Method for increasing charging power by connecting multiple modules of motorcycle in parallel

Abstract

The invention discloses a method for increasing charging power by connecting multiple modules of a motorcycle in parallel. The method comprises the following steps that a whole vehicle charging seat is connected with a charging gun and receives CC and CP signals; the OBC connected with the charging gun wakes up preferentially and starts to judge CC and CP values of the gun, and the OBC is identified as a host OBC; after the host OBC and the charging gun complete handshake, the host OBC and the battery perform handshake; the slave OBC is awakened, and an OBC charging ID distribution process is entered; and the host OBC performs power distribution according to the power capability and the temperature rise of each OBC. The charging pile sends a PWM signal to the vehicle through the CP pin, the vehicle end determines the maximum charging current capable of being provided by the charging pile according to the duty ratio of the received PWM signal, and meanwhile, the vehicle feeds back state information of the vehicle to the charging pile through the CP line, so that coordinated control over the charging process is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of charging power supplies, and in particular to a method for increasing charging power by connecting multiple modules of a motorcycle in parallel. Background Art

[0002] Electric motorcycles need to charge the whole vehicle battery. As the vehicle's mileage increases, the battery will become larger and larger, and people need to charge faster and faster. At present, the whole vehicle charging method in the industry is basically to charge with a single charger or a single on-board OBC. As the charging power demand increases, the battery charging module is increased. However, the charger is often limited by size, heat dissipation, the current that the charging stand can withstand, and portability.

[0003] According to data, multiple charging modules in existing charging piles usually adopt the following methods when working normally. For example, in current balancing control, the host works in voltage stabilization mode and the slave works in current stabilization mode. When the output voltage of the slave fluctuates greatly in order to stabilize the current, it will cause the voltage on the output bus of the charging pile to fluctuate greatly; and the current regulation of the slave is based on the current output value of the host. When the current on the host fluctuates slightly, the output current of the slave will amplify the current fluctuation of the host by multiples, thereby worsening the current balancing control effect.

[0004] Chinese patent document CN113708458A discloses a "multi-charging module parallel current sharing control method, device and system". When the host and each slave in each charging module output in parallel, obtain the first output current feedback value of the host and the second output current feedback value of each slave; obtain the average current value of each charging module according to the first output current feedback value and each second output current feedback value; obtain the target voltage setting value and output voltage feedback value of each charging module; adjust the actual output current value of each charging module according to the difference between the average current value and the first output current feedback value or the average current value and the second output current feedback value, and according to the target voltage setting value and the output voltage feedback value. The above technical solution cannot realize the arbitrary selection of the host and charging can be achieved by the normal operation of any host. Summary of the invention

[0005] The present invention mainly solves the technical problem that the original technical solution cannot realize arbitrary selection of the host and charging can be realized when any host works normally. It provides a method for increasing the charging power by connecting multiple modules of a motorcycle in parallel. When the charging gun is inserted into the charging interface of the vehicle, the CC pin on the charging gun forms a loop with the detection circuit on the vehicle end. The vehicle determines the connection status by detecting the resistance value in this loop. The charging pile sends a PWM signal to the vehicle through the CP pin. The vehicle end determines the maximum charging current that the charging pile can provide according to the duty cycle of the received PWM signal. At the same time, the vehicle feeds back its own status information to the charging pile through the CP line to realize coordinated control of the charging process.

[0006] The above technical problem of the present invention is mainly solved by the following technical solution: The present invention comprises the following steps: S1 the vehicle charging seat is connected to the charging gun and receives CC and CP signals; S2 The OBC connected to the charging gun wakes up first and starts to judge the CC and CP values ​​of the gun, and identifies it as the host OBC; After the S3 host OBC has completed the handshake with the charging gun, it will shake hands with the battery; S4 wakes up the slave OBC and enters the OBC charging ID allocation process; The S5 host OBC distributes power according to the power capacity and temperature rise of each OBC.

[0007] Preferably, in step S1, a CC pin is provided on the charging gun, and a corresponding detection circuit is provided in the charging interface of the vehicle charging seat. When the charging gun is inserted into the vehicle charging interface, the CC pin forms a loop with the detection circuit on the vehicle end.

[0008] Preferably, the whole vehicle charging station receives a CC signal and determines the connection status by detecting the resistance value in this loop; the whole vehicle charging station receives a CP signal and communicates between the vehicle and the charging pile to control the charging parameters.

[0009] Preferably, the charging pile sends a PWM signal to the vehicle via the CP pin, and the vehicle determines the maximum charging current that the charging pile can provide based on the duty cycle of the received PWM signal.

[0010] Preferably, the step S2 specifically includes: the OBC connected to the CC and CP plug-ins in the vehicle charging seat actively wakes up through the external 12V power supply, synchronously starts to judge the CC and CP values ​​of the charging gun, and considers itself to be the host OBC.

[0011] Preferably, the step S3 specifically includes: after the host OBC completes the handshake with the charging gun, it then communicates with the battery, the host OBC uploads the charger message to the outside, and receives the request message from the BMS at the same time. Once the request message from the BMS is received, the host OBC starts to calculate the corresponding battery demand power.

[0012] Preferably, before the output contactor or MOS of the OBC is closed, the internal VOUT and the battery voltage are close to each other, so as to avoid the phenomenon that the battery discharge port charges the charger capacitor.

[0013] Preferably, the step S5 first determines the charging power by selecting the minimum value from the maximum power supported by the charging gun, the rated charging power of the OBC and the MAP of the battery.

[0014] Preferably, after the charging power is determined in step S5, the host OBC reads all OBC bus information and determines which OBCs within the operating temperature range are allowed to charge. If there is only one OBC allowed to work, it will work alone. If more than one OBC is allowed to work, the power of the OBCs allowed to work will be allocated according to the temperature rise to ensure consistent temperature rise.

[0015] Preferably, before the OBC outputs, the capacitor inside the OBC is fully charged to prevent the battery from discharging to the OBC.

[0016] The beneficial effect of the present invention is that when the charging gun is inserted into the vehicle charging interface, the CC pin on the charging gun forms a loop with the detection circuit on the vehicle side. The vehicle determines the connection status by detecting the resistance value in this loop. The charging pile sends a PWM signal to the vehicle through the CP pin. The vehicle side determines the maximum charging current that the charging pile can provide according to the duty cycle of the received PWM signal. At the same time, the vehicle feeds back its own status information to the charging pile through the CP line to realize coordinated control of the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the present invention.

[0018] Figure 2 This is an OBC power-on flow chart of the present invention.

[0019] Figure 3 It is an OBC authentication flow chart of the present invention.

[0020] Figure 4 It is a multi-OBC parallel flow chart of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the technical solutions of the present application are further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific implementation method described here is only an optimal embodiment of the present application, which is only used to explain the present application and does not limit the protection scope of the present application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] At present, the whole vehicle charging method in the industry is basically to charge with a single charger or a single on-board OBC. As the charging power demand increases, the battery charging module is increased. However, the charger is often limited by size, heat dissipation, the current that the charging stand can withstand, and portability.

[0023] For example: BMW's CE04 has a built-in integrated OBC 6.6KW. CFMOTO AE8 uses a portable 10A charger. Qianjiang's original OAO has a built-in 2KW OBC.

[0024] The main purpose of this application is to charge multiple modules (on-board chargers) simultaneously, ensuring the charging speed while taking into account the safety of various electrical appliances.

[0025] The main algorithms that have been added are: 1. The charging power MAP is calculated mainly based on the thermal model of the charging module, the AC load capacity of the charger, the maximum charging capacity of the vehicle line, and the charging MAP of the lithium battery.

[0026] 2. The charging power distribution model and constant current and voltage are mainly achieved through the CAN matrix, which can actively and senselessly identify the master and slave devices (charger ID allocation) and connect them in parallel.

[0027] 3. Vehicle thermal management Improved the following effects: The charger that can be shipped out of the factory is relatively small, and can be added if the customer needs it, allowing for flexible configuration.

[0028] Adding a standard charging module can reduce charging time.

[0029] If a single charging module fails, it can be replaced flexibly.

[0030] The whole vehicle is charged with an AC charging gun. There are more than two OBCs in the whole vehicle. The structure, interface, and software program of these two OBCs are the same. They are exactly the same thing. Two OBCs are installed on the whole vehicle. One OBC is connected to the CC and CP signals on the charging seat, and the interface of the other OBC is left unconnected. Both OBCs are connected to the CAN bus, and the two OBCs can communicate with each other through CAN.

[0031] Step 1: The vehicle charging station is connected to the charging gun.

[0032] Step 2: The vehicle receives the CC and CP signals, and OBC1 (the one connected to the CCCP plug-in) is activated. Through the external 12V power supply, OBC can easily wake up actively and start to judge the CC and CP values ​​of the gun synchronously, and think that it is the host.

[0033] Step 3: After the handshake between the host and the gun is completed, the OBC (host) will communicate with the battery in the next step. The host uploads the charger message to the outside and receives the request message from the BMS at the same time. Once the request message from the BMS is received, the OBC starts to calculate the corresponding battery demand power.

[0034] Step 4: The host has completed handshakes with the gun and the battery. At this time, the charging port has an AC point and all slaves have been awakened. At this time, the charger ID allocation process begins. It is better to make the cable as simple as possible and the charger reusable. OBC needs to know the corresponding CANID before each power-on.

[0035] Step 5: The host distributes power according to the power capacity and temperature rise of each OBC, allowing the chargers to output the most appropriate power for each and perform thermal management calculations for the entire vehicle.

[0036] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations (or steps) as sequential processes, many of the operations (or steps) therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the drawings; the process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0037] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0038] Embodiment: A method for increasing charging power by connecting multiple modules of a motorcycle in parallel in this embodiment, such as Figure 1 As shown, the following steps are included: The S1 vehicle charging station is connected to the charging gun and receives CC and CP signals. The charging gun is provided with a CC pin, and the charging interface of the vehicle charging station has a corresponding detection circuit. When the charging gun is inserted into the vehicle charging interface, the CC pin forms a loop with the detection circuit on the vehicle side.

[0039] The vehicle charging station receives the CC signal and determines the connection status by detecting the resistance value in this loop; the vehicle charging station receives the CP signal and communicates between the vehicle and the charging pile to control the charging parameters.

[0040] The charging pile sends a PWM signal to the vehicle through the CP pin, and the vehicle determines the maximum charging current that the charging pile can provide based on the duty cycle of the received PWM signal.

[0041] S2 The OBC connected to the charging gun wakes up first and starts to judge the CC and CP values ​​of the gun, and is identified as the host OBC. Specifically, the OBC connected to the CC and CP plug-in in the vehicle charging seat actively wakes up first through the external 12V power supply, and starts to judge the CC and CP values ​​of the charging gun synchronously, and considers itself to be the host OBC.

[0042] The vehicle is charged with an AC charging gun. There are more than two OBCs in the vehicle. The structures, interfaces, and software programs of these two OBCs are the same. They are exactly the same thing. Two OBCs are installed on the vehicle. One OBC is connected to the CC and CP signals on the charging seat, and the interface of the other OBC is left hanging. Both OBCs are connected to the CAN bus, and the two OBCs can communicate with each other. At present, there are only two OBCs in the vehicle, and the master and slave can be directly confirmed. If there are three OBCs in the vehicle, the OBCs need to be assigned IDs first so that they can have corresponding CAN IDs.

[0043] After the S3 host OBC completes the handshake with the charging gun, it will shake hands with the battery. After the host OBC completes the handshake with the charging gun, it will communicate with the battery. The host OBC uploads the charger message to the outside and receives the request message from the BMS at the same time. Once the request message from the BMS is received, the host OBC starts to calculate the corresponding battery demand power. Before the output contactor or MOS of the OBC is closed, the internal VOUT and battery voltage are close. Be sure to avoid the phenomenon of the battery discharge port charging the charger capacitor.

[0044] S4 wakes up the slave OBC and enters the OBC charging ID allocation process. The host OBC has completed handshakes with the charging gun and the battery. At this time, the charging port already has an AC point and all slave OBCs have been awakened. At this time, the OBC charger ID allocation process is entered. It is better to make the cable as simple as possible and the OBC charger can be reused. The OBC needs to know the corresponding CANID before each power-on.

[0045] The S5 host OBC distributes power according to the power capacity and temperature rise of each OBC. First, the minimum value is selected from the maximum power supported by the charging gun, the rated charging power of the OBC, and the MAP of the battery to determine the charging power. After determining the charging power, the host OBC reads all OBC bus information and determines whether the OBCs within the operating temperature range are allowed to charge. If there is only one OBC allowed to work, it will work alone. If more than one OBC is allowed to work, the OBCs allowed to work will be allocated power according to the temperature rise to ensure consistent temperature rise. Before the OBC outputs, the capacitor inside the OBC is fully charged to prevent the battery from discharging the OBC.

[0046] In the AC charging process of electric vehicles, CC (Charging Connection Confirmation) and CP (Control Confirmation) signals play a key role. The following is a related introduction, but it should be noted that they are not obtained through calculation, but based on the design of charging protocol and hardware circuit to realize the judgment of their function and status: CC (Charging Connection Confirmation) is mainly used to confirm whether the physical connection between the charging gun and the vehicle charging port is normal.

[0047] Principle and related circuits There is usually a CC pin on the charging gun, and a corresponding detection circuit in the vehicle charging port. When the charging gun is plugged into the vehicle charging port, the CC pin forms a loop with the detection circuit on the vehicle side.

[0048] The vehicle determines the connection status by detecting the resistance value in this loop. For example, in some standards, if the detected resistance value is within the specified range (such as 1kΩ±5% in some standards), the charging connection is considered normal. CC is the current value obtained by looking up the table.

[0049] CP (Control Confirmation) is used to communicate between the vehicle and the charging pile to control parameters such as charging power.

[0050] Principle and related circuits The charging pile sends a PWM (pulse width modulation) signal to the vehicle through the CP pin.

[0051] First, the vehicle determines the maximum charging current that the charging pile can provide based on the duty cycle of the received PWM signal. For example, a duty cycle of 20% may correspond to a maximum charging current of 8A, and a duty cycle of 50% may correspond to a maximum charging current of 16A, etc. (the specific correspondence is specified by the charging protocol). At the same time, the vehicle can also feedback its own status information to the charging pile through the CP line to achieve coordinated control of the charging process.

[0052] The second is the rated charging power of the OBC, and the third is the battery charging MAP. The charging power is the minimum of the three (maximum power supported by the gun), (rated charging power of the OBC), and (MAP of the battery).

[0053] Current status of two-wheeler charging: 1. Two-wheeled vehicles are reviewing better platforms, more cost-effective new energy platforms. The more concentrated space in the vehicle is basically used for lithium battery layout, leaving more scattered space.

[0054] 2. The biggest problem that semiconductors need to solve is heat. Under the same voltage, the increase in power and the heat generated by the current increase exponentially. Separating the components will be beneficial to the heat dissipation of the entire vehicle and increase the heat dissipation surface area.

[0055] 3. Multiple modules are compatible, the modules support master-slave replacement, and a single part status. Increasing its degree of standardization can reduce the cost of vehicle parts and maintenance costs.

[0056] Example The Qianjiang 7000D project used this application solution and installed OBCs on the left and right sides of the battery.

[0057] Specific method of using the whole vehicle: Step 1: The 12V of the OBC host is always on, the charging gun is plugged into the charging socket of the whole vehicle, the OBC detects the CC signal, the OBC turns on the CP switch to activate the charging gun, and the charging gun outputs AC power.

[0058] At this time, all OBCs on the link have been activated. Currently, there are only two OBCs in the vehicle, and the master and slave can be directly confirmed. If there are three OBCs in the vehicle, the OBCs need to be assigned IDs first so that they can have corresponding CAN IDs.

[0059] Step 2: The ID allocation process is as follows Figure 2 , Figure 3 As shown in the figure, the process and message implementation of the charger power-on ID allocation.

[0060] Table 1 Charger power-on ID allocation message table Step 3: Both the master and slave have private IDs, and then start charging map calculation and other preparations.

[0061] The OBC host calculates the current for the power of the corresponding gun according to the battery request report and the CC signal of the grab seat. The calculated message current is shown in the following message content.

[0062] The process and message implementation of multiple chargers in parallel charging are as follows: Figure 4 shown.

[0063] Table 2 Charger multi-machine parallel charging message table The process and message implementation during battery charging are as follows: Figure 1 shown.

[0064] Table 3 Battery charging message table 1. The charger OBC needs to read the message of 204. The charger only needs to identify the charging stop flag 204Byte[0]Bit[1] and 204Byte[0]Bit[2]. The voltage and current can be executed according to the requested voltage and current of 280. 2. When the charger OBC receives the full flag, it stops sending messages and turns the full state green (there is only one condition for the charger to stop sending messages: when the full flag is received); 3. Definition of light display: Standby state: green light flashes (AC is plugged in, the charger has a message, no battery message is received, and the charger cannot read 204 or 280 in 10S, then it is considered that the battery is not there); No-load state: red and green flashing (charger has message, battery has message, but battery voltage is not detected); Charging status: red light flashes; Fault status: The red light is always on (output undervoltage, output short circuit, output reverse connection, charging timeout); 4. The charger OBC stops sending 401.402 to cut off the output only when it recognizes the full flag bit 204 or the charging stop flag bit. It will not stop sending 401.402 at any other time. If it cannot read the requested voltage and current 280, it can cut off the output and resume when it receives the requested voltage and current again. The specific embodiments described herein are merely examples of the spirit of the present invention. The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that a technician in the technical field to which the present application belongs may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but will not deviate from the spirit of the present application or exceed the scope defined in the attached claims. For a person of ordinary skill in the art, multiple variations and improvements may also be made without departing from the concept of the present application. Therefore, the scope of protection of this patent shall be subject to the attached claims.

Claims

1. A method for increasing charging power by connecting multiple modules in parallel on a motorcycle, characterized in that: The following steps are involved: S1. The vehicle charging station is connected to the charging gun and receives CC and CP signals; S2. The OBC connected to the charging gun wakes up first and starts to determine the CC and CP values ​​of the gun, and identifies it as the host OBC; S3. After the host OBC shakes hands with the charging gun, it shakes hands with the battery; S4. Wake up the slave OBC and enter the OBC charging ID allocation process; S5. The host OBC distributes power according to the power capacity and temperature rise of each OBC.

2. The method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1, characterized in that: In step S1, a CC pin is provided on the charging gun, and a corresponding detection circuit is provided in the charging interface of the vehicle charging seat. When the charging gun is inserted into the vehicle charging interface, the CC pin forms a loop with the detection circuit on the vehicle end.

3. A method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1 or 2, characterized in that: The whole vehicle charging seat receives the CC signal and determines the connection status by detecting the resistance value in this loop; the whole vehicle charging seat receives the CP signal and communicates between the vehicle and the charging pile to control the charging parameters.

4. The method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1, characterized in that: The charging pile sends a PWM signal to the vehicle via the CP pin, and the vehicle determines the maximum charging current that the charging pile can provide based on the duty cycle of the received PWM signal.

5. The method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1, characterized in that: The step S2 specifically includes: the OBC connected to the CC and CP plug-ins in the vehicle charging seat actively wakes up first through the external 12V power supply, synchronously starts to judge the CC and CP values ​​of the charging gun, and considers itself to be the host OBC.

6. The method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1, characterized in that: The step S3 specifically includes that after the host OBC completes the handshake with the charging gun, it then communicates with the battery, the host OBC uploads the charger message to the outside, and receives the request message from the BMS at the same time. Once the request message from the BMS is received, the host OBC starts to calculate the corresponding battery demand power.

7. A method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1 or 6, characterized in that: Before the output contactor or MOS of the OBC is closed, the internal VOUT and battery voltage are close to each other.

8. The method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1, characterized in that: The step S5 first determines the charging power by selecting the minimum value from the maximum power supported by the charging gun, the rated charging power of the OBC and the MAP of the battery.

9. The method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 8, characterized in that: After the charging power is determined in step S5, the host OBC reads all OBC bus information and determines which OBCs within the operating temperature range are allowed to charge. If there is only one OBC allowed to work, it will work alone. If there are more than one OBC allowed to work, the power of the OBCs allowed to work will be allocated according to the temperature rise to ensure consistent temperature rise.

10. A method for increasing charging power by connecting multiple modules in parallel on a motorcycle according to claim 1 or 8, characterized in that: Before the OBC outputs, the capacitor inside the OBC is fully charged to prevent the battery from discharging to the OBC.

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