A method for remotely pre-heating an electric bus cabin

Abstract

The application discloses a kind of electric bus cabin remote preheating method, specifically relates to electric bus remote control technical field, by obtaining the preheating instruction sent by remote monitoring platform, vehicle controller is called according to preheating instruction and carries out electric bus whole vehicle self-checking, when completing whole vehicle self-checking and reaching preheating time, MCU is called to open BMS, and preheating signal is sent to battery pack by BMS to the electric bus cabin, and charging signal is sent to charging pile by BMS, and the electric bus is charged by charging pile, when the temperature in the electric bus cabin reaches the set temperature threshold, and the power reaches the set power threshold, the remote preheating of electric bus cabin is completed, the electric bus cabin is preheated before departure to provide comfortable cabin environment, and prevent the electric bus from consuming power due to preheating, and charge it, so as to ensure the endurance of electric bus.

Description

Technical Field

[0001] This invention relates to the field of remote control technology for electric buses, specifically a method for remote preheating of the passenger compartment of an electric bus. Background Technology

[0002] During the extreme temperatures of summer and winter, the interior temperature of electric buses can be excessively high or low. This often affects the riding environment for drivers and passengers. Furthermore, the discharge characteristics of electric bus batteries are poor in low temperatures, resulting in reduced driving range. Additionally, charging electric buses in low temperatures requires preheating the batteries, which consumes a significant amount of time and battery power, preventing the buses from being fully charged before departure and necessitating recharging, thus impacting range. Current technology typically requires heating the entire vehicle before starting, but in cold weather, heating the entire passenger compartment to the comfortable temperature required for normal operation is too time-consuming, affecting the comfort of the electric bus and subsequent service, causing delays, insufficient range, and cold passenger compartments.

[0003] Chinese patent CN108501675A discloses a method and system for remote preheating control of electric vehicles. The method includes: acquiring a reservation command sent by a remote terminal and determining the reservation start time based on the command; acquiring the preheating time required to heat the power battery to a first set temperature threshold and determining the preheating start time based on the start time and the preheating time; if the preheating start time is greater than the set time threshold, the on-board TBOX starts timing; upon reaching the preheating start time, a sleep wake-up signal is sent via the CAN bus to wake up the vehicle controller, and a preheating signal is sent to the vehicle controller; after receiving the preheating signal, the vehicle controller sends a heating signal to the battery management module, which then controls the heating module to preheat the power battery. This invention can improve vehicle comfort and increase the range of electric vehicles. However, this invention is used in electric vehicles and only heats the power battery, thus not significantly improving vehicle comfort and also posing certain risks. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a remote preheating method for electric bus compartments in light of the current state of the technology. The method uses BMS control to preheat the electric bus compartment and complete the charging of the electric bus, so that the temperature inside the vehicle reaches the set value when the vehicle departs, thereby improving the comfort of the electric bus and ensuring that the battery is fully charged when the vehicle departs.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a method for remote preheating of the carriage of an electric bus, characterized in that it includes:

[0006] S1: Receive the preheating command sent by the remote monitoring platform;

[0007] S2: Call the vehicle controller to perform a self-check of the electric bus according to the preheating command. When the self-check is completed and the preheating time point is reached, proceed to the next step.

[0008] S3: Call the MCU to start the BMS, and send a power-on signal to the battery pack through the BMS to preheat the electric bus compartment;

[0009] S4: When the battery pack of the electric bus is below the set power threshold, a charging signal is sent to the charging station through the BMS, and the charging station charges the electric bus.

[0010] S5: When the temperature inside the electric bus reaches the set temperature threshold and the power reaches the set power threshold, remote preheating of the electric bus is completed.

[0011] Furthermore, the vehicle self-test in step S2 includes BMS self-test and CC2 signal self-test. When the BMS receives the BMS wake-up signal transmitted by the vehicle controller, it starts the vehicle self-test.

[0012] Furthermore, under normal conditions, the CC2 signal is maintained during the vehicle self-inspection phase and the preheating phase of the electric bus.

[0013] Furthermore, in step S2, when the electric bus malfunctions during self-testing, it sends a self-testing fault signal to the remote monitoring platform, which then displays the fault information and stops remote preheating.

[0014] Furthermore, in step S4, after receiving the charging signal, the charging pile lowers the control guidance function signal value and controls the charging pile to charge the electric bus according to the lowered control guidance function signal, and performs a charging self-test.

[0015] Furthermore, in step S5, when the electric bus compartment completes remote preheating, a heating stop signal is sent through the BMS, and the electric bus enters a sleep state.

[0016] Furthermore, the heating stop signal includes a preheating stop signal and a charging stop signal.

[0017] Furthermore, the charging stop signal is divided into a self-recoverable charging stop signal and a non-self-recoverable charging stop signal. Among them, the charging stop signal is a non-self-recoverable charging stop signal when the electric bus stops charging due to internal BMS reasons or human-controlled network outage.

[0018] Furthermore, when the BMS receives the self-recoverable charging stop signal and the non-self-recoverable charging stop signal, the self-recovery charging state of the electric bus is different, wherein:

[0019] When the BMS receives the non-recoverable charging stop signal, the electric bus battery will not be able to recharge.

[0020] When the BMS receives the self-recoverable charging stop signal, it sends a confirmation message to resume charging via the CAN bus according to the internal situation of the electric bus, and the electric bus resumes charging automatically.

[0021] Furthermore, the electric bus shall not self-recharge more than twice.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] (1) The electric bus compartment remote preheating method of the present invention uses BMS to remotely preheat the electric bus compartment, providing a comfortable compartment environment before departure time, without taking up extra departure time for compartment heating, thus avoiding the phenomenon that the internal temperature of the compartment has not reached a suitable temperature when departure.

[0024] (2) When the electric bus’s battery level is lower than the set battery level threshold, a charging signal is sent to the charging pile through the BMS. The charging pile charges the electric bus to prevent the electric bus from consuming power due to preheating and having insufficient power after departure, thereby ensuring the electric bus’s range.

[0025] (3) When the electric bus self-tests and malfunctions, it sends a self-test fault signal to the remote monitoring platform, displays the fault information through the remote monitoring platform and stops remote preheating, thereby improving the safety of remote preheating of electric buses. Attached Figure Description

[0026] Figure 1 This is a flowchart of a method for remote preheating of an electric bus compartment provided by the present invention. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] Example 1

[0029] To improve the comfort of electric buses, the bus cabin can be remotely preheated in cold environments to avoid delays in departure and insufficient driving range. Figure 1 As shown, the present invention provides a method for remote preheating of an electric bus compartment, characterized in that it includes:

[0030] S1: Receive the preheating command sent by the remote monitoring platform;

[0031] S2: Call the vehicle controller to perform a self-check of the electric bus according to the preheating command. When the self-check is completed and the preheating time point is reached, proceed to the next step.

[0032] S3: Call the MCU to start the BMS, and send a power-on signal to the battery pack through the BMS to preheat the electric bus compartment;

[0033] S4: When the battery pack of the electric bus is below the set power threshold, a charging signal is sent to the charging station through the BMS, and the charging station charges the electric bus.

[0034] S5: When the temperature inside the electric bus reaches the set temperature threshold and the power reaches the set power threshold, remote preheating of the electric bus is completed.

[0035] During summer and winter, when temperatures are excessively high or low, the entire passenger compartment of the electric bus can be remotely preheated or pre-cooled before departure. Taking winter low-temperature conditions as an example, depending on the specific usage of the vehicle, the user sends a preheating command to the vehicle controller through a remote monitoring platform. The vehicle controller performs a self-check of the electric bus before the preheating time based on the preheating command. If no abnormalities are found after the self-check, the electric bus calls the MCU to activate the BMS and sends a power-on signal to the battery pack, initiating the vehicle preheating process. The BMS then initiates the high-voltage power-on process and the discharge circuit to start the passenger compartment heating process. When the electric bus battery pack consumes power during the preheating process, causing the battery level to fall below a set threshold, the BMS will activate the preheating signal. A charging signal is sent to the charging station to initiate the charging process. The charging station charges the electric bus. Before the charging process begins, the charging gun must be kept inserted into the electric bus and the bag to be charged must be kept in place. When the internal temperature of the electric bus reaches the set temperature threshold and the power level reaches the set power level threshold, the charging process and the high-voltage power-off process end. All high and low voltage equipment and the BMS of the electric bus are woken up and powered down. A heating stop signal is sent through the BMS, and the vehicle controller enters a sleep state. This can maintain the existing internal temperature of the bus and the power required for the electric bus to run, thus completing the remote preheating of the electric bus compartment, thereby maintaining a suitable internal temperature and sufficient power, improving departure and driving efficiency.

[0036] In step S2, the vehicle self-test includes BMS self-test and CC2 signal self-test, ensuring a good connection between the electric bus controller and the vehicle. When the BMS receives the BMS wake-up signal from the vehicle controller, it begins the vehicle self-test. Under normal conditions, the CC2 signal remains active from the start of the vehicle self-test until the preheating stage, and if the BMS self-test is normal, the remote preheating process of the electric bus can proceed. If a fault occurs during the self-test, a fault signal is sent to the remote monitoring platform. The remote monitoring platform displays the electric bus fault information and stops remote preheating. Repair and adjustment are performed based on the fault information to improve the safety of remote preheating of the electric bus. The BMS and CC2 signals are important parts of the electric bus preheating process. The BMS controls the vehicle preheating process, and the CC2 signal ensures the connection is intact and prevents preheating failures.

[0037] Furthermore, in step S4, after receiving the charging signal, the charging pile lowers the control guidance function signal value and controls the charging pile to charge the electric bus according to the lowered control guidance function signal, and performs a charging self-test.

[0038] In step S4, the charging gun needs to be inserted into the charging position of the electric bus in advance. When the charging pile receives the charging signal, it lowers the control guidance function signal value. After the charging pile MCU detects the change in the control guidance function signal value, it changes the output signal to control the charging pile to charge the electric bus and perform a charging self-check to prevent malfunctions during charging.

[0039] Furthermore, the heating stop signal includes a preheating stop signal and a charging stop signal.

[0040] The heating stop signals sent by the BMS include preheating stop signals and charging stop signals. These signals allow the electric bus to stop and enter a sleep state when a malfunction occurs during preheating or when preheating is complete. To better protect the electric bus and prevent delays in handling malfunctions during remote preheating, inspections are conducted during charging and preheating, including checks on the motor, air conditioning, and charging station. In case of a malfunction, corresponding fault feedback and related information are transmitted to the remote monitoring platform, facilitating equipment adjustments by staff and improving work efficiency.

[0041] Furthermore, the charging stop signal is divided into a self-recoverable charging stop signal and a non-self-recoverable charging stop signal. Among them, the charging stop signal is a non-self-recoverable charging stop signal when the electric bus stops charging due to internal BMS reasons or human-controlled network outage.

[0042] Furthermore, when the BMS receives a self-recoverable charging stop signal and a non-self-recoverable charging stop signal, the self-recovery charging state of the electric bus is different, wherein:

[0043] When the BMS receives a non-recoverable charging stop signal, the electric bus battery will not be able to recharge.

[0044] When the BMS receives a self-recovering charging stop signal, it sends a confirmation message to resume charging via the CAN bus based on the internal conditions of the electric bus, and the electric bus resumes charging automatically.

[0045] Furthermore, electric buses cannot self-recharge more than twice.

[0046] The charging stop signal is divided into a self-recoverable charging stop signal and a non-self-recoverable charging stop signal. When the charging of the electric bus is stopped due to internal BMS reasons or human-controlled network disconnection, the charging stop signal is a non-self-recoverable charging stop signal. This includes internal safety reasons of the BMS such as BMS insulation failure, cell overvoltage, and charging socket overheating, or due to human-controlled direct network disconnection, terminating the charging. The electric bus cannot self-recover. However, when the BMS receives a self-recoverable charging stop signal, it will send a confirmation message to resume charging via the CAN bus, depending on the internal situation of the electric bus, including reasons such as the power consumption of on-board high and low voltage equipment causing the power to fall below the set power threshold, power grid failure, and other non-charging-affecting factors. If charging can be restarted, the electric bus will self-recover and re-establish the charging connection. However, the number of self-recovery charging attempts by the electric bus should not exceed two to prevent charging failures and safety hazards caused by multiple restarts.

[0047] In summary, the present invention provides a remote preheating method for electric bus compartments. This method acquires a preheating command from a remote monitoring platform, invokes the vehicle controller to perform a self-check of the electric bus based on the command, and upon completion of the self-check and the arrival of the preheating time, invokes the MCU to activate the BMS. The BMS then sends a power-on signal to the battery pack to preheat the electric bus compartment and sends a charging signal to the charging station to charge the electric bus. When the internal temperature of the electric bus compartment reaches a set temperature threshold and the battery level reaches a set power threshold, the remote preheating of the electric bus compartment is complete. This method provides a comfortable ride before the electric bus's departure time. The passenger compartment environment is designed to avoid additional time constraints during departure for heating, thus preventing the interior temperature from not reaching a suitable level before departure. When the electric bus's battery level drops below a set threshold, a charging signal is sent to the charging station via the BMS. The charging station then charges the electric bus, preventing insufficient power after departure due to preheating consumption. This ensures the electric bus's range and guarantees that the interior temperature reaches the set value before departure, while also ensuring the battery is fully charged. If a self-check fault occurs, a fault signal is sent to the remote monitoring platform, which displays the fault information and stops remote preheating, improving the safety of remote preheating of the electric bus.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0052] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the scope defined by the spirit of the invention.

Claims

1. A method for remote preheating of an electric bus carriage, characterized in that, include: S1: Receive the preheating command sent by the remote monitoring platform; S2: Call the vehicle controller to perform a self-check of the electric bus according to the preheating command. When the self-check is completed and the preheating time point is reached, proceed to the next step. S3: Call the MCU to start the BMS, and send a power-on signal to the battery pack through the BMS to preheat the electric bus compartment; S4: When the battery pack of the electric bus is below the set power threshold, a charging signal is sent to the charging station through the BMS, and the charging station charges the electric bus. S5: When the temperature inside the electric bus reaches the set temperature threshold and the power reaches the set power threshold, the electric bus will be remotely preheated. In the normal state of the electric bus, the CC2 signal is maintained during the vehicle self-inspection stage and the preheating stage. In step S5, when the electric bus compartment completes remote preheating, a heating stop signal is sent through the BMS, and the electric bus enters a sleep state. The heating stop signal includes a preheating stop signal and a charging stop signal. The charging stop signal is divided into a self-recoverable charging stop signal and a non-self-recoverable charging stop signal. When the electric bus charging is stopped due to internal BMS reasons or human-controlled network outage, the charging stop signal is a non-self-recoverable charging stop signal. In step S4, after receiving the charging signal, the charging pile lowers the control guidance function signal value and controls the charging pile to charge the electric bus according to the lowered control guidance function signal, and performs a charging self-test. When the BMS receives the self-recoverable charging stop signal and the non-self-recoverable charging stop signal, the self-recovery charging state of the electric bus is different, wherein: When the BMS receives the non-recoverable charging stop signal, the electric bus battery will not be able to recharge. When the BMS receives the self-recoverable charging stop signal, it sends a confirmation message to resume charging via the CAN bus according to the internal situation of the electric bus, and the electric bus resumes charging automatically.

2. The method for remote preheating of the electric bus compartment according to claim 1, characterized in that, The vehicle self-test in step S2 includes BMS self-test and CC2 signal self-test. When the BMS receives the BMS wake-up signal transmitted by the vehicle controller, it starts the vehicle self-test.

3. The method for remote preheating of an electric bus compartment according to claim 1, characterized in that, In step S2, when the electric bus malfunctions during self-testing, it sends a self-testing fault signal to the remote monitoring platform, which then displays the fault information and stops remote preheating.

4. The method for remote preheating of an electric bus compartment according to claim 1, characterized in that, The electric bus shall not be able to self-recharge more than twice.

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