What's the trick to repair the electric car circuit?

Nowadays, people go shopping by electric car, which greatly facilitates people's travel. But if the electric car has circuit failure, how to repair it? The following is the coup of electric vehicle circuit maintenance compiled by Zhishi Bian Xiao, hoping to help you.

Electric vehicle circuit 1 maintenance coup, visual method

In the working environment exceeding the standard, the capacitor will heat and explode to relieve the unbearable pressure of body and mind. Some capacitors with poor quality will explode on the body and cannot be found. They are called small firecrackers, leaving no trace, leaving only a few tiny pieces of paper. Resistance: it will change color or smoke after heating overload. Of course, resistance will also explode, blow off or fly away. Devices with the same characteristics also include: MOS tubes, diodes, fuses, integrated blocks, and even the copper foil of the circuit board will melt due to overcurrent.

2. Resistance method

Use a digital multimeter to measure the suspicious part of the circuit. Generally measured by diode, indicating short circuit. The multimeter will call the probe to do some necessary discharge behavior before measuring the resistance. When it is confirmed that there is no commercial power, some capacitors are short-circuited one by one with tweezers, and sparks and sounds will be emitted when the capacitors are discharged. Don't be afraid, and then measure our online resistance.

3. Voltage method

Learning to measure voltage is one of the basic skills of maintenance. It is dangerous to measure on the road with electricity, so do it if necessary. Because there is a great possibility of accidentally damaging the charger during operation, if the charger is broken, don't be depressed and embarrassed. The best mechanic makes mistakes, even the master can't avoid them. Remember to measure the voltage with a clear purpose, and don't charge it blindly. This is a big no-no.

4. Substitution method

The replacement is to replace some equipment. The replaced equipment may be new or removed from the working charger. Why do you want to replace them? Generally speaking, our maintenance of this method has entered a relative bottleneck, and we will have such thoughts, such as: I suspect that 3842 is broken, so try another one! Substitution is more suitable for specific devices, such as capacitors, integrated blocks and other devices that may be damaged by soft. For other hard devices, we don't need to consider replacing them, such as fuses and MOS tubes, because these devices are bad in resistance measurement.

Common sense of proper use and maintenance of electric bicycles 1. Before using an electric bicycle, the height of the saddle and handlebar should be adjusted to ensure riding comfort and reduce fatigue. The height of the car seat and handlebar varies from person to person. Generally, the height of saddle is suitable for the rider to land on one foot reliably (the whole vehicle should be basically upright), and the height of handlebar is suitable for the rider's forearm to be flat and his shoulders and arms to be relaxed. However, the adjustment of saddle and handlebar must first ensure that the insertion depth of pipe and riser must be higher than the safety sign line.

2. Before using the electric bicycle, check and adjust the front and rear brakes. The front brake is controlled by the right brake handle, and the rear brake is controlled by the left brake handle. The adjustment of front and rear brakes is suitable for reliable braking when the left and right brake handles reach half stroke; Brake shoes are excessively worn and should be replaced in time.

3. Check the tightness of the chain before using the electric bicycle. When the chain is too tight, it is laborious to ride, and when it is too loose, it is easy to shake and rub other parts. The chain sag is 1-2mm, which can be adjusted properly when riding without pedals. When adjusting the chain, first loosen the rear wheel nut, unscrew the left and right chain adjustment screws evenly, adjust the chain tightness, and then tighten the rear wheel nut.

4. Check the lubrication of the chain before using the electric bicycle. Feel and observe whether the chain shaft rotates flexibly and whether the links are seriously corroded. If rust or rotation is not flexible, proper lubricating oil should be added, and the chain should be replaced in severe cases.

5. Before riding an electric bicycle, check whether the tire pressure, handlebar steering flexibility, front and rear wheel rotation flexibility, circuit, battery capacity, motor working condition, lighting, speakers and fasteners meet the use requirements.

(1) Insufficient tire pressure will increase the friction between the tire and the road surface, thus shortening the continuous driving mileage; It will also reduce the flexibility of handlebar rotation and affect the comfort and safety of riding. When the air pressure is insufficient, the air pressure should be replenished in time, and the air pressure should meet the air pressure recommended in the instruction manual of the electric bicycle or the air pressure specified on the tire surface.

(2) When the handlebar rotates inflexibly, if it is stuck, stiff or too tight, it should be lubricated or adjusted in time. Butter, calcium-based or lithium-based grease is generally used for lubrication; When adjusting, first loosen the lock nut of the front fork, turn the gear on the front fork, and lock the lock nut of the front fork when the rotation flexibility of the handlebar meets the requirements.

(3) The poor rotation flexibility of the front and rear wheels will increase the rotation friction and power consumption, thus reducing the continuous driving mileage. Therefore, once a fault occurs, it should be lubricated and maintained in time, usually with butter, calcium-based or lithium-based grease; If the shaft cover is faulty, the steel ball or shaft cover can be replaced; If the motor is faulty, it should be repaired by a professional maintenance unit.

(4) When checking the circuit, turn on the power switch to check whether the circuit is unblocked, whether the connector is plugged firmly and reliably, whether the safety tube works normally, especially whether the battery output terminal is connected firmly and reliably with the cable. If faults are found, they should be eliminated in time.

(5) Check the battery capacity before going out, and judge whether the battery capacity is sufficient according to the mileage. If the power is insufficient, it should be supplemented by human riding to avoid battery undervoltage.

(6) Check the working condition of the motor before going out. Start the motor and adjust its speed to observe and listen to the operation of the motor. If there is any abnormality, it should be repaired in time.

(7) Check the lights, speakers, etc. Before using electric bicycles, especially when traveling at night. Headlights should be on, and the light beam generally falls within 5- 10 meters in front of the front of the car; The horn should be loud and not hoarse; The turn signal lamp should flash normally, and the turn indication is normal, and the flashing frequency of the lamp should be 75-80 times/minute; The instrument display should be normal.

(8) Before going out, check whether the main fasteners are fastened. Such as horizontal pipes, vertical pipes, saddles, saddle pipes, front wheels, rear wheels, central shafts, locking nuts, pedals and other fasteners. It should not be loose. If the fasteners are loose or fall off, they should be tightened or replaced in time. The recommended torque of each fastener is generally: horizontal pipe, vertical pipe, saddle, saddle pipe, front wheel, pedal 18N.m, middle axle lock nut and rear wheel 30N.m.

6. Try not to use zero start (that is, start in place) for electric bicycles, especially when they are fully loaded and uphill. When you start, you should ride with manpower first, then turn to electric drive after reaching a certain speed, or directly use electric power to assist driving. This is because when starting, the motor must first overcome the static friction. At this time, the current is large, close to or even reaching the rotating resistance current, which makes the battery work with high current and accelerates the damage of the battery.

7. When riding an electric bicycle, try to use human assistance or electric assistance, especially when going uphill, carrying loads, driving in the wind or bumping the road. This can prevent the battery from being damaged due to long-term heavy current discharge, which is beneficial to improve the continuous mileage of one-time charging and prolong the service life of the battery.

8. Electric bicycles are not suitable for rugged or steep slopes. 8? ) the road. In case of such roads, you should drive slowly or get off. When driving on this kind of road, the working environment of motor, controller and battery is poor, which will reduce the service life and be easily damaged.

9. Electric bicycles should avoid frequent braking and starting when driving. Before or at the same time of braking, the speed control knob should be returned, and people should be used to ride in the area supported by the road as much as possible. This can prevent the battery from being damaged by large current when starting.

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