Principle and Maintenance of Automobile Circuit

1. understand the general sequence of car circuit diagrams
1. Limiting wire fuses or switches are commonly used front ends of electrical equipment. It is generally drawn on the upper part of the circuit diagram in the circuit schematic.
2. The circuit diagram of the standard drawing method, the contact of the switch is in the zero position or the moving position. 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 is turned on and off depending on a full room condition.
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 of the power-consuming equipment has to pass through the fuse and is protected by the fuse.
According to the efficacy and working principle, the vehicle circuit is composed of multiple independent circuits. This can solve the problem of huge and messy vehicle circuits and difficult problem analysis. At present, the vehicle circuit is generally 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 understood thoroughly, and the whole vehicle circuit is easy to understand.
2. Responsible for reading circle notes
Responsible for reading the legend, understand the title and technical type of the circuit diagram, and want to know 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 the map.
3. control circuit
In electricity, the circuit is the most basic, the most important and the most simple concept. Any complete circuit is composed of power supply, electrical appliances, switches, wires, etc. As far as DC circuits are concerned, the current always starts from the positive pole of the power supply and reaches the appliance through wires, fuses and switches. Then through the wire (or ground), back to the negative terminal of the same power supply. In this process, as long as there is a link failure, the 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) is used up, it finally returns to the positive pole of the same power supply. Since the potential difference (voltage) of the power supply exists 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 current. In the car circuit. Both the generator and the battery are power sources. When looking for circuits, they cannot be confused, nor can they be driven from the positive pole of the power supply. After passing through some electrical equipment, it returns to the negative pole of another power supply, so that. No true path is formed and no current is present. Look at the car circuit repair training. So be sure to exaggerate. The loop refers to starting from the positive pole of the power supply, passing through the electrical appliances, and then returning to the negative pole of the same power supply.

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