1. understand the general sequence of car circuit diagrams
1. The power supply is limited to the fuse or switch of the wire is commonly used in the front end of the appliance. It is usually drawn on the upper part of the circuit diagram in the circuit schematic.
2. The standard drawing method of the circuit diagram is that the contact of the switch 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. The turning on and off of elements with switching characteristics, such as transistors and thyristors, depends on the whole house situation.
3. The automobile circuit is characterized by dual power supply and single wire system, each electrical appliance is connected in parallel with each other, and the relay and switch are connected in series in the circuit.
4. Most power-consuming devices pass through fuses and are valued by fuses.
5. According to the effectiveness and working principle, the vehicle circuit is composed of several independent circuits. This can solve the problem of huge and chaotic vehicle circuit and difficult 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 the circuit of the whole car is easy to understand.
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, a circuit is a basic, important, simple concept. Any complete circuit consists of power supplies, electrical appliances, switches, wires, etc. With regard to DC circuits, current always flows from the positive pole of the power supply and through wires, fuses and switches to the consumers. It then passes through the wire (or ground) and returns 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 returns 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. On the car track. 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 equipment, return to another negative pole for power supply, and that's it. No true path is formed and no current is present. Look at the car circuit repair training. So it must be an exaggeration. Loop refers to driving from the positive pole of the power supply, passing through the appliance, and then returning to the negative pole of the same power supply.