Charging system for realizing sequential direct current fast charging and control method

Abstract

The invention discloses a charging system and a control method for realizing sequential direct-current fast charging, and the method specifically comprises the following steps: S1, each vehicle is provided with two direct-current charging seats, and related signal lines are communicated; and S2, the vehicle control unit VBU can detect communication between S + S-and the charging pile in real time and can also monitor an A + fast charging wake-up signal of the charging pile in real time, a relay is arranged on an A + wake-up signal line, and the VBU on each vehicle can turn off and turn on the relay according to the actual situation so as to perform information interaction with the next vehicle. According to the system and method, vehicles can be intelligently and sequentially charged without being guarded by a specially-assigned person, the uncomfortable and unhumanized charging experience caused by the fact that the vehicles need to be guarded by the specially-assigned person and stay up in the later midnight is solved, meanwhile, seamless connection can be achieved for charging, the charging time is shortened, the input of the number of direct-current charging piles can be indirectly reduced, and the charging efficiency is improved. The economic benefit is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles. Specifically, the present invention relates to a charging system and a control method for realizing sequential direct current fast charging. Background Art

[0002] The problem of electric vehicle charging is an important issue and difficulty in the popularization of electric vehicles. Many people are deterred from buying electric vehicles because of the inconvenience of charging.

[0003] DC fast charging is the choice of many people because of its fast charging speed. Basically, it can be fully charged in 0.5-1.5 hours, which is popular with many people.

[0004] Many logistics fleets, after completing freight transportation, will drive their high-capacity electric vehicles to fixed gathering points for charging. During charging, they need to be supervised by a dedicated person. After one vehicle is fully charged, they need to unload the gun and move it to another vehicle, which wastes people's time and energy. They need to be supervised and handled by a dedicated person. Especially when electricity prices fluctuate, the fleet owners will use the second half of the night to charge the vehicles, when the electricity prices are much cheaper. At this time, the dedicated charging caregivers need to stay up all night to handle the situation. Moreover, when there are more vehicles, multiple charging piles need to be arranged for charging, and vehicle movement operations need to be performed at the same time.

[0005] To this end, a system and method are invented that can charge vehicles in an intelligent and sequential manner without the need for special supervision, thereby resolving the uncomfortable and inhumane charging experience that requires special supervision and requires staying up late at night. Summary of the invention

[0006] The present invention provides a charging system and a control method for realizing sequential DC fast charging, which solves the problem of requiring special personnel to supervise and staying up late at night, resulting in an uncomfortable and inhuman charging experience. At the same time, charging can be seamlessly connected, shortening the charging time, indirectly reducing the investment in the number of DC charging piles, and increasing economic benefits.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a charging system and control method for realizing sequential DC fast charging, which specifically includes the following steps:

[0008] Step S1, each vehicle is equipped with two DC charging sockets, and the relevant signal lines are connected;

[0009] Step S2, the vehicle controller VBU can detect the communication between S+S- and the charging pile in real time, and can also monitor the A+ fast charging wake-up signal of the charging pile in real time. There is a relay on the A+ wake-up signal line. The VBU on each vehicle will close and open the relay according to the actual situation to interact with the next vehicle; CC2 fast charging connection signal, indicating whether the fast charging gun is connected;

[0010] Step S3, two temperature sensors are arranged in the fast charging base, and the VBU detects the temperature signal of the charging base in real time;

[0011] Step S4: Before charging, the operator needs to stop the vehicle and connect the vehicles to be charged in turn using the charging guns, and ensure that the charging guns are fully connected;

[0012] Step S5, operate the charging pile to charge. At this time, the charging pile and the first charging vehicle exchange signals normally. The fast charging pile will output a 12V wake-up signal at A-A+. After the vehicle controller VBU wakes up and works normally, it will cooperate with the charging pile to guide the charging process.

[0013] Step S6, when the first vehicle is fully charged, the VBU will send a BST message to the charging pile to end charging. In the first vehicle, the VBU will control the vehicle to disconnect the corresponding high-voltage contactor and no longer allow the motor in its own vehicle to continue charging. At this time, the vehicle is fully charged.

[0014] Preferably, in step S6, when the VBU sends the BST message, a signal is added to the message signal, indicating that the reason why the VBU terminates charging is that the target power state has been reached and the subsequent vehicle still needs charging demand = 1; after receiving this signal, the charging pile will continue to send the A+A- wake-up signal and will not sleep immediately after charging is completed.

[0015] Preferably, in step S6, after the VBU controls the whole vehicle to lower the high voltage, it will close the relay on the A+ line to keep it in a closed state, so that the A+ signal can be transmitted to the subsequent charging vehicle.

[0016] Preferably, the subsequent vehicle to be charged will wake up the vehicle controller VBU due to the input of the A+ signal, and will thus perform the normal charging process like the first vehicle, and the same process steps S1-S6 will be executed accordingly; in this way, multiple vehicles can be charged sequentially on one charging pile without the need for dedicated personnel to supervise and charge the vehicle.

[0017] Preferably, during the entire charging process, in order to monitor the safety of the charging station and prevent overtemperature from causing a fire accident, the VBU of the entire vehicle will not go into sleep mode after the first vehicle is charged, and will always monitor the signal of the temperature sensor on its own vehicle in real time.

[0018] The beneficial effects of adopting the above technical solution are:

[0019] The present invention is a system and method that can charge vehicles in an intelligent order without the need for special personnel to supervise, thereby resolving the problem of charging experience that requires special personnel to supervise and has to stay up late at night, resulting in an uncomfortable and inhumane charging experience. At the same time, charging can be performed seamlessly, shortening the charging time, and indirectly reducing the investment in the number of DC charging piles, thereby increasing economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the charging system of the present invention;

[0021] Figure 2 This is a structural view of the present invention. DETAILED DESCRIPTION

[0022] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0023] like Figure 1 to Figure 2 As shown, the present invention is a charging system and control method for realizing sequential DC fast charging.

[0024] Specifically, Figure 1 to Figure 2 As shown, the specific steps include:

[0025] Step S1, each vehicle is equipped with two DC charging sockets, and the relevant signal lines are connected;

[0026] Step S2, the vehicle controller VBU can detect the communication between S+S- and the charging pile in real time, and can also monitor the A+ fast charging wake-up signal of the charging pile in real time. There is a relay on the A+ wake-up signal line. The VBU on each vehicle will close and open the relay according to the actual situation to interact with the next vehicle; CC2 fast charging connection signal, indicating whether the fast charging gun is connected;

[0027] Step S3, two temperature sensors are arranged in the fast charging base, and the VBU detects the temperature signal of the charging base in real time;

[0028] Step S4: Before charging, the operator needs to stop the vehicle and connect the vehicles to be charged in turn using the charging guns, and ensure that the charging guns are fully connected;

[0029] Step S5, operate the charging pile to charge. At this time, the charging pile and the first charging vehicle exchange signals normally. The fast charging pile will output a 12V wake-up signal at A-A+. After the vehicle controller VBU wakes up and works normally, it will cooperate with the charging pile to guide the charging process.

[0030] Step S6, when the first vehicle is fully charged, the VBU will send a BST message to the charging pile to end charging. In the first vehicle, the VBU will control the vehicle to disconnect the corresponding high-voltage contactor and no longer allow the motor in its own vehicle to continue charging. At this time, the vehicle is fully charged.

[0031] In step S6, when the VBU sends the BST message, a signal is added to the message signal that the reason for VBU terminating charging is that the target power state has been reached and the subsequent vehicle still needs to be charged. After receiving this signal, the charging pile will continue to send the A+A- wake-up signal and will not sleep immediately after charging.

[0032] In step S6, after the VBU controls the whole vehicle to lower the high voltage, it will close the relay on the A+ line to keep it in a closed state so that the A+ signal can be transmitted to the subsequent charging vehicle.

[0033] The subsequent vehicles to be charged will wake up the vehicle controller VBU due to the input of the A+ signal, and will then go through the normal charging process like the first vehicle, with the same process steps S1-S6 being executed accordingly; in this way, multiple vehicles can be charged sequentially on one charging pile without the need for dedicated personnel to supervise and handle operations such as charging guns.

[0034] During the entire charging process, in order to monitor the safety of the charging station and prevent over-temperature from causing fire accidents, the VBU of the entire vehicle will not go into sleep mode after the first vehicle is charged, and will continue to monitor the signal of the temperature sensor on its own vehicle in real time.

[0035] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above-mentioned concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A charging system and control method for realizing sequential DC fast charging, characterized in that: The specific steps include: Step S1, each vehicle is equipped with two DC charging sockets, and the relevant signal lines are connected; Step S2, the vehicle controller VBU can detect the communication between S+S- and the charging pile in real time, and can also monitor the A+ fast charging wake-up signal of the charging pile in real time. There is a relay on the A+ wake-up signal line. The VBU on each vehicle will close and open the relay according to the actual situation to interact with the next vehicle; CC2 fast charging connection signal, indicating whether the fast charging gun is connected; Step S3, two temperature sensors are arranged in the fast charging base, and the VBU detects the temperature signal of the charging base in real time; Step S4: Before charging, the operator needs to stop the vehicle and connect the vehicles to be charged in turn using the charging guns, and ensure that the charging guns are fully connected; Step S5, operate the charging pile to charge. At this time, the charging pile and the first charging vehicle exchange signals normally. The fast charging pile will output a 12V wake-up signal at A-A+. After the vehicle controller VBU wakes up and works normally, it will cooperate with the charging pile to guide the charging process. Step S6, when the first vehicle is fully charged, the VBU will send a BST message to the charging pile to end charging. In the first vehicle, the VBU will control the vehicle to disconnect the corresponding high-voltage contactor and no longer allow the motor in its own vehicle to continue charging. At this time, the vehicle is fully charged.

2. A charging system and control method for realizing sequential DC fast charging according to claim 1, characterized in that: In step S6, when the VBU sends the BST message, a signal is added to the message signal, indicating that the reason for VBU terminating charging is that the target power state has been reached and the subsequent vehicle still needs charging demand = 1; after receiving this signal, the charging pile will continue to send the A+A- wake-up signal and will not sleep immediately after charging is completed.

3. A charging system and control method for realizing sequential DC fast charging according to claim 1, characterized in that: In step S6, after the VBU controls the whole vehicle to lower the high voltage, it will close the relay on the A+ line to keep it in a closed state so that the A+ signal can be transmitted to the subsequent charging vehicle.

4. A charging system and control method for realizing sequential DC fast charging according to claim 3, characterized in that: The subsequent vehicle to be charged will wake up the vehicle controller VBU due to the input of the A+ signal, and will then carry out the normal charging process like the first vehicle, and the same process steps S1-S6 will be executed accordingly; in this way, multiple vehicles can be charged sequentially on one charging pile without the need for dedicated personnel to supervise and handle operations such as charging.

5. A charging system and control method for realizing sequential DC fast charging according to claim 1, characterized in that: During the entire charging process, in order to monitor the safety of the charging station and prevent over-temperature from causing fire accidents, the VBU of the entire vehicle will not go into sleep mode after the first vehicle is charged, and will always monitor the signal of the temperature sensor on its own vehicle in real time.

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