Principle and Maintenance of Automobile Circuit

1. understand the general sequence of car circuit diagrams
1. The power supply is limited to wires, and the fuse or switch is the common front end of electrical equipment. It is usually drawn on the upper part of the circuit diagram in the circuit schematic.
2. The circuit diagram adopts the standard drawing method, and the switch contact is in the zero position or dynamic. That is, the switch is in an off state or the relay coil is in a non-energized state. An element having switching characteristics, such as a transistor and a thyristor, turns on and off depending on the whole house situation.
3. The characteristics of the automobile circuit are dual power supply and single wire system, the electrical appliances are connected in parallel with each other, and the relay and switch are connected in series in the circuit.
4. Most electrical equipment through the fuse, the fuse is cherished.
5. According to the effectiveness and working principle, the vehicle circuit is composed of several independent circuits. This can solve the problem of the huge confusion of the whole vehicle circuit and the difficulty of title analysis. Nowadays, the entire automobile circuit is usually drawn according to various circuit layouts, such as power supply system, starting system, ignition system, lighting system, signal system, etc. These unit circuits have their own characteristics. The principle is well understood, and it is easy to understand the circuit of the entire car.
2. Responsible for reading circle notes
Responsible for reading the legend, understanding the title and technical type of the circuit diagram, and wondering how long it will take to learn car maintenance. Understand the meaning of graphic symbols and the correlation between equipment parts and graphic symbols one by one, so as to quickly and accurately identify pictures.
3. drive circuit
In electricity, the circuit is the most basic, the most important and the most simple concept. Any complete circuit is composed of power supplies, electrical appliances, switches, wires, etc. For DC circuits, current always flows from the positive pole of the power supply, through wires, fuses and switches to the consumer. Then pass through the wire (or ground wire) and return to the negative terminal of the same power supply. In this process, only one link needs to fail, and this circuit will not be accurate and useful. For example: How long does it take to learn how to repair a car from the positive pole of the power supply? After a certain electrical appliance (or another electrical appliance), it will eventually return to the positive pole of the same power supply. Since the potential difference (voltage) of the power supply is only between the positive and negative electrodes of the power supply, the same electrode of the power supply is equipotential. There is no voltage. This "positive-to-positive" approach does not generate an electric current. In the car circuit. Both the generator and the battery are power sources. When looking for circuits, they should not be confused, nor can they be driven from the positive pole of the power supply. After passing through multiple electrical devices, return to the negative pole of another power source, and so on. No true path is formed and no current is present. Look at the car circuit repair training. So this must have been exaggerated. Loop refers to driving from the positive pole of the power supply, passing through the appliance, and returning to the negative pole of the same power supply.