When the hot summer arrives, the owners must not only prevent their own heat stroke, but also pay attention to the “cooling and cooling†of pure electric buses. If car owners can do the summer maintenance of pure electric buses, they can not only prolong the life of vehicles, but also ensure the safe operation of vehicles.
The use of the vehicle operation precautions
1. When the pure electric bus starts, it should slowly increase the accelerator; lightly step on the accelerator and brake during driving. This kind of driving habits can reduce power consumption, increase comfort, and can slow down the rise of lithium battery temperature.
2. Lithium batteries for pure electric passenger cars are generally installed at the bottom of the vehicle. Therefore, vehicles should not be involved in deep water (within 200mm). The wading process should also be slowed down to prevent rain from splashing into high-voltage systems such as lithium batteries.
3. Parking during the rainy season Close the window door; avoid flushing against the grille when washing the vehicle. Pure electric buses have many electrical systems. If moisture enters, it will damage the electrical system.
4. Parking in the summer should avoid direct exposure to sunlight. In the case of solar exposure, the vehicle heat load increases dramatically. Battery, motor, air-conditioner and other equipment will have lower working efficiency due to increased temperature, and the service life will be shortened.
5. The motor cooling mode of a pure electric passenger car is water cooling. Before the operation of the vehicle, check whether the amount of antifreeze is sufficient. Supplemented antifreeze should also be designated special antifreeze.
6. All-electric air conditioners are used in pure electric buses. The temperature setting of the air conditioner should not be too low, and the running time should not be too long, so as to avoid excessive power consumption and thus affecting the mileage of the vehicle.
Charging precautions
1. When the electric vehicle is being charged, it should be parked at a designated position to confirm that the vehicle is out of flame, the key is removed, and the brake has been pulled up.
2. Place a warning sign “Charge danger not to approach†in a prominent position next to the charging vehicle.
3 Check whether the charging plug and the vehicle body socket type charger match.
4. In hot weather, chargers and accumulators should be checked for temperature.
5. If there is any abnormality in the charger, immediately stop the operation, find the cause, and strictly prohibit running.
6. It is forbidden for non-professionals to approach, freely touch the charging cable and plug, and operate the charging equipment to ensure the safety of electricity.
Lithium batteries and daily inspection of high and low pressure systems
1 box inspection:
1 Observe the surface of the cabinet to see if there is any obvious dust. If any, wipe it with a dry rag.
2 Observe whether there is obvious corrosion and deformation on the surface of the box; whether there is obvious deformation or damage to the box fixing bracket.
3 Use an insulated tool to check if the housing fixing bolts are loose and make sure that the bolts are tight.
4 Check whether the cooling fan of the cabinet is normal and whether the cold air input pipe is open.
2. Insulation detection:
Use gloves and insulation tester to check whether the box high pressure total positive/total negative insulation value is greater than 200M (1000V file); low cabinet
Is the insulation value of the 24V power supply wiring harness to the housing greater than 15M? (500V gear). If you are not satisfied, please report promptly.
3.BMS (battery management system) check:
Always check the voltage display is normal (2.8V ~ 4.0V range), the temperature display is normal (-20 °C ~ 60 °C range).
4. High voltage line inspection:
1 Use insulation tools to check whether the bolts in the series wiring harness between the cabinets are connected properly, without any looseness, rust, cracking, etc.
2 Use an insulation tool to detect and confirm the harness fastening without shaking.
3 Observe whether the copper wire is exposed on the insulation layer of the high voltage harness.
5. Low voltage harness inspection:
1 Use an insulation tool to check whether the 24V low voltage wiring harness and the communication harness are connected correctly. No looseness, back needle, or damage.
2 Insulation tools are used to detect and confirm the fastening of the wiring harness, without falling off or messy.
Daily inspection of the motor
1. Check if abnormal vibration occurs during operation of the motor and abnormal changes occur in the running sound.
2. Check if the temperature of the motor and motor controller is abnormal; whether the bolts are loosened; whether the lead wire sheath is worn or not; whether the installation environment changes significantly.
3. Check whether the tank has enough antifreeze, whether the cooling water pump or cooling fan is operating normally. Check that the water channel is open and clean regularly.
Thermal system (ATS) routine maintenance
1. Check the appearance of the radiator tank from time to time to observe whether there is any damage or leakage from the piping and the heat sink is free from lodging. If there is any leakage or need to be repaired, correct it.
2. There are dust accumulations or catkins, leaves, and other debris in the core of the heat exchanger. Use high-pressure gas to blow them off. Prevent the cooling tape from lodging. Do not flush with water.
3. Before the welding operation of the vehicle, the ECU must be disconnected and the welding operation must be completed.
4. The plug-ins used for the cooling system are all waterproof plug-ins. The ECU also has a certain waterproof and dustproof function, but it is not completely waterproof. Therefore, during routine maintenance or driving, it must be prevented from being flooded and a circuit short-circuit fault is caused.
Summer is a test for pure electric buses. If owners follow the above tips, they will be able to bring a cool feeling to the vehicle and provide passengers with a quality pure electric bus ride experience.
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