Passenger car charging system and control method thereof

Abstract

The invention discloses a passenger car charging system and a control method thereof.According to the system, through an intelligent charging control module independent of a passenger car main power source loop, the charging process is automatically awakened after a charging gun is inserted, a mechanical power source main switch does not need to be turned on, and meanwhile through combination of a remote communication module and a mobile terminal APP, the charging process is automatically awakened; a user is supported to remotely initiate charging, stop charging, inquire the charging state and set charging parameters. The technical problems that a mechanical power supply main switch needs to be turned on for charging a traditional passenger car, operation is tedious and remote control cannot be achieved are solved.

Description

Technical Field

[0001] This invention belongs to the field of bus charging technology, specifically relating to a bus charging system and a control method for the bus charging system. Background Technology

[0002] With the rapid development of the new energy vehicle industry, pure electric buses and hybrid buses have become an important part of urban public transportation. As a core supporting facility for new energy buses, the convenience and safety of the charging system directly affect the operating efficiency and user experience of the buses.

[0003] However, traditional bus charging systems generally have the following problems: 1. Cumbersome operation: Before charging, the main mechanical power switch of the bus needs to be turned on manually. Only after the vehicle control system is powered on can the charging gun be connected and the charging operation be carried out. After charging is completed, the main mechanical power switch needs to be turned off again to shut down the relevant systems, which increases the workload of drivers or maintenance personnel. Especially in the scenario of large-scale fleet maintenance, the efficiency is low.

[0004] Second, lack of remote control capability: It is impossible to monitor the charging status in real time through remote terminals, nor can the charging process be initiated or stopped remotely; when the vehicle has a charging failure or needs to stop charging in an emergency, staff need to operate on-site, which delays the opportunity to handle the failure and makes it difficult to achieve intelligent management of charging scheduling.

[0005] Third, insufficient safety: Traditional charging systems rely on a mechanical main power switch to control the on / off of the main circuit. If the switch malfunctions mechanically or has poor contact, the charging circuit may not be able to be connected or disconnected normally, posing safety hazards such as overload and short circuit. At the same time, if a misoperation occurs during manual operation, it may also cause a safety accident. Summary of the Invention

[0006] The purpose of this invention is to provide a bus charging system and its control method, which solves the problems of cumbersome operation, lack of remote control capability, and insufficient safety of traditional bus charging.

[0007] The technical solution adopted in this invention is a bus charging system, comprising: The charging interface module includes a charging gun socket and a gun insertion detection unit. After an external charging gun is connected to the charging gun socket, the gun insertion detection unit generates a gun insertion trigger signal and sends it to the charging control module to wake up the system and enter the charging preparation state. The remote communication module establishes a two-way communication link between the charging control module and the mobile terminal APP, used to transmit remote control commands and charging status information. The status detection module is used to detect the real-time status of the charging circuit and transmit the detection data to the charging control module in real time. The mobile terminal APP is installed on the user's electronic device, providing a visual operation interface and having fault alarm push function; The charging control module is used to receive the charging gun insertion signal from the charging interface module, the parameter signal from the status detection module, and the control command from the remote communication module, and output the charging control signal to the charging circuit to realize the automatic control of the charging process. The energy storage module provides independent power to the charging control module, charging interface module, and remote communication module.

[0008] Furthermore, it also includes a safety protection module, which is electrically connected to the charging control module. When the status detection module detects abnormal parameters, the charging control module triggers the safety protection module to cut off the charging circuit and send a fault alarm signal to the mobile terminal APP through the remote communication module.

[0009] Furthermore, the aforementioned plug-in detection unit has a built-in Hall sensor or mechanical contact switch that generates a plug-in trigger signal when the charging gun is inserted.

[0010] Furthermore, the aforementioned status detection module includes a voltage sensor, a current sensor, a temperature sensor, and an insulation detection unit; these are used to detect the voltage and current of the charging circuit, the temperature of the charging interface and battery pack, and the insulation resistance value of the charging circuit, respectively.

[0011] Furthermore, the aforementioned mobile terminal APP supports user registration and login, binding of vehicles via vehicle VIN code or device number, initiation of remote charging / stop commands, viewing of real-time charging parameters and historical charging records, and sending alarm information to users in case of overvoltage, overcurrent, or overtemperature.

[0012] A control method for a bus charging system, the method including a local plug-in charging control process, the specific steps of which are as follows: 1) System wake-up: When an external charging gun is inserted into the charging gun socket, the insertion detection unit generates an insertion trigger signal and sends it to the charging control module; after receiving the signal, the charging control module wakes up from the sleep state and enters the charging preparation mode. 2) Parameter detection and verification: The charging control module starts the status detection module to perform initial detection on the charging circuit voltage, current, insulation resistance and charging interface temperature; if the detected parameters all meet the safety threshold, proceed to the next step; if the parameters are abnormal, an abnormal prompt signal is generated and charging is prohibited. 3) Charging circuit activation: The charging control module sends an activation command to the relay of the charging circuit to close the main charging circuit; at the same time, it automatically matches the charging current according to the current SOC (State of Charge) value of the bus battery pack. 4) Charging process monitoring: During the charging process, the status detection module collects charging parameters in real time and transmits them to the charging control module; the charging control module analyzes the parameters in real time, and if overvoltage, overcurrent, overtemperature or insulation fault occurs, it immediately sends a command to cut off the charging circuit, stop charging, and alarm through indicator lights or remote communication module. 5) Charging complete: When the battery pack SOC reaches 100%, or the status detection module detects that the battery pack is fully charged, the charging control module sends a command to cut off the charging circuit and complete the charging; at the same time, a charging complete notification is sent to the mobile terminal APP through the remote communication module.

[0013] Furthermore, when the charging circuit is turned on and the charging current is automatically matched, if the SOC is ≤20%, a 0.5C high-current fast charge is used; if the SOC is ≥80%, it switches to a 0.2C low-current slow charge.

[0014] Furthermore, the method also includes a remote APP charging control process, specifically comprising the following steps: 1) Command Initiation: After logging into their account and binding the target bus via the mobile terminal APP, the user clicks the "Start Charging" or "Stop Charging" button on the APP interface to generate a remote control command; the command is encrypted and then transmitted to the remote communication module. 2) Command Reception and Verification: After receiving the control command, the remote communication module transmits it to the charging control module. The charging control module verifies the legality of the command. If the verification is successful, it proceeds to the next step; if the verification fails, it sends an "invalid command" message to the APP. 3) Charging control execution: If the command is "Start charging": the charging control module executes steps 2-4 in the local plug-in charging control process, starts charging and provides real-time status feedback; if the command is "Stop charging": the charging control module immediately sends a command to cut off the charging circuit, stops charging, and sends a "Charging has stopped" notification to the APP.

[0015] Furthermore, during the charging process, the charging control module transmits real-time charging parameters—voltage, current, SOC, and remaining time—to the mobile terminal APP via the remote communication module, which is then displayed in real time on the APP interface. Users can check the charging status or adjust the charging parameters at any time through the APP.

[0016] Compared with existing technologies, the beneficial effects of this invention are that the system of this invention, through a charging control module independent of the main power circuit of the bus, realizes the automatic start of the charging process after the charging gun is inserted, without the need to turn on the mechanical main power switch; at the same time, combined with a remote communication module and a mobile terminal APP, it supports users to remotely initiate charging, stop charging, query charging status and set charging parameters. This invention simplifies the bus charging operation process, improves charging convenience and safety, is applicable to various pure electric and hybrid buses, and has broad application value. Attached Figure Description

[0017] Figure 1 This is a block diagram of the system structure of the present invention; Figure 2 Flowchart for local plug-in charging control; Figure 3 Flowchart for remote APP charging control. Detailed Implementation

[0018] The present invention will be further explained and described below with reference to the accompanying drawings to enable those skilled in the art to better understand it. Example

[0019] A bus charging system includes a charging interface module, a remote communication module, a status detection module, a mobile terminal APP, a charging control module, and a safety protection module.

[0020] The charging interface module includes a charging gun socket and a charging gun detection unit. The charging gun socket is used to connect an external charging gun. The charging gun detection unit has a built-in Hall sensor or mechanical contact switch. When the charging gun is inserted, it generates a charging gun trigger signal and sends it to the intelligent charging control module to wake up the system and enter the charging preparation state. The remote communication module, model SIM7600CE, supports all networks, with a communication rate of ≥1Mbps. It adopts 4G / 5G or WiFi communication protocols to establish a two-way communication link between the intelligent charging control module and the mobile terminal APP. It is used to transmit remote control commands (such as start charging, stop charging, adjust charging current) and charging status information (such as charging voltage, charging current, and remaining charging time). The status detection module includes a voltage sensor (range 0-1000V, accuracy ±0.2%), a current sensor (range 0-500A, accuracy ±0.3%), a temperature sensor (range -40℃-125℃, accuracy ±0.5℃), and an insulation detection unit (detection range 0-1000MΩ). These are used to detect the voltage and current of the charging circuit, the temperature of the charging interface and battery pack, and the insulation resistance value of the charging circuit, respectively. The detection data is transmitted in real time to the intelligent charging control module for safety protection and status monitoring. The mobile terminal APP is installed on users' mobile phones or tablets and other electronic devices, providing a visual operation interface; it supports user registration and login, binding vehicles by vehicle VIN code or device number, initiating remote charging / stop commands, viewing real-time charging parameters and historical charging records, and also has a fault alarm push function, such as sending alarm information to users when there is overvoltage, overcurrent, or overtemperature. The charging control module uses an STM32F4 series microcontroller with a main frequency of 168MHz. It supports multi-channel analog signal acquisition and digital signal output. It is used to receive the charging gun signal from the charging interface module, the parameter signal from the status detection module, and the control command from the remote communication module. It outputs the charging control signal to the charging circuit to realize the automatic control of the charging process. It is independent of the main power circuit of the bus and has no electrical connection with the main mechanical power switch of the bus.

[0021] The energy storage module uses a 2.7V / 50F supercapacitor, which can meet the system's continuous operation for 72 hours, or serve as a backup lithium battery. It provides independent power to the charging control module, charging interface module, and remote communication module, without relying on the bus's main battery or mechanical power switch, ensuring that the system can still work normally when the bus is powered off.

[0022] The safety protection module is electrically connected to the charging control module. When the status detection module detects abnormal parameters, such as voltage exceeding 110% of the rated value, current exceeding 120% of the rated value, temperature exceeding 85℃, or insulation resistance below 500Ω / V, the charging control module triggers the safety protection module, cuts off the charging circuit, and sends a fault alarm signal to the mobile terminal APP through the remote communication module.

[0023] A control method for a bus charging system includes a local plug-in charging control process and a remote APP charging control process. The specific steps of the local plug-in charging control process are as follows: 1) System wake-up: When an external charging gun is inserted into the charging gun socket, the insertion detection unit generates an insertion trigger signal and sends it to the charging control module; after receiving the signal, the charging control module wakes up from the sleep state and enters the charging preparation mode. 2) Parameter detection and verification: The charging control module starts the status detection module to perform initial detection on the charging circuit voltage, current, insulation resistance, and charging interface temperature. If all detected parameters meet the safety thresholds, the status detection module detects an insulation resistance of 800Ω / V and a temperature of 25℃, indicating that the parameters are normal, and the charging circuit is closed. If the parameters are abnormal, an abnormality prompt signal is generated, and charging is prohibited. 3) Charging circuit activation: The charging control module sends an activation command to the relay in the charging circuit to close the main charging circuit; at the same time, it automatically matches the charging current according to the current SOC (State of Charge) value of the bus battery pack. If SOC ≤ 20%, it uses 0.5C (200A) high-current fast charging; if SOC ≥ 80%, it switches to 0.2C (80A) low-current slow charging; after SOC reaches 100%, the circuit is disconnected. 4) Charging process monitoring: During the charging process, the status detection module collects charging parameters in real time and transmits them to the charging control module; the charging control module analyzes the parameters in real time, and if overvoltage, overcurrent, overtemperature or insulation fault occurs, it immediately sends a command to cut off the charging circuit, stop charging, and alarm through indicator lights or remote communication module. 5) Charging complete: When the battery pack SOC reaches 100%, or the status detection module detects that the battery pack is fully charged, the charging control module sends a command to cut off the charging circuit and complete the charging; at the same time, a charging complete notification is sent to the mobile terminal APP through the remote communication module.

[0024] The remote APP charging control process specifically includes the following steps: 1) Command Initiation: After logging into their account and binding the target bus via the mobile terminal APP, the user clicks the "Start Charging" or "Stop Charging" button on the APP interface to generate a remote control command; the command is encrypted and then transmitted to the remote communication module. 2) Command Reception and Verification: After receiving the control command, the remote communication module transmits it to the charging control module. The charging control module verifies the legality of the command. If the verification is successful, it proceeds to the next step; if the verification fails, it sends an "invalid command" message to the APP. 3) Charging control execution: If the command is "Start charging": the charging control module executes steps 2-4 in the local plug-in charging control process, starts charging and provides real-time status feedback; if the command is "Stop charging": the charging control module immediately sends a command to cut off the charging circuit, stops charging, and sends a "Charging has stopped" notification to the APP.

[0025] During charging, the charging control module transmits real-time charging parameters—voltage, current, SOC, and remaining time—to the mobile terminal APP via the remote communication module. For example, it displays a voltage of 540V, a current of 80A, an SOC of 85%, and a remaining time of 30 minutes. These parameters are then displayed in real-time on the APP interface. Users can check the charging status or adjust the charging parameters at any time through the APP. When the user clicks "Stop Charging," the system immediately cuts off the circuit, and the APP displays "Charging has stopped."

[0026] The above-mentioned charging control system was used in the charging system of urban buses, and safety tests were conducted on the system. Overcurrent test: The artificially simulated charging current reaches 550A (110% of the rated value of 500A). After the status detection module detects the abnormality, the intelligent charging control module cuts off the circuit within 0.1 seconds, and the APP receives an overcurrent alarm.

[0027] Over-temperature test: Heat the charging interface to 90℃. After the temperature sensor sends a signal, the system immediately stops charging, the indicator light flashes and an alarm is triggered, and the APP pushes an over-temperature warning. Example

[0028] The above-described charging control system is used in a long-distance passenger bus charging system, and the difference compared to Example 1 is as follows: The remote communication module is enhanced with a WiFi module (model ESP8266), making it suitable for WiFi coverage scenarios within passenger transport stations and reducing communication costs. The energy storage module uses a 12V / 10Ah backup lithium battery, which supports the system to work continuously for 120 hours, meeting the needs of long-distance buses for long-term stops; The mobile app has added a "scheduled charging" function, which allows users to set a charging start time (such as during off-peak electricity hours at night). The system will automatically start charging according to the scheduled time, reducing operating costs.

[0029] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit and principles thereof should fall within the protection scope defined by the claims of the present invention.

Claims

1. A bus charging system, characterized in that, include: The charging interface module includes a charging gun socket and a gun insertion detection unit. After an external charging gun is connected to the charging gun socket, the gun insertion detection unit generates a gun insertion trigger signal and sends it to the charging control module to wake up the system and enter the charging preparation state. The remote communication module establishes a two-way communication link between the charging control module and the mobile terminal APP, used to transmit remote control commands and charging status information. The status detection module is used to detect the real-time status of the charging circuit and transmit the detection data to the charging control module in real time. The mobile terminal APP is installed on the user's electronic device, providing a visual operation interface and having fault alarm push function; The charging control module is used to receive the charging gun insertion signal from the charging interface module, the parameter signal from the status detection module, and the control command from the remote communication module, and output the charging control signal to the charging circuit to realize the automatic control of the charging process. The energy storage module provides independent power to the charging control module, charging interface module, and remote communication module.

2. The bus charging system according to claim 1, characterized in that, It also includes a safety protection module, which is electrically connected to the charging control module. When the status detection module detects abnormal parameters, the charging control module triggers the safety protection module to cut off the charging circuit and send a fault alarm signal to the mobile terminal APP through the remote communication module.

3. The bus charging system according to claim 1, characterized in that, The charging gun insertion detection unit has a built-in Hall sensor or mechanical contact switch, which generates a charging gun insertion trigger signal when the charging gun is inserted.

4. A bus charging system according to claim 1, characterized in that, The status detection module includes a voltage sensor, a current sensor, a temperature sensor, and an insulation detection unit; these are used to detect the voltage and current of the charging circuit, the temperature of the charging interface and battery pack, and the insulation resistance value of the charging circuit, respectively.

5. A bus charging system according to claim 1, characterized in that, The mobile app supports user registration and login, vehicle binding via VIN code or device number, initiating remote charging / stop commands, viewing real-time charging parameters and historical charging records, and sending alarm information to users in case of overvoltage, overcurrent, or overtemperature.

6. A control method for a bus charging system according to any one of claims 1-5, characterized in that, This method includes a local plug-in charging control process, the specific steps of which are as follows: 1) System wake-up: When an external charging gun is inserted into the charging gun socket, the insertion detection unit generates an insertion trigger signal and sends it to the charging control module; after receiving the signal, the charging control module wakes up from the sleep state and enters the charging preparation mode. 2) Parameter detection and verification: The charging control module starts the status detection module to perform initial detection on the charging circuit voltage, current, insulation resistance and charging interface temperature; if the detected parameters all meet the safety threshold, proceed to the next step; if the parameters are abnormal, an abnormal prompt signal is generated and charging is prohibited. 3) Charging circuit activation: The charging control module sends an activation command to the relay of the charging circuit to close the main charging circuit; at the same time, it automatically matches the charging current according to the current SOC (State of Charge) value of the bus battery pack. 4) Charging process monitoring: During the charging process, the status detection module collects charging parameters in real time and transmits them to the charging control module; the charging control module analyzes the parameters in real time, and if overvoltage, overcurrent, overtemperature or insulation fault occurs, it immediately sends a command to cut off the charging circuit, stop charging, and alarm through indicator lights or remote communication module. 5) Charging complete: When the battery pack SOC reaches 100%, or the status detection module detects that the battery pack is fully charged, the charging control module sends a command to cut off the charging circuit and complete the charging; at the same time, a charging complete notification is sent to the mobile terminal APP through the remote communication module.

7. The control method for a bus charging system according to claim 6, characterized in that, When the charging circuit is turned on and the charging current is automatically matched, if the SOC is ≤20%, a 0.5C high-current fast charge is used; if the SOC is ≥80%, it switches to a 0.2C low-current slow charge.

8. The control method for a bus charging system according to claim 6, characterized in that, The method also includes a remote APP charging control process, which specifically includes the following steps: 1) Command Initiation: After logging into their account and binding the target bus via the mobile terminal APP, the user clicks the "Start Charging" or "Stop Charging" button on the APP interface to generate a remote control command; the command is encrypted and then transmitted to the remote communication module. 2) Command Reception and Verification: After receiving the control command, the remote communication module transmits it to the charging control module. The charging control module verifies the legality of the command. If the verification is successful, it proceeds to the next step; if the verification fails, it sends an "invalid command" message to the APP. 3) Charging control execution: If the command is "Start charging": the charging control module executes steps 2-4 in the local plug-in charging control process, starts charging and provides real-time status feedback; if the command is "Stop charging": the charging control module immediately sends a command to cut off the charging circuit, stops charging, and sends a "Charging has stopped" notification to the APP.

9. The control method for a bus charging system according to claim 8, characterized in that, During the charging process, the charging control module transmits real-time charging parameters—voltage, current, SOC, and remaining time—to the mobile terminal APP via the remote communication module, which is then displayed in real time on the APP interface. Users can check the charging status or adjust the charging parameters at any time through the APP.

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