CN110001430B - Electric automobile double-gun direct current charging control system and control method - Google Patents
Electric automobile double-gun direct current charging control system and control method Download PDFInfo
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- CN110001430B CN110001430B CN201910372057.7A CN201910372057A CN110001430B CN 110001430 B CN110001430 B CN 110001430B CN 201910372057 A CN201910372057 A CN 201910372057A CN 110001430 B CN110001430 B CN 110001430B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- Y02T10/00—Road transport of goods or passengers
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Abstract
The invention discloses a double-gun direct current charging control system and a control method for an electric vehicle, wherein the system comprises: the charging system is characterized in that a first direct-current charging socket is arranged on a vehicle, a second direct-current charging socket is also arranged on the vehicle, two charging guns are correspondingly connected during charging respectively, and each charging gun performs charging output control through a corresponding charging pile; the vehicle-mounted BMS is connected with the charging pile corresponding to each charging gun in a communication mode, and the first direct-current charging socket and the second direct-current charging socket are connected with the vehicle-mounted storage battery through the high-voltage relay K6 and the high-voltage relay K7 respectively. The invention has the advantages that: charge to the car through two charging robbers, accomplish the quick purpose of being full of the battery, improved charge efficiency, reduce the charge time.
Description
Technical Field
The invention relates to the field of automobile charging, in particular to a double-gun direct-current charging control system and a charging control method.
Background
Along with the increase of the market demand for the long-endurance function of the electric automobile, the energy of the battery system is also greatly improved. On the premise that a voltage platform of the electric automobile is certain, even if the direct current charging current is increased within the allowable range of the power battery, the maximum output current of a single direct current charging pile is limited (generally not exceeding 120A), and the charging time of single-gun direct current charging still cannot meet the daily needs of customers.
In addition, for an electric vehicle having a low-voltage platform system (generally 100V to 200V, where low voltage is relative to a high-voltage platform of 300V or more), it is also imperative to increase a dc charging current to shorten a charging time, when the energy of a power battery is constant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-gun direct-current charging control system and a double-gun direct-current charging control method for an electric vehicle, which are used for charging the vehicle by adopting double guns and controlling charging.
In order to achieve the purpose, the invention adopts the technical scheme that: a double-gun direct-current charging control system of an electric automobile is characterized in that a first direct-current charging socket is arranged on the automobile, a second direct-current charging socket is also arranged on the automobile, two charging guns are correspondingly connected during charging respectively, and each charging gun performs charging output control through the corresponding charging pile; the vehicle-mounted BMS is connected with the charging pile corresponding to each charging gun in a communication mode, and the first direct-current charging socket and the second direct-current charging socket are connected with the vehicle-mounted storage battery through the high-voltage relay K6 and the high-voltage relay K7 respectively.
BMS includes main control chip, charging connection detection circuit, utmost point post temperature sampling detection circuit, CAN communication circuit, high-voltage relay control circuit.
And the BMS is integrated with a bus current detection circuit for detecting current data on a charging bus of the vehicle-mounted storage battery.
A double-gun DC charging control method for an electric automobile is characterized in that two DC charging plug seats corresponding to charging guns are arranged on the automobile and used for charging a vehicle-mounted storage battery through the two charging guns through the DC charging plug seats respectively, and the charging control method comprises the following steps:
a charging preparation step: the preparation before charging is completed through the step, and the charging condition is met;
a charging power distribution step: the output power of the two charging guns is distributed respectively so as to meet the charging requirement of the storage battery;
a charging step: and the charging pile respectively controls the charging gun to output and charge according to the distributed power.
The charging preparation step includes the following steps:
step1 physical connection and Low Voltage auxiliary Power on
After the physical connection between the vehicle and the direct current charging pile is completed, the direct current charging pile can perform connection confirmation and locking action of the electronic lock, and provides a low-voltage auxiliary power supply for a vehicle charging controller BMS, and the BMS enters an awakening state under the action of the power supply;
step2 handshake message interaction
The BMS can detect the direct current charging connection signal in real time after being awakened, performs connection confirmation, and performs handshake message interaction with the direct current charging pile 1 or 2, and confirms the highest allowable voltage of the vehicle power battery and the version of the used direct current charging protocol in the process;
step 3: insulation detection and handshake identification of pile end
If the interaction of the handshaking messages is normal, the direct current charging pile 1 or 2 respectively carries out insulation detection on the pile end, if the insulation detection is normal, the step of handshaking identification is carried out, the BMS sends the handshaking identification messages, and if the information can be normally identified by the direct current pile 1 or 2, the step of charging parameter configuration is carried out;
step4, charging parameter configuration:
the method comprises the steps that vehicle charging protection setting and direct current charging pile output capacity setting are included, and in a charging parameter configuration stage, a BMS sends a charging parameter message BCP which comprises the highest monomer voltage, the highest total voltage, the highest current, the highest temperature allowed by a battery, the SOC of a current power battery and the current total voltage; the direct current charging pile 1 or 2 can send respective output capacity range including highest and lowest output voltage and highest and lowest output current at fixed time. Then both sides enter a ready preparation stage;
step5 Ready to Charge
Including the insulating detection of vehicle side, high voltage relay control and direct current fill electric pile outside voltage detection and adjustment, BMS can decide the direct current that the control corresponds according to the connection signal that charges and charge high voltage relay and open the diagnosis relevant with this relay, open the insulating detection function of vehicle side simultaneously, if insulating detection is normal, BMS can send the ready message, direct current fills electric pile 1 or 2 and can detect whether its high voltage outside voltage is normal after receiving the ready message, if normal then closed direct current fills the high voltage relay of electric pile side and send direct current and fill electric pile ready message.
At Step2, once the dc charging connection signal is detected, the BMS reports to the vehicle controller that the vehicle is prohibited from entering a driving state.
In the power distribution stage, the BMS needs to charge the connection condition of the pile and the power battery according to the direct currentCurrent required for charging IneedThe maximum output capacity and the bus current condition of each direct current charging pile are used for carrying out self-adaptive request of charging power, the charging state of the vehicle power battery is monitored in real time in the whole charging process, and the direct current charging piles 1 or 2 can adjust output in real time according to the charging state parameters requested by the BMS and monitor the state of the charging process.
BMS can periodic scan the direct current connection signal that charges to it confirms earlier the stake priority setting of charging that connects the moment for the first time to be higher than another and fills the stake, and at the stage of charging, to the direct current that the charging power request priority is low fill the stake, BMS need do the wait-for-treatment when carrying out the charging power request to it, only when detecting that the generating line has the electric current, just sends the charging power request to it.
For the direct current charging pile with high charging power request priority, the BMS requests the current requested by the direct current charging pile according to the charging current actually required by the power battery;
and for the direct current charging pile j (j is 1 and 2) with low charging power request priority, the BMS requests the direct current charging pile for the requested current according to the difference between the charging current actually required by the power battery and the bus current.
The invention has the advantages that: the two charging snatches charge the automobile, so that the aim of quickly filling the storage battery is fulfilled, the charging efficiency is improved, and the charging time is shortened; simultaneously, the output current of each charging gun is adjusted by controlling the output power of the charging guns corresponding to the two charging piles, so that the maximum charging current requirement required by the power battery is met, and the requirement of charging safety is met while the fastest charging purpose is met.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic view of a DC charging socket interface according to the present invention;
fig. 2 is a schematic diagram of a detection circuit of the BMS during charging according to the present invention;
FIG. 3 is a schematic diagram of a current charging control loop in the battery system according to the present invention;
FIG. 4 is a flow chart of power allocation according to the present invention;
fig. 5 is a simplified power allocation flow diagram according to the present invention.
The labels in the above figures are: 1. s + dc charging communication line CAB _ H; 2. s-dc charging communication line CAB _ L; 3. a + low voltage auxiliary power supply is positive; 4. a-low voltage auxiliary power supply is negative; 5. CC1 charging connection confirmation (dc charging stub); 6. CC2 charge connection confirmation (vehicle side); 7. PE protection is grounded; 21. a temperature sampling detection circuit; 22. a DC charging connection detection circuit; 23. a direct current charging high voltage control relay; 24. a direct current charging communication circuit; 31. the direct current charging loop shares a relay; 32. a direct current charging loop high-voltage relay K7; 33. a direct current charging loop high-voltage relay K6; 34. a dc charging pile FCM 2; 35. the dc charging post FCM 1.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The invention adopts two charging guns to charge the automobile storage battery, thereby improving the charging speed of the whole automobile. Corresponding hardware improvements that need to be made include: increase the charging seat the same all the way on original electric automobile basis, make things convenient for charging of second rifle that charges, the inside circuit of corresponding BMS multiplicable be the same monitoring circuit with original charging seat monitoring circuit all the way and monitor newly-increased seat of inserting, BMS monitors the seat of inserting of two ways respectively and the corresponding with each rifle that charges fill electric pile communication control.
As shown in fig. 1-3, two direct current charging plug sockets are arranged on the electric vehicle, each plug socket corresponds to one charging gun (charging pile), the two plug sockets are consistent in function and circuit structure and are the same as the conventional plug socket, and one plug socket is added on the basis of the original electric vehicle, so that the electric vehicle is provided with two plug sockets to be connected with batteries of the electric vehicle, and the double guns are conveniently used for charging.
During charging, each charging gun performs charging output control through the corresponding charging pile, and each charging gun is correspondingly connected with one direct-current charging socket; on-vehicle BMS charges the electric pile that the rifle corresponds with each and is connected with the communication between the electric pile, and two electric sockets that charge are connected with on-vehicle battery through high voltage relay K6, high voltage relay K7 respectively. BMS is used for the charging process respectively to detect and carries out communication data interaction with filling electric pile, and it includes two ways communication detection loop that correspond respectively, including main control chip and two ways detection and communication circuit, detects and communication circuit and includes charging connection detection circuitry, utmost point post temperature sampling detection circuitry, CAN communication circuit, high-voltage relay control circuit. And the BMS is integrated with a bus current detection circuit for detecting current data on a charging bus of the vehicle-mounted storage battery.
As shown in fig. 1 and 2, a schematic diagram of a dc charging socket corresponding to a charging gun and a schematic diagram of an internal circuit of a BMS are shown, wherein the socket includes an S + dc charging communication line CAB _ H; s-dc charging communication line CAB _ L; a + low voltage auxiliary power supply is positive; a-low voltage auxiliary power supply is negative; CC1 charging connection confirmation (dc charging stub); CC2 charge connection confirmation (vehicle side); PE protection is grounded; can know by the figure, can realize the communication that fills electric pile that corresponds with the rifle that charges through the communication interface that corresponds on this electricity plug seat to realize that low voltage auxiliary power source provides BMS power supply and earth protection etc. and two electricity plug seats that charge that set up on the car are the same circuit principle.
As shown in fig. 2, a temperature sampling detection circuit is provided in the BMS; according to the requirements of national standard GB/T18487-2015, a temperature monitoring device needs to be added in the direct current charging port assembly, and a temperature sampling detection circuit needs to be added in a corresponding BMS hardware circuit; a direct current charging connection detection circuit for confirming a charging connection (CC2 signal) of the vehicle end in cooperation with a newly added direct current charging port; a direct current charging high voltage control relay; for control of the dc charging loop. A direct current charging communication circuit; the communication between the vehicle end and the direct current charging pile is used.
As shown in fig. 3, which is a schematic circuit diagram of the interior of the battery system, the charging piles FCM2 and FCM1 are connected to the plug sockets on the vehicle through respective charging guns, and the two plug sockets are respectively connected to the two ends of the battery through two high-voltage relays K6 and K7.
In order to realize the power distribution of charging the battery by two charging piles in the charging process and the charging process control, the method comprises the following steps
Step1 physical connection and Low Voltage auxiliary Power on
After the physical connection between the vehicle and the dc charging post is completed, the dc charging post performs connection confirmation and locking action of the electronic lock, and provides low-voltage auxiliary power supplies (a + and a in fig. 1) to a vehicle charging controller (usually implemented by a battery management system BMS), and the BMS enters an awake state under the action of the power supplies.
Step2 handshake message interaction
BMS can real-time detection direct current charge connection signal after awakening
Once the direct current charging connection signal is detected, the direct current charging connection signal is reported to the vehicle controller to prohibit the vehicle from entering a running state. And meanwhile, connection confirmation is carried out, handshake message interaction is carried out with the direct current charging pile 1 or 2, and the highest allowable voltage of the vehicle power battery and the version of the used direct current charging protocol are confirmed in the process.
Step 3: insulation detection and handshake identification of pile end
If the handshake messages are normal in interaction, the direct current charging pile 1 or the direct current charging pile 2 respectively conducts insulation detection on the pile end, and if the insulation detection is normal, a handshake identification stage is started. The BMS sends a handshake identification message, and if the information can be normally identified by the direct current piles 1 or 2, the charging parameter configuration stage is started.
Step4 charging parameter configuration (vehicle charging protection setting and DC charging pile output capacity setting)
In the charging parameter configuration stage, the BMS sends a charging parameter message BCP, which comprises the highest cell voltage, the highest total voltage, the maximum current, the highest temperature, the SOC of the current power battery and the current total voltage allowed by the battery. The direct current charging pile 1 or 2 can send respective output capacity range including highest and lowest output voltage and highest and lowest output current at fixed time. The parties then enter the ready phase.
Step5 ready for charging (vehicle side insulation detection, high voltage relay control and DC charging pile outside voltage detection and adjustment)
The BMS determines which circuit of the dc charging high voltage relay (e.g., K6 or K7 in fig. 3) to control based on the charging connection signal and turns on a diagnosis related to the relay, and also turns on an insulation detection function on the vehicle side, and if the insulation detection is normal, the BMS sends a ready message BRO (0 xAA). After receiving the BRO (0xAA), the dc charging pile 1 or 2 detects whether the high-voltage outside voltage is normal, and if so, closes the high-voltage relay on the dc charging pile side and sends a dc charging pile readiness message CRO (0 xAA). And the charging phase is entered after the parameter configuration phase is finished.
Step6 charging phase
In the charging stage, the BMS needs to charge the connection condition of the pile according to the direct current
Charging demand current I of power batteryneedMaximum output capacity I of each direct current charging pilemaxoutj(j-1, 2), bus current IlinkThe situation makes an adaptive request for charging power (current) and monitors the charging state of the vehicle power battery in real time during the whole charging process. And the direct current charging pile 1 or 2 can adjust and output in real time according to the charging state parameters requested by the BMS, and performs state monitoring on the charging process.
BMS requires the addition of detection circuits for the relevant hardware signals: the charging connection detection circuit comprises a charging connection detection circuit of a direct-current charging port, a pole temperature sampling detection circuit of the direct-current charging port, a CAN communication circuit of the direct-current charging port and a high-voltage relay control circuit of the direct-current charging port. (in the direct current charging process, the two direct current charging processes are independent based on the independent communication control processes, and the bus current sampling circuits in the BMS are used for respectively sampling the two bus currents).
1、IneedA charging current (A) representing the actual demand of the vehicle power battery;
2、Imaxoutj(j ═ 1,2) represents the maximum output of the dc charging post 1 or 2A current (A);
3、Ireqj(j ═ 1,2) represents a charging current (a) requested by the vehicle to the dc charging post 1 or 2;
4、Ilinkrepresents the direct current bus current (A);
5、
a charging connection signal of the direct current charging pile 1 or 2 for vehicle end detection is shown;
6. ticj (j ═ 1,2) represents the time when the dc charging pile 1 or 2 first confirms connection;
7. FlagPrij (j ═ 1,2) indicates the priority of the BMS for making a charging power request to the dc charging post 1 or 2;
during Step6 charging, the power allocation and monitoring are as follows:
through setting up the priority of charging power request, can accomplish to avoid because of the electric current of direct current stake 1 not yet having time to export, BMS has begun to fill electric pile 2 to direct current and carries out the charging current request, and produces the overcurrent. For example, the two piles charge the vehicle synchronously, and when the BMS completes the charging current request I of the DC charging pile 1, assuming that the communication interaction between the DC charging pile 2 and the BMS is slightly later than that of the DC charging pile 1req1＝IneedAnd the direct current charging pile 1 does not have current output, the BMS requests the direct current charging pile 2 for charging current, and the vehicle end can not detect the direct current bus current and still requests I according to the current of the actual demandreq2＝IneedInstead of Ireq2＝Ineed-Ilink. At this time, if there is Ineed<(Imaxout1+Imaxout2) The charging current of the power battery is easy to overflow.
By adding detection and control of related signals on a BMS hardware circuit and combining the specific charging power self-adaptive distribution method, the direct-current charging speed of the vehicle can be greatly improved, and the required charging time is further shortened.
One, because of two ways fill communication mutually independently soon, for avoiding charging power request process to appear the possibility of overflowing, need to fill electric pile to two direct currents of access and do priority setting, go on according to who connects earlier who is preferential rule, and concrete way does:
the BMS will periodically scan the DC charging connection signal
Or
And the connection time of the BMS is respectively marked as Tic1 and Tic2 when the BMS confirms connection for the first time, and the priority level flag bits of the charging power requests of the direct current charging piles 1 and 2 are respectively marked as FlagPri1 and FlagPri 2. If Tic1 is less than Tic2, the priority of the BMS for communication and charging with the dc charging post 1 is highest, flag pri1 is 1, and flag pri2 is 0; on the contrary, if Tic1 > Tic2 indicates that the priority of the communication and charging requirements of the BMS with the dc charging post 2 is the highest, flag pri1 is 0, and flag pri2 is 1;
in the charging phase, for the dc charging pile with a low priority of the charging power request (flag prij (j is 1,2 is 0)), the BMS needs to wait for the charging power request, that is, wait for the end only when the bus current is detected. For a dc charging pile with a high priority of charging power request (flag prij (j is 1,2 is 1)), the BMS does not need to wait for a charging power request when the BMS requests the dc charging pile.
Secondly, the BMS can be awakened according to the bus current IlinkAnd the charging current I required by the vehicleneedCharging power (current) I for different DC charging pilesreqjAnd (j ═ 1,2), and the adjusting process (shown in a flow chart in fig. 4) is as follows:
first, for a dc charging pile j (j is 1,2) having a high priority (FlagPrij is 1) of the charging power request, the charging current I actually required by the vehicle is determinedneedMaximum current I which can be output by charging pile and is greater than direct currentmaxoutj(j ═ 1,2), the corresponding request current Ireqj(j-1, 2) can be according to ImaxoutjMaking a request;
② for the dc charging pile j (j is 1,2) having a high priority (flag prij is 1) of the charging power request, the charging current actually required by the vehicle is calculatedIneedNot more than the maximum current I which can be output by the DC pilemaxoutj(j ═ 1,2), the corresponding request current Ireqj(j-1, 2) can be according to IneedMaking a request;
(iii) for the dc charging pile j (j is 1,2) whose charging power request priority is low (FlagPrij is 0), if (I)need-Ilink)＞Imaxoutj(j ═ 1,2), the corresponding request current Ireqj(j-1, 2) can be according to Imaxoutj(j ═ 1,2) make the request;
(j is 1,2) for the dc charging pile j whose charging power request priority is low (FlagPrij is 0), and if (I)need-Ilink)≤Imaxoutj(j ═ 1,2), the corresponding request current Ireqj(j-1, 2) can be as in (I)need-Ilink) A request is made.
Taking into account that even if the current requested by the vehicle exceeds the maximum output capacity of the DC charging post, i.e. Ireqj>Imaxoutj(j ═ 1,2), the charging pile will only output according to its maximum output capacity, I in conditions (r) and (c) can be usedmaxoutj(j-1, 2) each with IneedAnd (I)need-Ilink) Instead. Therefore, the conditions (i) and (ii) can be combined, and the conditions (iii) and (iv) can be combined in the same way. The combined charging power adaptive adjustment process (shown in the flow chart in fig. 5) is as follows:
first, for a dc charging pile j (j is 1,2) having a high priority of charging power request (FlagPrij is 1), the BMS requests a current I from the dc charging pilereqj(j-1, 2) can be according to IneedMaking a request;
② for the dc charging pile j (j is 1,2) having a low priority of charging power request (FlagPrij is 0), the BMS requests the current I of the dc charging pilereqj(j-1, 2) can be as in (I)need-Ilink) A request is made.
In summary, the BMS determines the priority of the charging power request according to the sequence of the charging connections, and determines the priority of the dc charging pile according to IneedMaking charging power request, and according to (I) for DC charging pile with low priorityneed-Ilink) To carry outA charging power request.
This application is through increasing the electricity of charging socket all the way on current electric motor car, make electric motor car can adopt two ways rifle that charge to charge, in order to improve charge efficiency, the electricity of inserting of the same way of increase is the same with the electricity of inserting of prior art, its control is unanimous with the original electricity of inserting of prior art with communication, like this because set up two electricity of inserting seats on the car, realize two electric pile and charge for the battery, for the control of power, prevent charging error, distribute two output power that the electric pile that charges that electricity of inserting the seat corresponds through BMS monitored data back, avoid because the charging power who introduces two ways and charge and cause is greater than the condition that the battery allows, through this kind of mode and corresponding control, can effectively shorten charge time.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (8)
1. A double-gun direct current charging control method for an electric vehicle is characterized by comprising the following steps: the vehicle is provided with two direct current charging plug seats corresponding to the charging guns and used for charging the vehicle-mounted storage battery through the two charging guns through the direct current charging plug seats respectively, and the charging control method comprises the following steps:
a charging preparation step: the preparation before charging is completed through the step, and the charging condition is met;
a charging power distribution step: the output power of the two charging guns is distributed respectively so as to meet the charging requirement of the storage battery;
a charging step: the charging piles respectively control the charging guns to carry out output charging according to the distributed power;
the charging preparation step includes the following steps:
step1 physical connection and Low Voltage auxiliary Power on
After the physical connection between the vehicle and the direct current charging pile is completed, the direct current charging pile can perform connection confirmation and locking action of the electronic lock, and provides a low-voltage auxiliary power supply for a vehicle charging controller BMS, and the BMS enters an awakening state under the action of the power supply;
step2 handshake message interaction
The BMS can detect the direct current charging connection signal in real time after being awakened, performs connection confirmation, and performs handshake message interaction with the direct current charging pile 1 or 2, and confirms the highest allowable voltage of the vehicle power battery and the version of the used direct current charging protocol in the process;
step 3: insulation detection and handshake identification of pile end
If the interaction of the handshaking messages is normal, the direct current charging pile 1 or 2 respectively carries out insulation detection on the pile end, if the insulation detection is normal, the step of handshaking identification is carried out, the BMS sends the handshaking identification messages, and if the information can be normally identified by the direct current pile 1 or 2, the step of charging parameter configuration is carried out;
step4, charging parameter configuration:
the method comprises the steps that vehicle charging protection setting and direct current charging pile output capacity setting are included, and in a charging parameter configuration stage, a BMS sends a charging parameter message BCP which comprises the highest monomer voltage, the highest total voltage, the highest current, the highest temperature allowed by a battery, the SOC of a current power battery and the current total voltage; the direct current charging pile 1 or 2 sends respective output capacity ranges including highest and lowest output voltage and highest and lowest output current at fixed time, and then the two sides enter a ready stage;
step5 Ready to Charge
Including the insulating detection of vehicle side, high voltage relay control and direct current fill electric pile outside voltage detection and adjustment, BMS can decide the direct current that the control corresponds according to the connection signal that charges and charge high voltage relay and open the diagnosis relevant with this relay, open the insulating detection function of vehicle side simultaneously, if insulating detection is normal, BMS can send the ready message, direct current fills electric pile 1 or 2 and can detect whether its high voltage outside voltage is normal after receiving the ready message, if normal then closed direct current fills the high voltage relay of electric pile side and send direct current and fill electric pile ready message.
2. The electric vehicle double-gun direct current charging control method according to claim 1, characterized in that: at Step2, once the dc charging connection signal is detected, the BMS reports to the vehicle controller that the vehicle is prohibited from entering a driving state.
3. The electric vehicle double-gun direct current charging control method according to claim 1 or 2, characterized in that: in the power distribution stage, the BMS needs to charge the required charging current I of the power battery according to the connection condition of the direct current charging pileneedThe maximum output capacity and the bus current condition of each direct current charging pile are used for carrying out self-adaptive request of charging power, the charging state of the vehicle power battery is monitored in real time in the whole charging process, and the direct current charging piles 1 or 2 can adjust output in real time according to the charging state parameters requested by the BMS and monitor the state of the charging process.
4. The electric vehicle double-gun direct current charging control method according to claim 3, characterized in that: BMS can periodic scan the direct current connection signal that charges to it confirms earlier the stake priority setting of charging that connects the moment for the first time to be higher than another and fills the stake, and at the stage of charging, to the direct current that the charging power request priority is low fill the stake, BMS need do the wait-for-treatment when carrying out the charging power request to it, only when detecting that the generating line has the electric current, just sends the charging power request to it.
5. The electric vehicle double-gun direct current charging control method according to claim 4, characterized in that: for the direct current charging pile with high charging power request priority, the BMS requests the current requested by the direct current charging pile according to the charging current actually required by the power battery;
and for the direct current charging pile with low charging power request priority, the BMS requests the request current of the direct current charging pile according to the difference between the charging current actually required by the power battery and the bus current.
6. An electric vehicle double-gun direct current charging control system for operating the electric vehicle double-gun direct current charging control method according to any one of claims 1 to 5, characterized in that: the charging system is characterized in that a first direct-current charging socket is arranged on a vehicle, a second direct-current charging socket is also arranged on the vehicle, two charging guns are correspondingly connected during charging respectively, and each charging gun performs charging output control through a corresponding charging pile; the vehicle-mounted BMS is connected with the charging pile corresponding to each charging gun in a communication mode, and the first direct-current charging socket and the second direct-current charging socket are connected with the vehicle-mounted storage battery through the high-voltage relay K6 and the high-voltage relay K7 respectively.
7. The electric vehicle double-gun direct-current charging control system according to claim 6, characterized in that: BMS includes main control chip, charging connection detection circuit, utmost point post temperature sampling detection circuit, CAN communication circuit, high-voltage relay control circuit.
8. The electric vehicle double-gun direct-current charging control system as claimed in claim 6 or 7, characterized in that: and the BMS is integrated with a bus current detection circuit for detecting current data on a charging bus of the vehicle-mounted storage battery.
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