For example, the types of automobile circuit diagrams are:
I. Principle block diagram
The car circuit is very complicated. In order to roughly represent the basic components, their relationships and main features of automotive electrical systems or subsystems, the principle block diagram is often used. The so-called principle block diagram refers to a schematic diagram showing the basic composition, relationship and main characteristics of automobile electrical appliances with symbols or marked boxes. The object described in the principle block diagram is the main feature of the system or subsystem, and its description of the content is rough, which is used to indicate that the system or subsystem is basically composed of graphic symbols and comment boxes.
The principle block diagram describes the system or subsystem as a whole, which is the product of the initial design of the system or subsystem and is drawn according to the level of functional decomposition of the system or subsystem.
Second, the circuit schematic diagram
1, overview
In order to show all the basic elements and connection relations of actual equipment or complete sets of devices in detail and understand the action principle in detail, it is necessary to draw the circuit schematic diagram (also called circuit diagram or electrical circuit diagram).
The so-called circuit diagram is to draw the circuit uniformly on the drawings with graphic symbols and text symbols according to the relevant technical standards promulgated by the state. It is an important circuit diagram widely used in electrical technology. It has the characteristics of clear, simple and clear circuit and easy understanding of circuit principle.
Automobile circuit diagram is drawn with electrical graphic symbols according to working sequence or functional layout, which shows all components and connection relationships of automobile circuit in detail, regardless of actual position.
Third, line drawing
1, overview
The basic composition, phase relationship and main characteristics of automobile electrical appliances can be roughly understood from the principle block diagram, and the mutual control relationship and working principle of electrical components can be understood in detail from the automobile circuit diagram, but the actual situation of automobile electrical appliances can not be expressed. In order to facilitate the layout and connection of automobile electrical circuits, we often need to draw a map.
The so-called wiring diagram refers to the instruction diagram specially used to mark the installation position, appearance and wiring direction of electrical equipment. According to the actual orientation of the vehicle electrical equipment installation, the connection between components is drawn according to the actual relationship. In order to be as close as possible to the actual situation, the electrical appliances in the figure are represented by the outline or characteristics of the electrical appliances instead of graphic symbols, and attention is also paid to drawing the wires in the harness together in the same way as possible. In this way, the automobile layout clearly reflects the actual line situation of the automobile, and it is easy to find the branches and contacts in the middle of the wires when checking the line, which provides convenience for installing and testing the automobile circuit. However, due to its dense lines and criss-crossing, it is inconvenient to read pictures, find and analyze faults.
Four. Wiring harness installation drawing
1, overview
Although the wiring diagram reflects the actual installation position of electrical equipment in the car, the wires on the diagram are criss-crossed, which increases the difficulty of reading the diagram. In order to make the circuit diagram closer to reality, it is often necessary to draw a wiring harness installation diagram, and relatively concentrate the wires in the same way in the wiring diagram to form a wiring harness.
In automobiles, in order to facilitate the installation and protection of wires, many wires in the same way are wrapped with cotton yarn weaving or PVC plastic tape, which is called wire harness.
The wiring harness diagram is the circuit diagram of the whole vehicle drawn according to the actual installation position of electrical equipment in the car. On the drawing, the wires between parts appear in the form of wire harness, which is similar to the layout, but the double layout of the drawing is simple and clear, close to reality, and has strong applicability to users and maintenance personnel.
The wiring harness installation drawing does not describe the direction of wires inside the wiring harness in detail, but only numbers the wires and connectors exposed outside the wiring harness in detail and marks them with letters. Wiring marks indicate prominence and facilitate wiring, and all terminals are accurately marked with serial numbers and colors. The combination of wiring diagram, circuit diagram and layout diagram has great reference value. Therefore, modern automobile maintenance manuals generally give circuit diagrams and wiring harness installation drawings.