CN112224087B - Vehicle and charging method and device thereof - Google Patents
Vehicle and charging method and device thereof Download PDFInfo
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- CN112224087B CN112224087B CN201910582153.4A CN201910582153A CN112224087B CN 112224087 B CN112224087 B CN 112224087B CN 201910582153 A CN201910582153 A CN 201910582153A CN 112224087 B CN112224087 B CN 112224087B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention discloses a vehicle and a charging method and device thereof, and belongs to the field of vehicles. The vehicle charging method is applied to a vehicle comprising a charging port and a battery, wherein the vehicle comprises a first energy conversion device and a second energy conversion device which are arranged between the charging port and the battery; when the vehicle is in a charging mode, acquiring charging power received by the vehicle; if the charging power is less than or equal to the preset charging power, controlling one energy conversion device to charge the battery; and if the charging power is greater than the preset charging power, controlling two energy conversion devices to charge the battery at the same time. This application can improve the charge efficiency to vehicle battery on the one hand, and on the other hand meets when powerful when filling electric pile when the car, controls two energy conversion device and charges this battery simultaneously, when meetting the electric pile that fills of miniwatt, controls one of them energy conversion device and charges this battery, can improve the chargeable scope of car.
Description
Technical Field
The invention belongs to the field of vehicles, and particularly relates to a vehicle and a charging method and device thereof.
Background
At present, the development of electric vehicles is more and more rapid, and the charging efficiency of the electric vehicles is more and more emphasized by people, because the higher the charging efficiency is, the shorter the charging time is, and the more convenient the people use the vehicles.
However, most of the existing electric vehicles are only equipped with one set of charging system, and the one set of charging system is limited by the power capability of the motor topology, and the charging efficiency is often low; and when the power interval of charging is at light load or heavy load, the charging efficiency of the vehicle battery is also lower.
Disclosure of Invention
The embodiment of the invention provides a vehicle and a charging method and device thereof, and aims to solve the problem of low charging efficiency of the vehicle at present.
A method of charging a vehicle, applied to a vehicle including a charging port and a battery, the vehicle including first and second energy conversion devices disposed between the charging port and the battery;
when the vehicle is in a charging mode, acquiring charging power received by the vehicle;
if the charging power is less than or equal to the preset charging power, controlling one energy conversion device to charge the battery;
and if the charging power is greater than the preset charging power, controlling two energy conversion devices to charge the battery at the same time.
An apparatus for charging a vehicle, comprising: the charging device comprises an energy storage connecting end group, a charging port, a first energy conversion device and a second energy conversion device, wherein the energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end, and the charging port comprises a first charging connecting end and a second charging connecting end;
the first energy conversion device and the second energy conversion device are connected in parallel between the first energy storage connection terminal and the first charging connection terminal, and the first energy conversion device and the second energy conversion device are simultaneously connected in parallel between the second energy storage connection terminal and the second charging connection terminal;
if the charging power is less than or equal to the preset charging power, controlling one energy conversion device to charge an externally-connected battery through the energy storage connecting terminal group;
and if the charging power is greater than the preset charging power, controlling the two energy conversion devices to simultaneously charge the external battery through the energy storage connecting end group.
A vehicle comprises the vehicle charging device.
The vehicle and the charging method and the device thereof are characterized in that the first energy conversion device and the second energy conversion device are designed in the aspect of structure, when the charging power is less than or equal to the preset charging power, one energy conversion device is controlled to charge the battery, when the charging power is more than the preset charging power, the two energy conversion devices are controlled to charge the battery simultaneously, so that one of the two energy conversion devices can be selected to charge the battery at the same time, and the two energy conversion devices can be selected to charge the battery simultaneously under certain conditions, so that the charging efficiency of the vehicle battery can be improved, when the vehicle meets a charging pile with high power, the two energy conversion devices can be controlled to charge the battery simultaneously, when the vehicle meets the charging pile with low power, one of the energy conversion devices can be controlled to charge the battery, so that the chargeable range of the automobile is increased.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow diagram illustrating a method for charging a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a method of charging a vehicle according to an embodiment of the invention;
FIG. 3 is a schematic flow diagram of a method of charging a vehicle according to an embodiment of the invention;
FIG. 4 is a flow chart diagram of a method of charging a vehicle according to an embodiment of the invention;
FIG. 5 is a schematic flow diagram of a method of charging a vehicle according to an embodiment of the invention;
FIG. 6 is a flow chart diagram of a method of charging a vehicle according to an embodiment of the invention;
fig. 7 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 8 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 9 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 10 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 11 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 12 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 13 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a circuit configuration between the first motor coil and the first neutral switch according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In an embodiment, as shown in fig. 1, a method for charging a vehicle is provided, which is described by taking the method as an example of the device for charging a vehicle in fig. 7, and the method is applied to a vehicle including a charging port 10 and a battery, the vehicle including a first energy conversion device 30 and a second energy conversion device 40 disposed between the charging port 10 and the battery, and the method includes the following steps S101 to S103:
s101, when the vehicle is in a charging mode, obtaining charging power received by the vehicle.
In one embodiment, the charging power may be obtained by a received command from a BMS (Battery Management System) or other master control unit according to the size of the received command.
Wherein, whether the vehicle is in the charging mode or not can be judged according to the following steps (1) and (2):
(1) judging whether a charging command is detected by an MCU (micro controller Unit);
(2) and judging whether the rotating speed of the motor is less than a preset rotating speed or not.
When the conditions in the step (1) and the step (2) are simultaneously satisfied, the vehicle can be judged to be in the charging mode.
And S102, if the charging power is smaller than or equal to the preset charging power, controlling one energy conversion device to charge the battery.
In one embodiment, the preset charging power is 50kW or 60kW, for example.
One usage scenario according to the present embodiment is for example: the full-load power of a single energy conversion device is 100kW, the optimal application power interval of each energy conversion device is 30 kW-60 kW, when the received charging power is less than 60kW, one energy conversion device is controlled to charge a battery, when the received charging power exceeds 60kW, both energy conversion devices are controlled to charge an automobile battery, and the charging power between the two energy conversion devices is distributed through an equalization strategy so as to improve the overall system efficiency.
Further, as shown in fig. 3, the step S102 includes the following steps S1221 to S1226:
s1221, when the charging power is less than or equal to a preset charging power, obtaining optimal charging power intervals of the first energy conversion device 30 and the second energy conversion device 40, respectively;
s1222, determining whether the optimal charging power intervals corresponding to the first energy conversion device 30 and the second energy conversion device 40 are the same;
s1223, if the optimal charging power intervals corresponding to the first energy conversion device 30 and the second energy conversion device 40 are the same, randomly selecting one of the energy conversion devices to charge;
s1224, if the optimal charging power intervals corresponding to the first energy conversion device 30 and the second energy conversion device 40 are different, obtaining a first charging efficiency of the first energy conversion device 30 and a second charging efficiency of the second energy conversion device 40 according to the charging power and the corresponding relationship;
s1225, obtaining a power efficiency product of the first energy conversion device 30 and the second energy conversion device 40 according to the first charging efficiency and the second charging power;
and S1226, selecting the energy conversion device corresponding to the larger power efficiency product to charge.
In this embodiment, if the charging power is smaller than or equal to the preset charging power, one of the energy conversion devices is controlled to charge the battery, so that the vehicle can be charged when facing a low-power charging pile, and the chargeable range of the vehicle is improved.
Another advantage resides in: the two energy conversion devices work in the optimal charging power interval as much as possible, so that the two energy conversion devices can exert the optimal charging performance.
S103, if the charging power is larger than the preset charging power, controlling two energy conversion devices to charge the battery at the same time.
In the embodiment, when the charging power is larger than the preset charging power, the two energy conversion devices are controlled to charge the battery at the same time, and the charging power between the different energy conversion devices is distributed, so that the two energy conversion devices can charge the automobile battery efficiently, and when a high-power charging pile is faced, the two energy conversion devices can be controlled to charge the battery at the same time, and the charging efficiency of the automobile is improved to the maximum extent.
Further, as shown in fig. 2 and 3, this step S103 includes the following steps S1031 to S1033:
s1031, dividing the charging power into N groups of preset power distribution groups, wherein N is a positive integer greater than 1;
s1032, obtaining an optimal power distribution group according to the N groups of preset power distribution groups;
and step S1033, controlling the first energy conversion device 30 and the second energy conversion device 40 according to the optimal power distribution group to charge the battery at the same time.
Further, the step S1032 of obtaining an optimal power allocation group according to the N groups of preset power allocation groups includes the following steps (1) and (2):
(1) acquiring the sum of the power efficiency products of the first energy conversion device 30 and the second energy conversion device 40 corresponding to each preset power distribution group, wherein the power efficiency product is the product of the charging power and the corresponding charging efficiency of the first energy conversion device 30 and the second energy conversion device 40;
(2) and obtaining the power distribution group corresponding to the sum of the maximum power efficiency products as the optimal power distribution group.
The obtaining the sum of the power efficiency products of the first energy conversion device 30 and the second energy conversion device 40 corresponding to each preset power distribution group includes:
acquiring the corresponding relationship between the charging power and the charging efficiency of the first energy conversion device 30 and the second energy conversion device 40 respectively;
acquiring the charging efficiency of the first energy conversion device 30 and the second energy conversion device 40 corresponding to each preset power distribution group according to the corresponding relation;
and calculating the sum of the power efficiency products of the first energy conversion device 30 and the second energy conversion device 40 according to the charging efficiency and the power corresponding to each preset power distribution group.
One usage scenario according to the present embodiment is for example:
receiving a total power P from the BMS;
matching the total power P by a plurality of power pairs by adopting a minimum bisection method (P1, P2), wherein P1+ P2 is P;
each power P1, P2 corresponds to the charging efficiency eta1, eta2 of the respective system, wherein the power pair (P1, P2) that satisfies (eta1 × P1+ eta2 × P2) the maximum is the applied power allocation;
the powers P1, P2 are distributed to the first energy conversion device 30 and the second energy conversion device 40.
Wherein, when selecting a power ratio (P1, P2) with the best efficiency. If the search is performed according to the minimum bisection method, the set candidate points can be searched by using (P1 ═ P/2 and P2 ═ P/2) as a starting point, and the power ratio with the best overall efficiency can be selected from the candidate points.
For example: (P1, P2) was searched for (P/4, 3P/4), (3P/8, 5P/8), (5P/16, 11P/16), (9P/32, 23P/32), … …, as follows, until the value satisfying (eta1 × P1+ eta2 × P2) was maximum.
In the embodiment, the first energy conversion device 30 and the second energy conversion device 40 are designed in terms of structure, and when the charging power is less than or equal to the preset charging power, one of the energy conversion devices is controlled to charge the battery, and when the charging power is greater than the preset charging power, the two energy conversion devices are controlled to simultaneously charge the battery, so that one of the two energy conversion devices can be selected to charge the battery at the same time, and the two energy conversion devices can also be selected to simultaneously charge the battery under certain conditions, so that on one hand, the charging efficiency of the vehicle battery can be improved, on the other hand, when the automobile meets a high-power charging pile, the two energy conversion devices can be controlled to simultaneously charge the battery, and when the automobile meets a low-power charging pile, one of the energy conversion devices can be controlled to charge the battery, the chargeable range of the automobile is improved.
Further, as shown in fig. 8, the first energy conversion device 30 includes a first motor coil 31, a first bridge arm inverter 32;
the first arm inverter 32 is connected to the first motor coil 31. Specifically, each phase bridge arm in the first bridge arm converter 32 is connected to each phase coil in the first motor coil 31 in a one-to-one correspondence manner;
the first motor coil 31 and the first bridge arm converter 32 are both connected to the charging port 10, and the first bridge arm converter 32 is connected to the battery;
further, as shown in fig. 9, the second energy conversion device 40 includes a second motor coil 41, a second arm converter 42;
the second arm inverters 42 are connected to the second motor coils 41, respectively. Specifically, each phase bridge arm in the second bridge arm converter 42 is connected to each phase coil in the second motor coil 41 in a one-to-one correspondence manner;
the second motor coil 41 and the second arm converter 42 are connected to the charging port 10, and the second arm converter 42 is connected to the battery.
Further, as shown in fig. 10, the first motor coil 31, the first bridge arm inverter 32 and the charging port 10 form a first dc charging circuit to charge the battery; the first motor coil 31, the first bridge arm converter 32 and the battery form a first motor driving circuit; the second motor coil 41, the second bridge arm inverter 42 and the charging port 10 form a second dc charging circuit to charge the battery; the second motor coil 41, the second arm converter 42, and the battery form a second motor drive circuit.
Optionally, a first capacitor C1 is further included, and the first capacitor C1 is connected in parallel with the first bridge arm converter 32.
As shown in fig. 14, the first motor coil 31 and the second motor coil 41 include three-phase windings, each phase winding includes N coil branches, first ends of the N coil branches in each phase winding are connected to the bridge arm converter after being connected in common, second ends of the N coil branches in each phase winding are connected to second ends of the N coil branches in other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the charging port 10 is connected to M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.
Further, referring to fig. 14, the first energy conversion device 30 includes a first neutral point switch, and the second energy conversion device 40 includes a second neutral point switch, the first neutral point switch being configured to control M neutral points of the N neutral points of the first motor coil 31 to be connected to the charging port 10, and the second neutral point switch being configured to control M neutral points of the N neutral points of the second motor coil 41 to be connected to the charging port 10.
In the following, the first motor coil 31 includes three-phase windings, each of which includes four coil branches, and the three-phase windings include an a-phase winding, a B-phase winding, and a C-phase winding, as shown in fig. 14, where the first neutral point switch K2 includes a first switch K2-1, a second switch K2-2, a third switch K2-3, and a fourth switch K2-4, one end of the first switch K2-1 is connected to the charging port 10, and the other end thereof is connected to the first coil branch of the a-phase winding, the first coil branch of the B-phase winding, and the first coil branch of the C-phase winding, respectively; one end of a second switch K2-2 is connected with the charging port 10, and the other end of the second switch K2-2 is respectively connected with the second coil branch of the phase A winding, the second coil branch of the phase B winding and the second coil branch of the phase C winding; one end of a third switch K2-3 is connected with the charging port 10, and the other end of the third switch K2-3 is respectively connected with the third coil branch of the A-phase winding, the third coil branch of the B-phase winding and the third coil branch of the C-phase winding; one end of the fourth switch K2-4 is connected to the charging port 10, and the other end is connected to the fourth coil branch of the a-phase winding, the fourth coil branch of the B-phase winding, and the fourth coil branch of the C-phase winding, respectively. The charging power of the first energy conversion device can be controlled by controlling the number of the four neutral point switches closed.
Optionally, a first inductor N1 is further included, one end of the first inductor N1 is connected to the first motor coil 31, and the other end of the first inductor N1 is connected to the first neutral switch K2.
Optionally, a second inductor N2 is further included, one end of the first inductor N2 is connected to the second motor coil 41, and the other end of the second inductor N2 is connected to the second neutral switch K4.
The connection relationship between each winding in the second motor coil 41 and each neutral point switch K4 is the same as that between each winding in the first motor coil and each neutral point switch, and the circuit connection diagram thereof can refer to fig. 14.
In the present embodiment, the neutral point switch K2 is added to the first energy conversion device 30, so that the neutral point switch K2 connects the charging port 10 with M neutral points of the N neutral points of the first motor coil 31, and the second neutral point switch K4 is added to the second energy conversion device 40, so that the neutral point switch K4 connects the charging port 10 with M neutral points of the N neutral points of the second motor coil 41, thereby facilitating the energy conversion device to turn on or off the switches in the neutral point switches as needed, and selecting different numbers of coil branches in the three-phase windings of the motor coil, thereby realizing the adjustment of the charging power.
Alternatively, as shown in fig. 11, 12 and 13, first energy conversion device 30 includes a first bidirectional leg 33, and second energy conversion device 40 includes a second bidirectional leg 43;
the first bidirectional bridge arm 33 is connected in parallel with the first bridge arm converter 32, and the first bidirectional bridge arm 33 is connected with the charging port 10;
second bidirectional arm 43 is connected in parallel to second arm converter 42, and second bidirectional arm 43 is connected to charging port 10.
Further, the first motor coil 31, the first arm converter 32, the first bidirectional arm 33 and the charging port 10 form a first ac charging circuit to charge a battery; the second motor coil 41, the second arm converter 42, the second bidirectional arm 43, and the charging port 10 form a second ac charging circuit to charge a battery.
Further, the first leg converter 32 and the second leg converter 42 each include a three-phase leg; when the first energy conversion device 30 and/or the second energy conversion device 40 work in the dc charging mode or the ac charging mode, the first bridge arm converter 32 and/or the second bridge arm converter 42 receive a first control signal, a second control signal and a third control signal, and the first control signal, the second control signal and the third control signal sequentially differ by a preset phase;
the first control signal controls the two power switch units of the first phase bridge arm to be alternately conducted, and the second control signal controls the two power switch units of the second phase bridge arm to be alternately conducted; the third control signal controls the two power switch units of the third phase bridge arm to be alternately conducted so as to realize direct current charging or alternating current charging.
Wherein the first energy transforming device 30 comprises a first electrical machine 32 comprising a first electrical machine coil 31; the second energy transforming device 40 comprises a second electrical machine 42 comprising a second electrical machine coil 41; the first motor and the second motor are both driving motors of the vehicle.
Optionally, when the vehicle is in the charging mode, before the charging power received by the charging system is acquired, the method for charging the vehicle further includes:
when a charging command is received, detecting the rotating speed of the vehicle;
if the rotating speed is lower than the preset rotating speed, judging whether the vehicle is in a locking state;
and if the vehicle is in a locked state, switching the charging system to the charging mode.
Since the vehicle is in a locked state to prevent the vehicle from slipping when the electric vehicle is in the stop-charging state, it is possible to determine whether or not the charging system can be switched to the charging mode based on this characteristic.
Optionally, before controlling the first energy conversion device 30 and the second energy conversion device 40 to charge the battery simultaneously, the method for charging the vehicle further includes:
fault detection of the first energy conversion device 30 and the second energy conversion device 40;
and if the fault of one energy conversion device is detected, controlling the other energy conversion device to charge the battery.
In the embodiment, when a fault of one energy conversion device is detected, the other energy conversion device is controlled to charge the battery, so that when the fault of one energy conversion device exists, the battery of the automobile can be charged through the other energy conversion device, and the chargeable range of the automobile is further improved.
A usage scenario flow according to the present embodiment is shown in fig. 4 and fig. 6, in one usage scenario, the first energy conversion device 30 corresponds to each module in the predecessor in fig. 4, the second energy conversion device 40 corresponds to each module in the descendant in fig. 4, the "predecessor" in the application scenario in fig. 5 corresponds to the "first" in the above-mentioned embodiment, and the "descendant" in the application scenario in fig. 5 corresponds to the "second" in the above-mentioned embodiment.
In one embodiment, the first electric machine is a front drive machine of the vehicle, the front drive machine controller includes a first leg inverter, the second electric machine is a rear drive machine of the vehicle, and the rear drive machine controller includes a second leg inverter. Therefore, the front drive motor and the front drive motor controller are used as a first set of charging device, the rear drive motor and the rear drive motor controller are used as a second set of charging device, and the charging method can be realized without additionally adding a vehicle-mounted charger, so that the functions of vehicle driving and charging are integrated, and the vehicle cost is reduced.
In the implementation process of the charging function, the following procedures S1 to S92 are included.
And S1, after the vehicle stops, self-checking and judging that the chargeable condition is met, entering a charging function mode and waiting for receiving a charging command.
And S2, judging whether a charging command is received.
S31, if receiving the charging command, the front and back charging power distribution can be carried out according to the charging power, if not, the step S32 is entered, and 1 is in a waiting state; when the power is charged, the instructions of the BMS or other main control units are received, and one energy conversion device or two energy conversion devices are judged to be applied according to the size of the received instructions.
S4, determining whether the power of the received charge is greater than the set charge power (for example, 50 kW).
S51, when the received charging power is larger than the set value (for example, 50kW), the front and rear energy conversion devices can be ready to be activated, otherwise, the process proceeds to step S52, and only the first energy conversion device in the front drive or the second energy conversion device in the rear drive is selected. Alternatively, the following settings may be set: the first energy conversion device of the front drive has a higher priority than the second energy conversion device of the rear drive.
And S6, judging whether the two charging systems have faults or not, and disabling the charging mode.
S71, if the two charging systems are not in fault, the two charging systems can be normally applied to charge, the balance distribution of the two systems is carried out on the power supply power after a charging instruction is received, the distribution of the charging power is preset according to the efficient condition of the system, for example, the full load power of a single charging system is 100kW, the optimal application power interval is 30 kW-60 kW, when the received charging power is less than 60kW, one set of charging power is applied, when the received charging power exceeds 60kW, the two sets of charging systems are applied, and the balance application is carried out to improve the efficiency of the whole system.
S72, if a fault exists, further judging which system has the fault, charging by using the set of energy conversion devices which do not have the fault, and performing alarm processing; and if the two sets of energy conversion devices have faults, charging is not carried out, and alarm processing is carried out.
S81 is charged in the state of step S71, and it is determined whether or not a command to stop charging has been received.
S82 is charged in the state of step S72, and it is determined whether or not a command to stop charging has been received.
And S91, stopping charging and shutting down the wave if receiving the command of stopping charging. If no command for stopping charging is received, the corresponding operation of step S71 is continued, and the charging process is performed.
And S92, stopping charging and shutting down the wave if receiving the command of stopping charging. If no command for stopping charging is received, the corresponding operation of step S72 is continued, and the charging process is performed.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the embodiment, in terms of method, when the charging power is less than or equal to the preset charging power, one of the energy conversion devices is controlled to charge the battery, and when the charging power is greater than the preset charging power, the two energy conversion devices are controlled to charge the battery at the same time, so that one of the two energy conversion devices can be selected to charge the battery at the same time, the two energy conversion devices can be selected to charge the battery simultaneously under certain conditions, so that the charging efficiency of the vehicle battery can be improved on one hand, and when the automobile meets a high-power charging pile on the other hand, can control two energy conversion devices to charge the battery at the same time, when meeting a charging pile with low power, one of the energy conversion devices can be controlled to charge the battery, so that the chargeable range of the automobile is increased.
Fig. 7 is a schematic circuit configuration diagram of a vehicle charging apparatus according to an embodiment of the present invention, and another vehicle charging apparatus according to another invention of the present invention is shown in fig. 7, and includes: the charging system comprises an energy storage connection terminal set 20, a charging port 10, a first energy conversion device 30 and a second energy conversion device 40, wherein the energy storage connection terminal set 20 comprises a first energy storage connection terminal and a second energy storage connection terminal, and the charging port 10 comprises a first charging connection terminal and a second charging connection terminal;
the first energy conversion device 30 and the second energy conversion device 40 are connected in parallel between the first energy storage connection and the first charging connection, and the first energy conversion device 30 and the second energy conversion device 40 are simultaneously connected in parallel between the second energy storage connection and the second charging connection;
if the charging power is less than or equal to the preset charging power, controlling one of the energy conversion devices to charge the external battery through the energy storage connecting terminal group 20;
if the charging power is greater than the preset charging power, the two energy conversion devices are controlled to simultaneously charge the external battery through the energy storage connection end group 20.
In one embodiment thereof, the preset charging power is, for example, 50kW or 60 kW.
One use scenario according to the present embodiment is for example: the full-load power of a single energy conversion device is 100kW, the optimal application power interval of each energy conversion device is 30 kW-60 kW, when the received charging power is less than 60kW, one energy conversion device is controlled to charge a battery, when the received charging power exceeds 60kW, both energy conversion devices are controlled to charge an automobile battery, and the charging power between the two energy conversion devices is distributed through an equalization strategy so as to improve the overall system efficiency.
When the charging power is less than or equal to the preset charging power, one of the energy conversion devices can be selected to charge the automobile battery in the following modes:
acquiring optimal charging power intervals of the first energy conversion device 30 and the second energy conversion device 40 respectively;
judging whether the optimal charging power intervals corresponding to the first energy conversion device 30 and the second energy conversion device 40 are the same;
if the optimal charging power intervals corresponding to the first energy conversion device 30 and the second energy conversion device 40 are the same, randomly selecting one of the energy conversion devices to charge;
if the optimal charging power intervals corresponding to the first energy conversion device 30 and the second energy conversion device 40 are different, acquiring a first charging efficiency of the first energy conversion device 30 and a second charging efficiency of the second energy conversion device 40 according to the charging power and the corresponding relation;
obtaining a power efficiency product of the first energy conversion device 30 and the second energy conversion device 40 according to the first charging efficiency and the second charging power;
and selecting the energy conversion device corresponding to the larger power efficiency product for charging.
In this embodiment, if the charging power is smaller than or equal to the preset charging power, one of the energy conversion devices is controlled to charge the battery, so that the vehicle can be charged when facing a low-power charging pile, and the chargeable range of the vehicle is improved.
Alternatively, when two energy conversion devices are selected simultaneously to charge the vehicle battery, power distribution between the two energy conversion devices is required, and specifically, power distribution between the two energy conversion devices may be performed in the following manner:
dividing the charging power into N groups of preset power distribution groups, wherein N is a positive integer greater than 1;
obtaining an optimal power distribution group according to the N groups of preset power distribution groups;
and controlling the first energy conversion device 30 and the second energy conversion device 40 to charge the battery simultaneously according to the optimal power distribution group.
Further, the obtaining of an optimal power allocation group according to N groups of preset power allocation groups may be implemented by the following steps (1) and (2):
(1) and obtaining a sum of power efficiency products of the first energy conversion device 30 and the second energy conversion device 40 corresponding to each preset power distribution group, wherein the power efficiency product is a product of charging power and corresponding charging efficiency of the first energy conversion device 30 and the second energy conversion device 40.
The sum of the power efficiency products of the first energy conversion device 30 and the second energy conversion device 40 corresponding to each preset power distribution group may be obtained by:
acquiring the corresponding relationship between the charging power and the charging efficiency of the first energy conversion device 30 and the second energy conversion device 40 respectively;
acquiring the charging efficiency of the first energy conversion device 30 and the second energy conversion device 40 corresponding to each preset power distribution group according to the corresponding relation;
and calculating the sum of the power efficiency products of the first energy conversion device 30 and the second energy conversion device 40 according to the charging efficiency and the power corresponding to each preset power distribution group.
(2) And obtaining the power distribution group corresponding to the maximum power efficiency product as the optimal power distribution group.
One usage scenario according to the present embodiment is for example:
receiving a total power P from the BMS;
matching (P1, P2) the total power P by a plurality of power pairs using a minimum bisection method, wherein P1+ P2 is P;
each power P1, P2 corresponds to the charging efficiency eta1, eta2 of the respective system, wherein the power pair (P1, P2) that satisfies (eta1 × P1+ eta2 × P2) the maximum is the applied power allocation;
power P1, P2 is distributed to the first energy transforming device 30 and the second energy transforming device 40.
Wherein, when selecting a power ratio (P1, P2) with the best efficiency. If the search is performed according to the minimum dichotomy, the set candidate points can be searched starting from (P1 ═ P/2, P2 ═ P/2), and the power allocation with the best overall efficiency can be selected from the candidate points.
For example: (P1, P2) search for (P/4, 3P/4), (3P/8, 5P/8), (5P/16, 11P/16), (9P/32, 23P/32), … … as follows until the value satisfying (eta1 × P1+ eta2 × P2) is maximum.
In the embodiment, when the charging power is larger than the preset charging power, the two energy conversion devices are controlled to charge the battery at the same time, and the charging power between the different energy conversion devices is distributed, so that the two energy conversion devices can charge the automobile battery efficiently, and when a high-power charging pile is faced, the two energy conversion devices can be controlled to charge the battery at the same time, and the charging efficiency of the automobile is improved to the maximum extent.
Further, fig. 8 is a schematic diagram of a circuit structure of a vehicle charging apparatus according to an embodiment of the present invention, as shown in fig. 8, the first energy conversion apparatus 30 includes a first motor coil 31, a first arm converter 32;
the first bridge arm inverter 32 is connected to the first motor coil 31;
the first motor coil 31 and the first bridge arm converter 32 are both connected to the charging port 10, and the first bridge arm converter 32 is connected to the energy storage connection terminal group 20;
fig. 9 is a schematic circuit diagram of a vehicle charging apparatus according to an embodiment of the present invention, and as shown in fig. 9, the second energy conversion apparatus 40 includes a second motor coil 41 and a second arm converter 42;
the second bridge arm inverter 42 is connected to the second motor coil 41;
the second motor coil 41 and the second arm converter 42 are connected to the charging port 10, and the second arm converter 42 is connected to the energy storage connection terminal group 20.
The first motor coil 31, the first bridge arm converter 32 and the charging port 10 form a first dc charging circuit to charge an external battery;
the first motor coil 31, the first bridge arm converter 32 and the energy storage connection terminal group 20 form a first motor driving circuit;
the second motor coil 41, the second bridge arm converter 42 and the charging port 10 form a second dc charging circuit to charge the battery;
the second motor coil 41, the second arm converter 42, and the energy storage connection terminal group 20 form a second motor drive circuit.
The first motor coil 31 and the second motor coil 41 include three-phase windings, each phase winding includes N coil branches, first ends of the N coil branches in each phase winding are connected together and then connected to the bridge arm converter, second ends of the N coil branches in each phase winding are connected to second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the charging port 10 is connected to M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.
Wherein the first energy conversion device 30 includes a first neutral point switch, the second energy conversion device 40 includes a second neutral point switch K4, the first neutral point switch is used for controlling M neutral points of the N neutral points of the first motor coil 31 to be connected with the charging port 10, the second neutral point switch K4 is used for controlling M neutral points of the N neutral points of the second motor coil 41 to be connected with the charging port 10.
The following description will be made by taking an example in which the first motor coil 31 includes three-phase windings, each of which includes four coil branches, and the three-phase windings respectively include an a-phase winding, a B-phase winding and a C-phase winding, as shown in fig. 14, where the first neutral point switch K2 includes a first switch K2-1, a second switch K2-2, a third switch K2-3 and a fourth switch K2-4, one end of the first switch K2-1 is connected to the charging port 10, and the other end thereof is connected to the first coil branch of the a-phase winding, the first coil branch of the B-phase winding and the first coil branch of the C-phase winding; one end of a second switch K2-2 is connected with the charging port 10, and the other end of the second switch K2-2 is respectively connected with the second coil branch of the phase A winding, the second coil branch of the phase B winding and the second coil branch of the phase C winding; one end of a third switch K2-3 is connected with the charging port 10, and the other end of the third switch K2-3 is respectively connected with the third coil branch of the A-phase winding, the third coil branch of the B-phase winding and the third coil branch of the C-phase winding; one end of a fourth switch K2-4 is connected to the charging port 10, and the other end is connected to the fourth coil branch of the phase a winding, the fourth coil branch of the phase B winding, and the fourth coil branch of the phase C winding, respectively.
The connection relationship between each winding in the second motor coil 41 and each switch in the neutral point switch K4 is the same as the connection relationship between each winding in the first motor and each neutral point switch, and the circuit connection diagram thereof can refer to fig. 14.
In the present embodiment, the neutral point switch K2 is added to the first energy conversion device 30, so that the neutral point switch K2 connects the charging port 10 with M neutral points of the N neutral points of the first motor coil 31, and the second neutral point switch K4 is added to the second energy conversion device 40, so that the neutral point switch K4 connects the charging port 10 with M neutral points of the N neutral points of the second motor coil 41, thereby facilitating the energy conversion device to turn on or off the switches in the neutral point switches as needed, and selecting different numbers of coil branches in the three-phase windings of the motor coil, thereby realizing the adjustment of the charging power.
Further, the first energy conversion device 30 includes a first bidirectional leg 33, and the second energy conversion device 40 includes a second bidirectional leg 43;
the first bidirectional arm 33 is connected in parallel with the first arm converter 32, and the first bidirectional arm 33 is connected to the charging port 10;
the second bidirectional arm 43 is connected in parallel to the second arm converter 42, and the second bidirectional arm 43 is connected to the charging port 10.
The first motor coil 31, the first bridge arm converter 32, the first bidirectional bridge arm 33 and the charging port 10 form a first ac charging circuit to charge an external battery; the second motor coil 41, the second arm converter 42, the second bidirectional arm 43 and the charging port 10 form a second ac charging circuit to charge an external battery.
Further, the first leg converter 32 and the second leg converter 42 each include a three-phase leg; when the first energy conversion device 30 and/or the second energy conversion device 40 operate in the dc charging mode or the ac charging mode, the first bridge arm converter 32 and/or the second bridge arm converter 42 receive a first control signal, a second control signal, and a third control signal, and the first control signal, the second control signal, and the third control signal sequentially differ by a predetermined phase.
For the switching tubes, since the high-power switching tubes are more expensive than the low-power switching tubes, based on consideration of different powers required when the energy conversion device operates in the motor driving mode, the dc charging mode, and the ac charging mode, the types of the switching tubes in the first arm converter 32 are different from the types of the switching tubes in the first bidirectional arm 33, that is, the first bidirectional arm 33 and the first arm converter 32 use switching tubes with different power levels, and in one embodiment, the power level of the switching tubes used in the first arm converter 32 is greater than that of the switching tubes used in the first bidirectional arm 33. For example: among the same type of switching tubes, the first bridge arm converter 32 employs a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) switching tube with a high current level, and the first bidirectional bridge arm 33 employs a MOSFET switching tube with a low current level; or for example: among the different types of switching tubes, the first arm converter 32 uses a high-power IGBT switching tube, and the first bidirectional arm converter 33 uses a low-power MOSFET switching tube. Specifically, in the present embodiment, since the first bridge arm converter 32 is used in both the dc charging mode and the high power mode such as the motor driving mode, the first bridge arm converter 32 in the present embodiment is implemented by using a high power IGBT (Insulated Gate Bipolar Transistor) switch tube or a high current level MOSFET switch tube, and since the first bidirectional bridge arm 33 mainly works in the ac charging mode, the first bidirectional bridge arm 33 can be implemented by using a low power MOSFET, so that the circuit cost can be reduced while the energy conversion device is ensured to work effectively.
On the other hand, when ac charging is performed, the switching frequency required for the first bidirectional arm 33 is high (for example, 60kHz), so that it is necessary to use a MOSFET switching tube or a silicon carbide MOSFET switching tube that is efficient in high-frequency operation, and since the first arm converter 32 has three-phase arms and its operation mode is three-phase interleaved control, the frequency required for the switching tube of the first arm converter 32 is low, so that the type of the switching tube in the first arm converter 32 is different from the type of the switching tube in the first bidirectional arm 33, for example: the switching tube type in the first bridge arm converter 32 is an IGBT switching tube with high efficiency in low-frequency operation.
The same is true for the relationship between the second bidirectional leg 43 and the second leg converter 42, which is not described here again.
In the embodiment, the first two-phase bridge arm is added to the first energy conversion device 30, and the second two-phase bridge arm 43 is added to the second energy conversion device 40, so that the energy conversion device can charge the battery through alternating current, and the chargeable range of the charging device is further increased.
Optionally, a first capacitor C1 is further included, and the first capacitor C1 is connected in parallel with the first bridge arm converter 32.
Optionally, a second capacitor C2 is further included, and the first capacitor C2 is connected in parallel with the second bridge arm converter 42.
During specific operation, when the first energy conversion device 30 operates in the dc charging mode or the ac charging mode, the first capacitor C1 filters the voltages output by the first arm converter 32 and the first bidirectional arm 33 during the dc charging process or the ac charging process, and stores energy according to the voltages output by the first arm converter 32 and the bidirectional arm 33, so as to complete dc charging or ac charging of the battery. Similarly, in addition to filtering the voltages output by the second bridge arm converter 42 and the second bidirectional bridge arm 43, the capacitor C2 may also store energy according to the voltages output by the second bridge arm converter 42 and the second bidirectional bridge arm 43 during the dc charging process or the ac charging process.
The first control signal controls the two power switch units of the first phase bridge arm to be alternately conducted, and the second control signal controls the two power switch units of the second phase bridge arm to be alternately conducted; the third control signal controls the two power switch units of the third phase bridge arm to be alternately conducted so as to realize direct current charging or alternating current charging.
Wherein the first energy transforming device 30 comprises a first electric machine comprising a first electric machine coil 31; the second energy transforming device 40 comprises a second electrical machine comprising a second electrical machine coil 41; the first motor and the second motor are both driving motors of the vehicle.
The vehicle charging device further includes a fifth switch K1 and a sixth switch K3, one end of the fifth switch K1 is connected in parallel with one end of the capacitor C1 and then connected to the first bridge arm converter 32, the other end of the fifth switch K1 is connected to the second bridge arm converter 42 and the first energy storage connection end, one end of the sixth switch K3 is connected in parallel with one end of the capacitor C2 and then connected to the second bridge arm converter 42, and the other end of the sixth switch K3 is connected to the first bridge arm converter 32 and the second energy storage connection end. In the embodiment, the first energy conversion device 30 and the second energy conversion device 40 are structurally designed, so that when the charging power is less than or equal to the preset charging power, one of the energy conversion devices can be controlled to charge the battery, and when the charging power is greater than the preset charging power, the two energy conversion devices can be controlled to charge the battery simultaneously, so that one of the two energy conversion devices can be selected to charge the battery at the same time, and under certain conditions, the two energy conversion devices can be selected to charge the battery simultaneously, on one hand, the charging efficiency of the vehicle battery can be improved, on the other hand, when the vehicle meets a high-power charging pile, the two energy conversion devices can be controlled to charge the battery simultaneously, and when the vehicle meets a low-power charging pile, one of the energy conversion devices can be controlled to charge the battery, the chargeable range of the automobile is improved.
According to a further aspect of the invention, the embodiment of the present application further provides a vehicle, and the vehicle includes the apparatus for charging the vehicle in the above embodiment.
It should be noted that, since the vehicle charging device included in the vehicle provided in the embodiment of the present application is the same as the vehicle charging device shown in fig. 7 to 13, reference may be made to the foregoing detailed description about fig. 7 to 13 for specific operating principles of the power system in the vehicle provided in the embodiment of the present application, and details are not repeated here.
The vehicle is provided with the vehicle charging device and the vehicle charging method is applied, the first energy conversion device 30 and the second energy conversion device 40 are designed in terms of structure, when the charging power is less than or equal to the preset charging power, one energy conversion device is controlled to charge the battery, when the charging power is greater than the preset charging power, the two energy conversion devices are controlled to charge the battery simultaneously, one of the two energy conversion devices can be selected to charge the battery at the same time, and the two energy conversion devices can be selected to charge the battery simultaneously under certain conditions, so that the charging efficiency of the vehicle battery can be improved on one hand, and when the vehicle meets high-power charging pile, the two energy conversion devices can be controlled to charge the battery simultaneously on the other hand, when meeting the charging pile with low power, one of the energy conversion devices can be controlled to charge the battery, so that the chargeable range of the automobile is improved.
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the apparatus may be divided into different functional units or modules to perform all or part of the above described functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (23)
1. A method of charging a vehicle, characterized by being applied to a vehicle including a charging port and a battery, the vehicle including a first energy conversion device and a second energy conversion device disposed between the charging port and the battery;
when the vehicle is in a charging mode, acquiring charging power received by the vehicle;
if the charging power is less than or equal to the preset charging power, controlling one energy conversion device to charge the battery;
if the charging power is greater than the preset charging power, controlling two energy conversion devices to charge the battery at the same time, including:
dividing the charging power into N groups of preset power distribution groups, wherein N is a positive integer greater than 1;
obtaining an optimal power distribution group according to the N groups of preset power distribution groups, including:
acquiring the sum of power efficiency products of the first energy conversion device and the second energy conversion device corresponding to each preset power distribution group, wherein the power efficiency product is the product of the charging power of the first energy conversion device and the second energy conversion device and the corresponding charging efficiency;
obtaining a power distribution group corresponding to the sum of the maximum power efficiency products as the optimal power distribution group;
and controlling the first energy conversion device and the second energy conversion device to charge the battery simultaneously according to the optimal power distribution group.
2. The vehicle charging method of claim 1, wherein the first energy conversion device comprises a first motor coil, a first leg inverter;
the first bridge arm converter is respectively connected with the first motor coil;
the first motor coil and the first bridge arm converter are connected with the charging port, and the first bridge arm converter is connected with the battery;
the second energy conversion device comprises a second motor coil and a second bridge arm converter;
the second bridge arm converter is respectively connected with the second motor coil;
the second motor coil and the second bridge arm converter are connected with the charging port, and the second bridge arm converter is connected with the battery.
3. The vehicle charging method according to claim 2,
the first motor coil, the first bridge arm converter and the charging port form a first direct current charging circuit to charge the battery;
the first motor coil, the first bridge arm converter and the battery form a first motor driving circuit;
the second motor coil, the second bridge arm converter and the charging port form a second direct current charging circuit to charge the battery;
the second motor coil, the second bridge arm converter, and the battery form a second motor drive circuit.
4. The vehicle charging method according to claim 3, wherein the first motor coil and the second motor coil comprise three-phase windings, each phase winding comprises N coil branches, first ends of the N coil branches in each phase winding are connected with the bridge arm converter after being connected in common, second ends of the N coil branches in each phase winding are connected with second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the charging port is connected with the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.
5. The vehicle charging method according to claim 4, wherein the first energy conversion device includes a first neutral switch, and the second energy conversion device includes a second neutral switch, the first neutral switch being configured to control M of the N neutral points of the first electric machine coil to be connected to the charging port, the second neutral switch being configured to control M of the N neutral points of the second electric machine coil to be connected to the charging port.
6. The vehicle charging method of claim 5, wherein the first energy conversion device comprises a first bidirectional leg and the second energy conversion device comprises a second bidirectional leg;
the first bidirectional bridge arm is connected with the first bridge arm converter in parallel, and the first bidirectional bridge arm is connected with the charging port;
the second bidirectional bridge arm is connected with the second bridge arm converter in parallel, and the second bidirectional bridge arm is connected with the charging port.
7. The vehicle charging method of claim 6, wherein said first motor coil, said first leg inverter, said first bidirectional leg, and said charging port form a first AC charging circuit to charge a battery; the second motor coil, the second bridge arm inverter, the second bidirectional bridge arm and the charging port form a second alternating current charging circuit to charge a battery.
8. The method of charging a vehicle of claim 7, wherein said first leg converter and second leg converter each comprise a three-phase leg; when the first energy conversion device and/or the second energy conversion device work in the direct current charging mode or the alternating current charging mode, the first bridge arm converter and/or the second bridge arm converter receive a first control signal, a second control signal and a third control signal, and the first control signal, the second control signal and the third control signal sequentially differ by a preset phase;
the first control signal controls the two power switch units of the first phase bridge arm to be alternately conducted, and the second control signal controls the two power switch units of the second phase bridge arm to be alternately conducted; and the third control signal controls the two power switch units of the third phase bridge arm to be alternately conducted so as to realize direct current charging or alternating current charging.
9. The method of charging a vehicle of claim 1, wherein the first energy conversion device comprises a first electric machine including a first electric machine coil; the second energy conversion device comprises a second electric machine comprising a second electric machine coil; the first motor and the second motor are both driving motors of the vehicle.
10. The method of charging a vehicle according to claim 1, wherein said obtaining a sum of power efficiency products of the first energy conversion device and the second energy conversion device for each predetermined power allocation group comprises:
respectively acquiring the corresponding relation between the charging power and the charging efficiency of the first energy conversion device and the second energy conversion device;
acquiring the charging efficiency of the first energy conversion device and the second energy conversion device corresponding to each preset power distribution group according to the corresponding relation;
and calculating the sum of the power efficiency products of the first energy conversion device and the second energy conversion device according to the charging efficiency and the power corresponding to each preset power distribution group.
11. The method for charging a vehicle according to claim 10, wherein if the charging power is less than or equal to a predetermined charging power, controlling one of the energy conversion devices to charge the battery comprises:
when the charging power is smaller than or equal to a preset charging power, respectively acquiring optimal charging power intervals of the first energy conversion device and the second energy conversion device;
if the optimal charging power intervals corresponding to the first energy conversion device and the second energy conversion device are the same, one of the energy conversion devices is randomly selected to be charged;
if the optimal charging power intervals corresponding to the first energy conversion device and the second energy conversion device are different, acquiring a first charging efficiency of the first energy conversion device and a second charging efficiency of the second energy conversion device according to the charging power and the corresponding relation;
respectively acquiring power efficiency products of the first energy conversion device and the second energy conversion device according to the first charging efficiency and the second charging power;
and selecting the energy conversion device corresponding to the larger power efficiency product for charging.
12. The method of charging a vehicle of claim 1, wherein prior to said obtaining charging power received by said first and second energy conversion devices while said vehicle is in a charging mode, said method of charging a vehicle further comprises:
detecting the rotating speed of the vehicle when a charging command is received;
if the rotating speed is lower than the preset rotating speed, judging whether the vehicle is in a locking state;
and if the vehicle is in a locked state, switching the charging system to the charging mode.
13. The method of charging a vehicle according to any one of claims 1 to 12, wherein before said controlling said first energy conversion device and said second energy conversion device to simultaneously charge said battery, said method of charging a vehicle further comprises:
fault detection is carried out on the first energy conversion device and the second energy conversion device;
and if the fault of one energy conversion device is detected, controlling the other energy conversion device to charge the battery.
14. An apparatus for charging a vehicle, comprising: the charging device comprises an energy storage connecting end group, a charging port, a first energy conversion device and a second energy conversion device, wherein the energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end, and the charging port comprises a first charging connecting end and a second charging connecting end;
the first energy conversion device and the second energy conversion device are connected in parallel between the first energy storage connection terminal and the first charging connection terminal, and the first energy conversion device and the second energy conversion device are simultaneously connected in parallel between the second energy storage connection terminal and the second charging connection terminal;
if the charging power is less than or equal to the preset charging power, controlling one energy conversion device to charge the externally-connected battery through the energy storage connecting end group;
if the charging power is greater than the preset charging power, controlling two energy conversion devices to simultaneously charge an external battery through the energy storage connecting end group, and comprising the following steps:
dividing the charging power into N groups of preset power distribution groups, wherein N is a positive integer greater than 1;
obtaining an optimal power distribution group according to the N groups of preset power distribution groups, including:
acquiring the sum of power efficiency products of the first energy conversion device and the second energy conversion device corresponding to each preset power distribution group, wherein the power efficiency product is the product of the charging power of the first energy conversion device and the second energy conversion device and the corresponding charging efficiency;
obtaining a power distribution group corresponding to the sum of the maximum power efficiency products as the optimal power distribution group;
and controlling the first energy conversion device and the second energy conversion device to charge the battery simultaneously according to the optimal power distribution group.
15. The apparatus of claim 14, wherein the first energy conversion device comprises a first motor coil, a first leg inverter;
the first bridge arm converter is respectively connected with the first motor coil;
the first motor coil and the first bridge arm converter are connected with the charging port, and the first bridge arm converter is connected with the energy storage connecting end group;
the second energy conversion device comprises a second motor coil and a second bridge arm converter;
the second bridge arm converter is respectively connected with the second motor coil;
the second motor coil and the second bridge arm converter are connected with the charging port, and the second bridge arm converter is connected with the energy storage connecting end group.
16. The apparatus of claim 15,
the first motor coil, the first bridge arm converter and the charging port form a first direct current charging circuit to charge an external battery;
the first motor coil, the first bridge arm converter and the energy storage connecting end group form a first motor driving circuit;
the second motor coil, the second bridge arm converter and the charging port form a second direct current charging circuit to charge the battery;
the second motor coil, the second bridge arm converter and the energy storage connection end group form a second motor driving circuit.
17. The apparatus of claim 16, wherein the first and second electric machine coils comprise three-phase windings, each phase winding comprises N coil branches, first ends of the N coil branches in each phase winding are connected to the bridge arm converter after being connected in common, second ends of the N coil branches in each phase winding are connected to second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the charging port is connected to the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.
18. The apparatus of claim 17 wherein the first energy conversion device comprises a first neutral switch and the second energy conversion device comprises a second neutral switch, the first neutral switch being configured to control M of the N neutral points of the first motor coil to be connected to the charge port and the second neutral switch being configured to control M of the N neutral points of the second motor coil to be connected to the charge port.
19. The apparatus of claim 14, wherein the first energy conversion device comprises a first bidirectional leg and the second energy conversion device comprises a second bidirectional leg;
the first bidirectional bridge arm is connected with the first bridge arm converter in parallel, and the first bidirectional bridge arm is connected with the charging port;
the second bidirectional bridge arm is connected with the second bridge arm converter in parallel, and the second bidirectional bridge arm is connected with the charging port.
20. The apparatus of claim 18, wherein the first energy conversion device comprises a first bidirectional leg and the second energy conversion device comprises a second bidirectional leg;
the first bidirectional bridge arm is connected with the first bridge arm converter in parallel, and the first bidirectional bridge arm is connected with the charging port;
the second bidirectional bridge arm is connected with the second bridge arm converter in parallel, and the second bidirectional bridge arm is connected with the charging port;
the first motor coil, the first bridge arm converter, the first bidirectional bridge arm and the charging port form a first alternating-current charging circuit to charge an external battery; the second motor coil, the second bridge arm converter, the second bidirectional bridge arm and the charging port form a second alternating current charging circuit to charge an external battery.
21. The apparatus of claim 20, wherein the first leg converter and the second leg converter each comprise a three-phase leg; when the first energy conversion device and/or the second energy conversion device work in the direct current charging mode or the alternating current charging mode, the first bridge arm converter and/or the second bridge arm converter receive a first control signal, a second control signal and a third control signal, and the first control signal, the second control signal and the third control signal sequentially differ by a preset phase;
the first control signal controls the two power switch units of the first phase bridge arm to be alternately conducted, and the second control signal controls the two power switch units of the second phase bridge arm to be alternately conducted; and the third control signal controls the two power switch units of the third phase bridge arm to be alternately conducted so as to realize direct current charging or alternating current charging.
22. The apparatus of any one of claims 14 to 21, wherein the first energy transforming device comprises a first motor comprising a first motor coil; the second energy conversion device comprises a second electric machine comprising a second electric machine coil; the first motor and the second motor are both driving motors of the vehicle.
23. A vehicle characterized by comprising an apparatus for vehicle charging according to any one of claims 14 to 22.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024433A (en) * | 2015-09-01 | 2015-11-04 | 深圳市科华恒盛科技有限公司 | Charge power distribution system and method for dual-path charging |
| JP2015233356A (en) * | 2014-06-09 | 2015-12-24 | 日産自動車株式会社 | Power supply vehicle, charging system, and charging method |
| CN105946849A (en) * | 2016-06-27 | 2016-09-21 | 山东大学 | Topological structure and method for comprehensive transformation system of plug-in type hybrid electric vehicle |
| CN107017816A (en) * | 2017-04-25 | 2017-08-04 | 南京航空航天大学 | Electric automobile driving and charging system and failure reconfiguration method with fault-tolerant ability |
| CN107846055A (en) * | 2017-10-31 | 2018-03-27 | 华为技术有限公司 | The charge-discharge circuit and method of electric automobile |
| CN109747465A (en) * | 2019-02-13 | 2019-05-14 | 广州东方电科自动化有限公司 | A kind of electric bus rush-harvesting and rush-planting direct-current charging post power intelligent distribution system and method |
-
2019
- 2019-06-30 CN CN201910582153.4A patent/CN112224087B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015233356A (en) * | 2014-06-09 | 2015-12-24 | 日産自動車株式会社 | Power supply vehicle, charging system, and charging method |
| CN105024433A (en) * | 2015-09-01 | 2015-11-04 | 深圳市科华恒盛科技有限公司 | Charge power distribution system and method for dual-path charging |
| CN105946849A (en) * | 2016-06-27 | 2016-09-21 | 山东大学 | Topological structure and method for comprehensive transformation system of plug-in type hybrid electric vehicle |
| CN107017816A (en) * | 2017-04-25 | 2017-08-04 | 南京航空航天大学 | Electric automobile driving and charging system and failure reconfiguration method with fault-tolerant ability |
| CN107846055A (en) * | 2017-10-31 | 2018-03-27 | 华为技术有限公司 | The charge-discharge circuit and method of electric automobile |
| CN109747465A (en) * | 2019-02-13 | 2019-05-14 | 广州东方电科自动化有限公司 | A kind of electric bus rush-harvesting and rush-planting direct-current charging post power intelligent distribution system and method |
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