, send corresponding early warning signal;
Described charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table, to use this charging load overall control information according to preset rules generating power assignment information, and this power allocation information passed to respectively to corresponding charhing unit; 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 receives after described power allocation information, this power allocation information is modulated, and the power information after modulation is passed to vehicle-mounted charging device;
Described vehicle-mounted charging device carries out demodulation to the described modulated power information receiving, according to the power information demodulating, calculate and limit charging current, and judge current charging current and described restriction charging current, according to the current charging current of the corresponding adjustment of judged result.
Preferably, described in, read 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, the described step according to preset rules generating power assignment information comprises:
Described charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Described charhing unit will pass to described vehicle-mounted charging device after the power demand investigation instruction modulation receiving;
Described vehicle-mounted charging device demodulation obtains after described power demand investigation instruction, will after the current charge power information modulation of vehicle-mounted charging device, by described charhing unit, pass to described charging master control system;
Described master control system obtains after the current charge power message of each vehicle-mounted charging device, according to described charging, loads overall control information according to the ratio generating power assignment information of each vehicle-mounted charging device current power.
Preferably, before described charhing unit passes to described vehicle-mounted charging device by the power information after modulation, described method also comprises: described charhing unit sends to described vehicle-mounted charging device the instruction of shaking hands, the described instruction of shaking hands is for judging that whether vehicle-mounted charging device is in normal operating conditions, if so, carry out to transmit power information after modulation to the step of described vehicle-mounted charging device; If not, to described charging master control system, send the status message of described vehicle-mounted charging device, after described charging master control system receives this status message, described charhing unit is set to not distribute power rating, and regenerates power allocation information.
Preferably, the information transmission between described charhing unit and vehicle-mounted charging device is used charging electric wire or CAN bus between described charhing unit and 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, for reading network load information, and judges whether this network load reaches pre-set threshold value, if so, to described charging master control system, sends corresponding early warning signal;
Described charging master control system is connected with described network load judging unit, for obtaining charging load overall control information according to described early warning signal inquiry preset charged load overall control table, to use this charging load overall control information according to preset rules generating power assignment information, and this power allocation information passed to respectively to corresponding described charhing unit; 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, for the described power allocation information receiving is modulated, and the power information after modulation is passed to described vehicle-mounted charging device;
Described vehicle-mounted charging device is connected with described charhing unit, for the described modulated power information receiving is carried out to demodulation, according to the power information demodulating, calculate and limit charging current, and judge current charging current and described restriction charging current, according to the current charging current of the corresponding adjustment of judged result.
Preferably, described network load judging unit reads in real time or periodically network load information and judges whether this network load reaches pre-set threshold value.
Preferably, described charging master control system comprises according to the step of preset rules generating power assignment information:
Described charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Described charhing unit will pass to described vehicle-mounted charging device after the power demand investigation instruction modulation receiving;
Described vehicle-mounted charging device demodulation obtains after described power demand investigation instruction, will after the current charge power information modulation of vehicle-mounted charging device, by described charhing unit, pass to described charging master control system;
Described charging master control system obtains after the current power message of each vehicle-mounted charging device, according to described charging, loads overall control information according to the ratio generating power assignment information of the current charge power of each vehicle-mounted charging device.
Preferably, described charhing unit also sent to described vehicle-mounted charging device the instruction of shaking hands before the power information after modulation is passed to described vehicle-mounted charging device, the described instruction of shaking hands is for judging that whether vehicle-mounted charging device is in normal operating conditions, if so, carry out to transmit power information after modulation to the step of described vehicle-mounted charging device; If not, to described charging master control system, send the status message of described vehicle-mounted charging device; :
Described charging master control system is set to not distribute power rating for described charhing unit after receiving this status message, and regenerates power allocation information.
Preferably, the information transmission between described charhing unit and vehicle-mounted charging device is used charging electric wire or CAN bus between described charhing unit and vehicle-mounted charging device to transmit.
Preferably, described network load judging unit is integrated in described charging master control system.
Preferably, described charging master control system comprises query unit, main control unit, memory cell and the first communication module, wherein:
The early warning signal that described query unit sends for receiving described network load judging unit, and inquire 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 for using described charging load overall control information according to preset rules generating power assignment information, and by the first communication module, this power allocation information is passed to described charhing unit;
Described memory cell is for pre-stored charging load overall control information.
Preferably, described charhing unit comprises modulation module, the second communication module, wherein: described modulation module is used for the power information of described charging master control system transmission to modulate, and passes to described vehicle-mounted charging device by described the 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 to carry out demodulation, and the power information after demodulation is passed to computing module;
Described computing module is for calculating restriction charging current according to described power information;
The current charging current that described judge module detects for restriction charging current that computing module is calculated and current detection module compares, and triggers 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 by the network load of monitoring a plurality of charhing units charging object being carried out to distribution center in charging process, network load situation is reflected to charging master control system, by charging master control system generating power assignment information, and then utilize this power allocation information to make real-time adjustment to the charging current of each charging object, efficiently solve the waste to the impact of electrical network and electric energy that electric motor car may cause when charging station or charging pile charging.
Accompanying drawing explanation
In order to be illustrated more clearly in patent working example of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of patent of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of " one drag many " Intelligent charging system;
Fig. 2 is the flow chart of the embodiment of method of the present invention;
Fig. 3 is the flow chart of another embodiment generating power allocation table step of method of the present invention;
Fig. 4 is the flow chart that another embodiment of method of the present invention sends the instruction step of shaking hands;
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 present invention, the technical scheme of the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
For the purpose of narration various embodiments of the invention are convenient, first by the present invention based on " one drag many " Intelligent charging system simply introduce.The attached structure chart that Figure 1 shows that 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, as background technology part of the present invention is sayed, may there is the situation of unexpected increase or minimizing in the charging object of the charhing unit under this framework, impact 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 littlely, can guarantee again the efficient utilization of electric energy, thereby reduce waste of energy.The method that the embodiment of the present invention provides efficiently solves this problem.
It shown in accompanying drawing 2, is the flow chart of embodiment of the method for the present invention.The method comprises:
Step S201: network load judging unit reads network load information;
Network load judging unit reads network load information, monitoring network load changes for guaranteeing that 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, may there is burning instrument, damage grid equipment, equivalent risk extremely trips, the battery capacity of electric vehicle is huge, once a plurality of rechargeable batteries are charged and will greatly increase above-mentioned risk simultaneously; When electricity consumption level is during significantly lower than power supply capacity, cannot global storage due to electric energy, unnecessary electric energy can not effectively utilize, and causes waste, once a plurality of rechargeable batteries of charging stop charging simultaneously, electricity consumption level will decline rapidly, utilization rate of electrical decreases.
Step S202: judge whether this network load reaches pre-set threshold value, if so, send corresponding early warning signal to charging master control system, enter step S203; If not, return to step S201;
As mentioned above, from power grid security, the angle of efficient operation is considered, charging master control system charges normal in process rechargeable battery by charhing unit, to charhing unit, provide the load level of the electrical network of electric energy can not be too low, must be on default minimum threshold values, can not be too high, must be under the highest pre-set threshold value, even according to actual needs, the pre-set threshold value that can have a plurality of gradients, the corresponding a kind of early warning signal of each threshold values, if network load level reaches some pre-set threshold value, to charging master control system, send corresponding early warning signal, by master control system, regulated the charge condition of a plurality of charhing units, to adapt to the needs of network load stable operation, corresponding relation between early warning signal and pre-set threshold value, can arrange according to the statistics of historical charge condition, arranges after also can taking into full account the actual conditions of rechargeable battery self electric energy number, in practical application, to the battery of the electric vehicle of charging station or charging pile charging some electric energy still, the electric weight needing during charging is less, at this moment can turn down corresponding pre-set threshold value.
Step S203: charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table, to use this charging load overall control information according to preset rules generating power assignment information, and this power allocation information passed to respectively to corresponding charhing unit; 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; When charging master control system receives after early warning signal, inquire about this preset charged load overall control table and obtain corresponding charging load overall control information, this charging load overall control information is the total amount of the charge power of all charhing units of being connected with charging master control system, if early warning signal is " limit for height " type early warning signal, represent that 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 the charge power summation of all charhing units can not be lower than above-mentioned total amount; Charging master control system obtains after charging load overall control information according to this information according to preset rules production power division table, and the power information of distribution is sent to corresponding charhing unit;
Step S204: charhing unit receives after described power information, modulates this power allocation information, and the power information after modulation is passed to vehicle-mounted charging device;
Charhing unit is signal circuit with being connected between master control system of charging, transmission of information easily, but, because the rechargeable battery that need to connect vehicle-mounted charging device charges, what between charhing unit and vehicle-mounted charging device, be connected is charging electric wire, thereby direct transmission information, information must be modulated and form carrier signal, then this carrier signal is transferred to vehicle-mounted charging device by charging electric wire, concrete modulator approach can be frequency modulation(FM), Modulation and Amplitude Modulation, phase-modulation, the mode that above-mentioned use charging electric wire carries out signal transmission is called PLC (Power Line Communication) mode, this directly utilize existing charging electric wire as data communication carrier, can greatly reduce the cost of investment of networking, in fact, except above-mentioned PLC mode, can there is multiple concrete mode to realize communicating by letter between charhing unit and vehicle-mounted charging device, such as adopting CAN bus mode, CAN bus belongs to the category of fieldbus, it is the distributed control of a kind of effective support or the real-time serial communication network of controlling, it is reliable that control system based on CAN bus has transmission, real-time is high, the advantages such as transmission rate is fast, each node of CAN bus equal, be that any one node is as long as outfit CAN bus control unit and driver can communicate with other nodes that are connected in this CAN bus, the charhing unit of native system and vehicle-mounted charging device can be regarded the node in CAN bus network as, all can realize mutual data communication by being equipped with CAN bus control unit and driver, between charhing unit and vehicle-mounted charging device, can also adopt wireless mode to realize and communicate by letter, can be the 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 receiving, calculates charging current limit according to the power information demodulating;
Vehicle-mounted charging device first carries out demodulation and obtains above-mentioned power information for receiving carrier information, then this power information is used to calculate charging current limit, during the calculating of charging current limit, need the numerical value of charging voltage, this charging voltage value can be the value of fixing in advance, can be also the dynamic electric voltage value detecting.Except using charging voltage, calculate charging current limit, also can use additive method, as by the resistance of ohmmeter testing circuit, then utilize physical rules to calculate charging current limit, in a word, embodiments of the invention are not made any particular determination to the concrete grammar calculating.
Step S206: judge current charging current and described restriction charging current, according to the current charging current of the corresponding adjustment of judged result.
As mentioned above, difference due to early warning signal type, power information is corresponding changing also, 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 charging current limit, adjust current charging current to the numerical value of described current limit, process ends; If current charging current is less than restriction charging current: process ends; When power information is " limitting low " type power information, if current charging current is greater than charging current limit: process ends; If current charging current is less than restriction charging current, adjust current charging current to the numerical value of described current limit, process ends.
In fact, in above-mentioned current charging current adjustment process, power information is in " limit for height " type power information situation, except according to according to current charging current and the size that limits charging current, current charging current being take and limited charging current as benchmark is dynamically adjusted as described above, can also be before dynamically adjusting current charging current, restriction charging current and preset charged electric current are compared, if it is larger than preset charged electric current to limit charging current, the preset charged electric current of take is adjusted current charging current as benchmark; If it is less than preset charged electric current to limit charging current, still take and limit charging current and adjust current charging current as benchmark; Similarly, power information is in " limitting low " type power information situation, and the benchmark that current charging current is carried out dynamically adjusting also can be according to converting as upper type.The preset charged electric current here defines in such a manner: suppose that electrical network is infinitely great, while not needing to consider to limit charging current, the actual charge condition of the rechargeable battery of the vehicle-mounted charging device electric vehicle that foundation is attached thereto completely charges, and charging current is in such cases defined as preset charged electric current.
The adjustment of above-mentioned charging current is that the time scale that the high frequency within the fixed cycle turns on and off by power ratio control switch regulates size of current, concrete operations flow process is as follows: the service time that increases power switch within the fixed cycle, pass through the increased power of this power switch, thereby strengthen charging current; Within the fixed cycle, reduce the service time of power switch, by the power reduction of this power switch, thereby reduce charging current.
The present embodiment changes by the network load of monitoring a plurality of charhing units charging object being carried out to distribution center in charging process, network load situation is reflected to charging master control system, by charging master control system generating power assignment information, and then utilize this power allocation information to make real-time adjustment to the charging current of each charging object, efficiently solve that electric motor car may cause when the charging of charging station or charging pile to the impact of electrical network and waste of energy.In addition, the present embodiment is when carrying out the adjustment of current charging current, by considering preset charged electric current and limiting the relation between charging current, current charging current is adjusted to most suitable state, can improve like this useful life of the rechargeable battery of electric vehicle.
In above-described embodiment step S201, read network load information and can carry out as required this action, in fact, the variation of network load situation while 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 to rechargeable battery, realize better charging and control.
The mode of above-described embodiment generating power assignment information can be selected according to actual needs, such as: a plurality of charhing units are numbered with to sequence number, according to sequence number, distribute to regularly a certain proportion of charge power of each charhing unit, while carrying out next time power division, still carry out in this manner.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 preferably considers that 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 so the given gross power of charging load total amount, form thus another embodiment of method of the present invention.Each step of this embodiment except step S203 and above-described embodiment variant, other steps are all identical.Referring to accompanying drawing 3, the S303 step of the present embodiment specifically comprises:
Step S3031: 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: charging master control system is to described each charhing unit transmitted power survey of demands instruction;
Step S3033: charhing unit will pass to vehicle-mounted charging device after the power demand investigation instruction modulation receiving;
Step S3034: described vehicle-mounted charging device demodulation obtains after described power demand investigation instruction, to after the current charge power information modulation of vehicle-mounted charging device, pass to described charhing unit, described charhing unit carries out demodulation to this information, and the current charge power information of the vehicle-mounted charging device after demodulation is passed to described charging master control system;
Step S3035: described master control system obtains after the current charge power message of each vehicle-mounted charging device, loads overall control information according to the ratio generating power assignment information of the current charge power of each vehicle-mounted charging device according to described charging.
This embodiment obtains the actual demand situation of each charhing unit by the mode of " democracy " investigation, can effectively solve technical problem of the present invention, also can adapt to better the needs of practical application.
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 distribute to the power of each charhing unit has surpassed after the maximum permission charge power of this charhing unit according to the above-mentioned method of salary distribution; 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 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:
Network load judging unit receives actual load and is more than or equal to 90% of peak load, sends early warning signal to charging master control system;
Charging master control system is received after early warning signal, first to connected two charhing units, issues power investigation instruction;
Charhing unit passes to respectively own corresponding vehicle-mounted charging device after power is investigated to instruction;
Vehicle-mounted charging device is respectively by the charhing unit of giving of the current charge power passback correspondence of oneself;
First charhing unit is passed to charging master control system by 3 kilowatts of its maximum current power that allows 4 kilowatts of charge powers and coupled vehicle-mounted charging device, and second charhing unit passed to master control system by 4 kilowatts of its maximum current power that allows 5 kilowatts of charge powers and coupled vehicle-mounted charging device;
The current cumulative power of charging master control system is 7 kilowatts, according to early warning signal inquiry preset charged load overall control table, obtaining corresponding charging load overall control information is that master control system power-limiting equals 6 kilowatts, current power ratio according to vehicle-mounted charging device 1 and 2 is carried out power information distribution, and two vehicle-mounted charging devices are distributed to respectively the power of 18/7 kilowatt and 24/7 kilowatt;
Charging master control system is distributed this power information to send to corresponding vehicle-mounted charging device by charhing unit;
Vehicle-mounted charging device carries out the adjustment of current charging current according to power allocation information.
When in above-mentioned two embodiment, charhing unit passes to vehicle-mounted charging device by the power information after modulation, can directly this information be sent to vehicle-mounted charging device, but, because each electric vehicle is all equipped with vehicle-mounted charging device, to the vehicles, charging all will be used this device at every turn, these vehicle-mounted charging devices by frequent and many occasion use, probably damage, if vehicle-mounted charging device damages, the power allocation information being sent by charging master control system can not effectively receive, thereby cause whole control procedure failure, in addition, connecting interface between vehicle-mounted charging device and 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, just sent above-mentioned power allocation information when acknowledgement state is good.Increase above-mentioned shaking hands after instruction step, then form another embodiment of the present invention on aforementioned 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 starts timer after vehicle-mounted charging device sends the instruction of shaking hands, and detect 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 so, enter step S4045; If not, perform step S4043 (a): to described charging master control system, send the status message of described vehicle-mounted charging device, enter step S4044;
Step S4044: after described charging master control system receives described status message, described charhing unit is set to not distribute power rating, and regenerates power allocation information, enters step S403;
Step S4045: the power allocation information that step S4041 is received is modulated, and the power information after modulation is passed to vehicle-mounted charging device.
In above-mentioned steps S4043, if do not receive in the given time the response message of vehicle-mounted charging device, also can abandon this power allocation information, wait for power allocation information next time; Can also pass through trigger alarm system, point out the problem at this place to keeper, keeper places under repair.
Above-mentioned three embodiment that introduced method of the present invention, corresponding with it, the invention provides the system that charging is controlled that realizes.Shown in 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:
The electrical network of network load judging unit 601Yu distribution center connects, and for reading network load information, and judges whether this network load reaches reservation threshold, if so, to described charging master control system, sends corresponding early warning signal;
Charging master control system 602 is connected with network load judging unit 601, for obtaining charging load overall control information according to described early warning signal inquiry preset charged load overall control table, to use this charging load overall control information according to preset rules generating power allocation information table, and this power allocation information passed to respectively to corresponding described charhing unit; 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;
Charhing unit 603 is connected with charging master control system 602, for the described power information receiving is modulated, and the power information after modulation is passed to described vehicle-mounted charging device;
Vehicle-mounted charging device 604 is connected with charhing unit 603, for the described modulated power information receiving is carried out to demodulation, according to the power information demodulating, calculate and limit charging current, and judge current charging current and described restriction charging current, according to the current charging current of the corresponding adjustment of judged result.
The specific works process of the present embodiment, referring to the description to charge control method embodiment above, will not repeat herein.
Native system embodiment monitors by network load judging unit the network load that a plurality of charhing units carry out distribution center in charging process to charging object and changes, network load situation is reflected to charging master control system, by charging master control system generating power assignment information, and then utilize this power allocation information to make real-time adjustment to the charging current of each charging object, efficiently solve the waste to the impact of electrical network and electric energy that electric motor car may cause when charging station or charging pile charging.
Network load judging unit 601 in said system embodiment preferably reads in real time or periodically network load information and judges whether this network load reaches reservation threshold, can monitor more exactly the variation of network load like this, thereby dynamically control charging process.
Network load judging unit 601 in said system embodiment can be used as independently parts and is arranged at outside charging master control system, also can be integrated in charging master control system inner.
The concrete composition structure of the charging master control system in said system embodiment can be used any version that can complete its function in prior art, and the structure shown in also can preferred figures 7 forms.This charging master control system 702 comprises query unit 7021, main control unit 7022, memory cell 7023 and the first communication module 7024, wherein:
The early warning signal that query unit 7021 sends for receiving network load judging unit 701, and inquire about described preset charged load overall control table acquisition charging load overall control information according to this early warning signal;
The concrete composition structure of the charhing unit in said system embodiment can be used any version that can complete its function in prior art, and the structure shown in also can preferred figures 8 forms.This charhing unit 803 comprises modulation module 8031, the second communication module 8032, wherein: modulation module 8031 is modulated to carrier signal for the power information that charging master control system 802 is transmitted, and passes to described vehicle-mounted charging device by the second communication module 8032.
The concrete composition structure of the vehicle-mounted charging device in said system embodiment can be used any version that can complete its function in prior art, and the structure shown in also can preferred figures 9 forms.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:
Charging current adjusting module 9046 is 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 is greater than charging current limit, adjust current charging current to the numerical value of described current limit, process ends; If current charging current is less than restriction charging current: process ends; When power information is " limitting low " type power information, if current charging current is greater than charging current limit: process ends; If current charging current is less than restriction charging current, adjust current charging current to the numerical value of described current limit, process ends.
In fact, above-mentioned charging current adjusting module carries out in current charging current adjustment process, power information is in " limit for height " type power information situation, except according to according to current charging current and the size that limits charging current, current charging current being take and limited charging current as benchmark is dynamically adjusted as described above, can also be before dynamically adjusting current charging current, restriction charging current and preset charged electric current are compared, if it is larger than preset charged electric current to limit charging current, the preset charged electric current of take is adjusted current charging current as benchmark; If it is less than preset charged electric current to limit charging current, still take and limit charging current and adjust current charging current as benchmark; Similarly, power information is in " limitting low " type power information situation, and the benchmark that current charging current is carried out dynamically adjusting also can be according to converting as upper type.The preset charged electric current here defines in such a manner: suppose that electrical network is infinitely great, while not needing to consider to limit charging current, the actual charge condition of the rechargeable battery of the vehicle-mounted charging device electric vehicle that foundation is attached thereto completely charges, and charging current is in such cases defined as preset charged electric current.
Above-mentioned charging current adjusting module is to regulate size of current by controlling the time scale that the high frequency of its inner power switch arranging within the fixed cycle turn on and off, concrete operations flow process is as follows: the service time that increases power switch within the fixed cycle, pass through the increased power of this power switch, thereby strengthen charging current; Within the fixed cycle, reduce the service time of power switch, by the power reduction of this power switch, thereby reduce charging current.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in 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 technical field.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use patent of the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can be in the situation that do not depart from the spirit or scope of patent of the present invention, realization in other embodiments.Therefore, patent of the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and novel creation feature.
Claims (12)
1. a charge control method, is characterized in that, the method comprises:
Read network load information, and judge whether network load reaches pre-set threshold value, if so, to charging master control system, send corresponding early warning signal;
Described charging master control system obtains charging load overall control information according to described early warning signal inquiry preset charged load overall control table, to use this charging load overall control information according to preset rules generating power assignment information, and this power allocation information passed to respectively to corresponding charhing unit; 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 receives after described power allocation information, this power allocation information is modulated, and the power information after modulation is passed to vehicle-mounted charging device;
The power information of described vehicle-mounted charging device after to the described modulation receiving carried out demodulation, according to the power information demodulating, calculate and limit charging current, and judge current charging current and described restriction charging current, according to the current charging current of the corresponding adjustment of judged result.
2. method according to claim 1, is characterized in that, described in read power distribution network information on load and judge that the step whether network load reaches pre-set threshold value carries out in real time or periodically.
3. method according to claim 1, is characterized in that, the described step according to preset rules generating power assignment information comprises:
Described charging master control system is to each charhing unit transmitted power survey of demands instruction;
Described charhing unit will pass to described vehicle-mounted charging device after the power demand investigation instruction modulation receiving;
Described vehicle-mounted charging device demodulation obtains after described power demand investigation instruction, will after the current charge power information modulation of vehicle-mounted charging device, by described charhing unit, pass to described charging master control system;
Described charging master control system obtains after the current charge power information of each vehicle-mounted charging device, according to described charging, loads overall control information according to the ratio generating power assignment information of the current charge power of each vehicle-mounted charging device.
4. method according to claim 1, it is characterized in that, before described charhing unit passes to described vehicle-mounted charging device by the power information after modulation, described method also comprises: described charhing unit sends to described vehicle-mounted charging device the instruction of shaking hands, the described instruction of shaking hands is for judging that whether vehicle-mounted charging device is in normal operating conditions, if so, carry out to transmit power information after modulation to the step of described vehicle-mounted charging device; If not, to described charging master control system, send the status message of described vehicle-mounted charging device, after described charging master control system receives this status message, described charhing unit is set to not distribute power rating, and regenerates power allocation information.
5. according to the method described in any one in claim 1 to 4, it is characterized in that, the information transmission between described charhing unit and vehicle-mounted charging device is used charging electric wire or the CAN bus between described charhing unit and 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, for reading network load information, and judges whether network load reaches reservation threshold, if so, to described charging master control system, sends corresponding early warning signal;
Described charging master control system is connected with described network load judging unit, for obtaining charging load overall control information according to described early warning signal inquiry preset charged load overall control table, to use this charging load overall control information according to preset rules generating power assignment information, and this power allocation information passed to respectively to corresponding described charhing unit; 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; The described step according to preset rules generating power assignment information comprises: described charging master control system is to each charhing unit transmitted power survey of demands instruction; Described charhing unit will pass to described vehicle-mounted charging device after the power demand investigation instruction modulation receiving; Described vehicle-mounted charging device demodulation obtains after described power demand investigation instruction, will after the current charge power information modulation of vehicle-mounted charging device, by described charhing unit, pass to described charging master control system; Described charging master control system obtains after the current charge power message of each vehicle-mounted charging device, according to described charging, loads overall control information according to the ratio generating power assignment information of the current charge power of each vehicle-mounted charging device;
Described charhing unit is connected with described charging master control system, for the described power allocation information receiving is modulated, and the power information after modulation is passed to described vehicle-mounted charging device;
Described vehicle-mounted charging device is connected with described charhing unit, for the power information after the described modulation receiving is carried out to demodulation, according to the power information demodulating, calculate and limit charging current, and judge current charging current and described restriction charging current, 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 in real time or periodically network load information and judges whether network load reaches pre-set threshold value.
8. system according to claim 6, it is characterized in that, described charhing unit also sent to described vehicle-mounted charging device the instruction of shaking hands before the power information after modulation is passed to described vehicle-mounted charging device, the described instruction of shaking hands is for judging that whether vehicle-mounted charging device is in normal operating conditions, if so, carry out to transmit power information after modulation to the step of described vehicle-mounted charging device; If not, to described charging master control system, send the status message of described vehicle-mounted charging device; :
Described charging master control system is set to not distribute power rating for described charhing unit after receiving this status message, and regenerates power allocation information.
9. according to the system described in any one in claim 6 to 8, it is characterized in that, the information transmission between described charhing unit and vehicle-mounted charging device is used charging electric wire or the CAN bus between described charhing unit and vehicle-mounted charging device to transmit.
10. system according to claim 6, is characterized in that, described charging master control system comprises query unit, main control unit, memory cell and the first communication module, wherein:
The early warning signal that described query unit sends for receiving described network load judging unit, and inquire 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 for using described charging load overall control information according to preset rules generating power assignment information, and by the first communication module, this power allocation information is passed to described charhing unit;
Described memory cell is for pre-stored charging load overall control information.
11. systems according to claim 6, it is characterized in that, described charhing unit comprises modulation module, the second communication module, wherein: described modulation module is used for the power information of described charging master control system transmission to modulate, and passes to described vehicle-mounted charging device by described the second communication module.
12. systems 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 modulation signal that comprises power information to carry out demodulation, and the power information after demodulation is passed to computing module;
Described computing module is for calculating restriction charging current according to the power information demodulating;
The current charging current that described judge module detects for restriction charging current that computing module is calculated and current detection module compares, and triggers 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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