Questions and answers about basic car knowledge 3

Questions and answers about basic car knowledge 3

71. What does the word "box" of a three-box car represent?
The so-called three boxes. The simple description of the two boxes is how many independent and uninterconnectable spaces in the body (the meaning of intercommunication can be interpreted as being able to pass through), such as the engine compartment usually takes up a space, which is The box used for riding is another box.If it is an RV, the luggage is also another box, so the RV is usually called a three-box car.If it is a back car (such as Vichy) or MPV, because The luggage space and the passenger space are completely connected, so it is called a two-box type.
72. Will the safety airbag harm the person wearing glasses after being impacted and inflated?
The intensity of the impact of the airbag on the face is a complicated problem.The airbag inflates quickly.If you sit too far, without the seat belt buckled, the face and the airbag are inflated during the crash. The impact is very fierce. On the contrary, with the protection of a seat belt and a proper sitting position, the face hits after the airbag is fully inflated. The strength mainly depends on how hard the crash is, but the weight of the human body is inertial, rushing forward The speed will not increase rapidly in a short time, so the impact on the face should not be too large.
About two or three years ago, we got a safety airbag operation principle and test report made by Toyota, and it also mentioned whether people wearing glasses will be damaged by the impact of the safety airbag. And the person wearing glasses will not injure the eyes when the airbag is inflated, but there is no detail about the damage of the glasses and the face of the dummy wearing glasses after the test. The information only emphasizes that the airbag is a seat belt Other than auxiliary safety devices, seat belts are the most important protection, so the test is carried out with the seat belts on.
However, there are cases that even if the seat belt is buckled, there is still a chance of eye injury.In any case, when driving, you still have to remember to adjust the proper seat posture, buckle the seat belt, and wear unbroken. The fiber lens should have a little more protection. As a driver wearing glasses, all these can be done.
73. What is the use of the differential lock for 4WD?
When the car turns, the speed of the front and rear axles are different.The central differential of the four-wheel drive distributes the power according to the different speeds of the front and rear axles, but the disadvantage is that if one of the axles or one wheel loses grip, the whole car The power of the center will be transmitted to the single axle or the wheel that has lost grip.The role of the central differential lock is to lock when necessary, to ensure that the front and rear axles have fixed power in any case.
74. What are the benefits of raising the body of the off-road vehicle?
Raising the car is naturally good for climbing off-road, and the raised body can conquer more rugged mountain trails.
75. What causes the steering wheel to often tremble at a certain speed?
The steering wheel oscillates at high speeds. The most common reason is that the tires are unbalanced and you need to check the tires. If the wheels are properly balanced and the tires have been adjusted according to the owner's manual, the tires are not abnormally worn, please check the tire air pressure, such as air pressure If they are normal, it may be that the bearing bracket connected to the steering mechanism and the body is damaged. If the steering wheel vibrates afterwards, then it is the suspension system (including the tire ruler) that has a problem, find a maintenance technician to check.
76. Every time when the air conditioner is activated, there will be a strange noise at the tuyere, and the louder the noise will be, the bigger the noise will be.
It is likely that the belt connecting the engine and the air-conditioning compressor (air-conditioning spring) is loose.It slipped on the pulley and made a sharp squeak when pan-starting.The frictional force increased after heating, enabling the air-conditioning spring to be driven, so the air-conditioning returned to normal .
77. Do you want to add a fire cow with a white light on the front of the car?
The so-called white light lamp refers to a lamp bladder that has a higher working temperature and emits a whiter light.Some parts still use the design of traditional filaments, but use different metal filaments and special inert gas protection filaments, so that it can be used at higher temperatures. Work produces white light. This design does not require special equipment, just remove the old lamp and replace it directly. However, another white lamp uses the arc-type lighting principle without a filament. It is necessary to use a transformer commonly known as Huoxiu to raise the 12-volt voltage of the automotive circuit to nearly 20,000 volts, and arcs and strong light will be generated between the two electrodes in the lamp bulb.The lamp bulb of this design has stronger luminosity and is more durable. The price is more expensive.
78. If it is estimated that the driver will not be used for a long time (more than one month), what should be prepared for the car /
In addition to the loose battery, you must also charge the tire with at least five pounds of air pressure to prevent the tire from leaking and damaging the rim. You must also fill with gasoline to prevent the cylinder from rusting. However, this does not guarantee that you are The engine can be successfully started after a month, because the battery that is not connected will also leak. The best way is to ask a friend to start the engine every week, and better yet, drive a few kilometers after each start.
79. When there is an incoming call (phone) while driving, the sound will make a (squeak) sound, is there a way to solve it?
To solve the interference caused by mobile phones, it is best to use the phone antenna outside the car.At present, some new products can be easily installed by themselves without complicated wiring, you may wish to find it in a large mobile phone equipment store.
80. What is the role of crude wax?
Coarse wax is usually used as the first layer of wax on the paint after the body is sprayed.Its brightness is not high, but it has the function of protecting the paint.After the rough wax is dried, it will be polished with young wax to complete the whole body renovation process. .
81. Does the new car not use detergent and ordinary hair to clean the dirt of the body?
There should be no problem with the use of Maojin, but it should be noted that if you use inferior Maojin, the cotton thread may fall off and attach to the body.As for the cleaning agent, you must choose it carefully.
82. Will installing the sunroof destroy the structural strength and robustness of the car itself?
The addition of a sunroof will more or less weaken the rigidity of the body.Generally, car manufacturers have taken this problem into account during design, so some models will not launch the sunroof version because the body rigidity problem has not been solved. Therefore, we do not recommend After customers buy a car, they go to the modified shop to install a skylight.This is not only because their QC is not as rigorous as the original factory, which is easy to cause water leakage for a long time, but also because the body rigidity will be weakened.
83. Is there any way to become a professional racer?
To become a professional racing driver, it is usually started by amateur drivers.If the results are outstanding, there will be a team of professional drivers.For example, you can go to Zhuhai, where the Formula Campus racing is a way to enter the racing world.
84. After starting the engine, is it normal for the ABS lamp to light up?
The normal ABS light will light up when the engine is started, and the automatic check is completed.If the system is normal, it will go out.On the contrary, if the ABS fails, the light will be on.

HDI PCB or High density interconnect PCBs are a way of making more room on your printed circuit board to make them more efficient and allow for faster transmission. It's relatively easy for most enterprising companies that are using printed circuit boards to see how this can benefit them.

High density interconnect (HDI) PCBs represent one of the fastest-growing segments of the printed circuit board market. Because of its higher circuitry density, the HDI PCB design can incorporate finer lines and spaces, smaller vias and capture pads, and higher connection pad densities. A high-density PCB features blind and buried vias and often contains microvias that are .006 in diameter or even less.

The copper is the circuits material and the circuits designed by the PCB designers. Depends on the current in the circuits, the PCB copper thickness could be done with 0.5oz-10oz. But the PCB designers need be noted that the copper track width/space need be enlarged with the thickness. For example, the minimum copper track width/space could be 3mil/3mil with 0.5oz, but would be 4mil/4mil with 1oz.

The PCB board could be rigid PCB, could be flex PCB and also could be Flex-Rigid PCB. And the materials could be FR4, PI, Aluminum, Copper-based, Rogers, Teflon, etc. They have different applications. For example, FR4 PCB is the most commonly used for rigid PCB and almost good for all electronics products; PI is the most commonly used for flex PCB; Aluminum and copper-based have good thermal diffusivity and always used for LED PCB ; Rogers PCB and Teflon PCB are always used for High Frequency PCB, etc.

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