What is car polishing used for???

If it is a new car, it is okay to regularly wax the car by hand, but if there are some small scratches on the surface of the paint and the wax cannot be disposed of, you can choose car polishing. Generally, if the whole car is polished, it will take at least half a day, the whole car should be washed first, and then polished with 3m polishing fine sand, and then the coarse wax will be thrown, followed by fine wax and beauty wax, handmade wax, and finally the car will be washed. Generally, the whole car is polished once 300 500, which depends on the local economic situation.

Polishing and waxing is a kind of protection for car paint, and of course it is beneficial.

Do you know what polishing means? Just remove the paint from the outside.

Make it look new.

There are no hanging marks, don't polish and polish.

The biggest difference between an electronically controlled engine and a carburetor engine is the fuel supply system. The fuel supply system of the electronically controlled engine has eliminated the carburetor, but a number of electronic automatic control devices have been added. These include many sensors, actuators, and ECUs.

Electronically controlled engines have to do not only what carburetors do, but also what carburetors can't do. For example, the specific concentration of air-fuel in a combustible mixture can be controlled within the required range. The oil circuit and circuit of the carburetor engine are very clearly divided and do not affect each other much.

The electronically controlled engine fuel supply system increases the electronic control part, which makes the oil circuit and circuit interconnected, which not only affects the work of the engine fuel system, but also affects the normal operation of the engine. Due to the increase in electronic control devices for electronically controlled engines, this makes the entire structure of the engine, including the electronic control system, more complex.

Fast. Navigation.

Structural composition. How it works.

Parameters to be measured. Merit.

Basic idea. In the initial stage, the function of the system is realized by replacing the mechanical control technology with electronic technology, and its function is expanded, so that the performance is greatly improved; After the development to a certain extent, electronic technology can promote the essential change of the system principle, so that the limitations can be broken through, so that the engine performance can be greatly improved.

Electronically controlled engine.

Structural composition. Electronic control unit.

The electronic control unit (ECU) is the heart of the engine's electronic control system. It completes the collection of various parameters of the engine, the control of fuel injection volume and fuel injection timing, and determines the function of the entire electronic control system.

Sensor. Sensors transmit information about engine conditions and environment to the ECU in real time and realistically through various signals.

In other words, what the ECU learns is just an engine made up of many signals. Therefore, the accuracy, reproducibility and immediacy of sensor information directly determine the quality of control.

Actuators. The various control functions to be completed by the electronic control system are realized by various actuators.

In the control process, the actuator converts the control signal from the ECU into a certain mechanical motion or electrical movement, thereby causing the change of engine operating parameters and completing the control function.

How it works. The engine speed and load are used as the basic signals reflecting the actual working conditions of the engine, and the basic fuel injection amount and fuel injection timing are determined with reference to the fuel injection amount and fuel injection timing spectrum corresponding to each working condition of the engine obtained by the test, and then various compensation is made according to various factors (such as water temperature, oil temperature, atmospheric pressure, etc.), so as to obtain the best fuel injection amount and fuel injection timing or ignition timing, and then control the output through the actuator.

First, the role of automobile polishing:

1. It is used to reduce the surface roughness of the car to obtain a bright and smooth surface, 2. To remove the oxide layer on the paint surface, shallow scratches, and the paint surface loss caused by oxidation.

Second, the specific methods of automobile polishing are as follows:

1) Defect removal: spray a small amount of water on the paint surface, use P1500 pyramid sandpaper and dry grinder to go up and down and left and right as a whole, and the paint surface is in a matte state; After sanding, use a rubber wiper to scrape off the white foam on the surface, observe the paint surface to find outstanding defects, and spray a small amount of water on the disc to remove the defects.

2) The paint surface is too fine: use a dry grinder with P3000 pyramid sand disc and dry grinding cushion to polish the paint surface too finely, spray a certain amount of water on the discs and paint surface, and polish the entire paint surface in two lines in the order of up and down left and right at a faster moving speed. After sanding, use a rubber wiper to scrape off surface water and white foam.

Quality standard: no defects such as oxide layer and scratches on the paint surface.

3) Coarse wax polishing: After sandpaper grinding, the surface sandpaper marks are further removed to restore the paint surface flatness and initial gloss.

Apply the wax evenly in a certain paint area, and the speed of the polishing machine is controlled between 1200-2000 rpm. At the initial stage, press the polishing disc with medium to upper pressure to polish the paint surface at an average speed, observe the paint surface, and relax the pressure to throw away the wax marks after the sandpaper marks are obviously removed, and restore a certain luster of the paint surface. After polishing, a microfiber cloth should be used to wipe off the coarse wax and dust remaining on the paint surface.

Car polishing is a kind of polishing the car before the car is waxed or coated, because the vehicle only looks like a sparkling effect after the vehicle is polished, and the effect of the car that has not been polished is generally not long-lasting after waxing. The main working process is to clean the body first, and remove the dust of those particles in the cleaning process to avoid secondary scratches to the vehicle, polish after cleaning, polish after grinding, and wax after polishing to see the car look new, but is it often polished, is it not as long as the car is dirty can be polished.

Remove car surface stains and remove scratches: When there are scratches on your car and you are distressed, or there are some stains that cannot be cleaned, you can choose car polishing, after the car polishing has been reduced by mirror, you can clean the body paint to the previous state, and at the same time, you can also throw away some oxides and corrosives attached to the body such as acid rain and bird droppings, etc., and after polishing, the car paint is also a certain protective effect.

Thin car paint, poor self-maintenance ability: in fact, car polishing is like a person removing the cuticle, once or twice is good, when the number of times, you will find that the ** is getting thinner and thinner, and even can not withstand a little damage, the same is true for car paint, car paint is not regenerated, after layers of throwing, it will only become thinner and thinner, and even lead to the phenomenon of car paint throwing through, and too many times of polishing will also lead to the original self-maintenance ability of the car paint to deteriorate, the hardness will also deteriorate, it can withstand a small pebble, Now it can only withstand a small grain of sand.

The advantages of automobile polishing are: For the paint surface of the vehicle with oxidation, black hair and scratches, the oxides and corrosions can be thrown away to achieve the purpose of restoring the cleanliness of the paint surface; The benefits of car waxing are: Car waxing can protect the car paint, can give the car body varnishe, and play a role in waterproofing, acid rain, ultraviolet rays, anti-static and grinding and polishing of the car paint.