You must know that Guo Qiulan's opening red envelope for every employee, including Meng Wentian, today is 88 yuan. After all www.biquge.info she gave all employees a year-end bonus and New Year's red envelopes a few days ago, and now the red envelopes are just a lively picture and a lip gloss. You must know that the red envelope of 88 yuan is not small, only the employees who go to work today have it, and there are not many people in Nanling County who can issue this kind of big red envelope. Giving a hundred to a beggar is absolutely unimaginable.

No one understands her behavior, and no one knows that she is distracted, so she casually drew a bill and gave it out, it can be said that the real culprit is Meng Wentian and not her.

But this farce had to be cleaned up by Meng Wentian, who went to the bank next to him to exchange three hundred yuan for brand new change, and then gave each beggar two yuan, and said all the good things before letting them leave.

Among the more than 60 people who participated in receiving the money, there were not only beggars, but also some lion dancers and stilt walkers. Their red envelopes were naturally much larger, but Meng Wentian didn't give too much, so as not to attract other people to join in the fun.

Looking at the factory gate that had quieted down again, Guo Qiulan, who was standing on the second floor of the office building, had palpitations, and glared at him fiercely several times regardless of whether Meng Wentian could see it or not.

Meng Wentian naturally didn't feel anything, and after sending away the spectators at the door, he went into the workshop to arrange for workers to repair the vehicles, check the list of parts and components they proposed, and put forward maintenance reference opinions on the vehicles that were difficult to maintain.

Now the technicians of the whole factory have recognized Meng Wentian's identity as a master, especially those who have jumped from other auto repair shops, and they are polite and respectful to this young man, not because he has the power to purchase parts, but because of his technical ability.

At the beginning, some technicians didn't believe that Meng Wentian's technology was better than theirs, and some deliberately asked Meng Wentian about the fault problems that they couldn't understand, and what surprised them was that every time Meng Wentian took a little look at it and put forward the right opinion, even if sometimes they doubted whether Meng Wentian was right, but when they waited for the official repair, they often found that the methods Meng Wentian said were the best and most correct.

As for Liu Wenbo, Zeng Ninghai, Wang Debao and others, not to mention, they have long been obedient to Meng Wentian, and even have a little more awe than those new colleagues, you must know that they witnessed Meng Wentian single-handedly beat the three main forces under the three poles to the point that they had no power to fight back, and slapped their colleague Li Xiaohua to the ground.

In the face of such a violent technologist, they are obedient or obedient.

After arranging the work of his colleagues, Meng Wentian did not participate in the maintenance of the vehicle, nor did he go to receive the faulty cars that came in from time to time to be repaired, but moved the brake system removed from Yue Mengjie's Fengtian Chiwei F car into the duty room and began to study it in a pretentious manner.

He had already arranged for a technician to disassemble the car, and only waited for Xu Sanfan to buy parts from the provincial capital or Jiangde City to replace and repair it.

Yue Mengjie's Fengtian Chiwei F car is well maintained, and the interior of the car is also very clean, except for some parts that are contaminated with brake oil and lubricating oil during disassembly, there are no other dirty things.

He took the brake pedal and brake support and looked at it, and muttered to himself, "It's just how much trouble you two little gadgets have made." ”

The design flaw of this car is in the brake pedal and brake mount, and the two parts connected by the rotating shaft are made of the latest alloy, which has many advantages such as light weight, high strength and simple processing. This alloy was later adopted by many automobile manufacturers and expanded to other auto parts, becoming a banner for Fengtian to adopt high technology, earning them enough eyeballs.

However, the structural designers did not pay attention to a detail, that is, when there is a high temperature difference between the pedal and the support seat, due to the reason of thermal expansion and cold contraction, the matching gap between the pedal and the support seat is reduced and the pressure is too tight, and the damping force of the pedal is greatly increased, which leads to the hidden danger of accidents.

If it is a rough man, a new driver, or someone who has only been driving this car for a short time, this hidden danger may be negligible, and it is difficult to cause a car accident, but those who are too cautious, or drivers who are used to driving this car, are prone to accidents. Outsiders don't understand the situation.

Why is that?

For men with thick lines and strong strength, they are not very sensitive to the strength when they step on the brakes, and they often kick down hard when they encounter an emergency, not to mention that just a little resistance is added between parts and parts because of the tight fit, that is, they are stuck with a little bit of small things, they can press the brake pedal with so much force, and they can press the brakes to death.

The same is true for new drivers, they step on the brakes in the course of the vehicle, pay attention to the speed of the vehicle has not decreased, will not experience the strength of the brakes, the speed has not decreased, and then pedal!

After all, it's just an increase in resistance, and if you really want to press hard, you can also achieve the purpose of braking. At most, these Madahars muttered in their hearts: Grass! This brake is so heavy.

People who are not used to driving this car are also largely unaffected by the increased pedal resistance, just like new drivers.

But for drivers who are used to this car, the problem is not so simple: they have mastered the habits of this car, and naturally they are familiar with the force of pressing the brake pedal. When they apply the brakes, they don't even need to know how much speed and how hard to use, when to apply the brakes, and how long to press......

All in all, everything is in the hands of these veteran drivers.

Especially when slowing down when there is a car in front of you, or when there are vehicles and pedestrians in front of you that need attention, their feet will involuntarily move from the accelerator pedal to the brake pedal, ready to tap the brake pedal at any time: the brake.

Yes, it is this "dot" that fully illustrates how familiar the old driver is with the state of his vehicle.

If you are a driver, you must know what "point brake" means, this kind of braking does not have to reduce the speed of the car significantly, but just let the speed of the car slightly slower, the driver will take further actions depending on the situation in front of you, sometimes the driver may immediately press the accelerator pedal to accelerate.

For example, when the car in front slows down and changes lanes, the driver behind often brakes first, and immediately overtakes the accelerator when the situation permits.

Back to the topic, for drivers who are very familiar with their car conditions, when they see the yellow light flashing in front of them or someone in front of them, they will naturally use their right foot to click on the brake pedal, this action is simply used to nature, no need to think, let alone deliberately control, just move the foot over and click on it, and some even immediately move the right foot to the accelerator pedal side of the virtual pressure.

The trouble arose at this time, because the temperature caused by the sudden increase in pedal resistance today, the driver's right foot according to the usual strength to point down, but the brake pedal was not pressed down as usual, or the distance pressed down was far from as long as the driver hoped, so the speed of the car naturally did not drop as he expected.

That is to say, the point brake does not play the role of braking at this moment, which means that the vehicle loses control at this moment.

If the speed of the car is not fast, this little time out of control may be nothing, the driver sees that the situation is not good and then makes up for it.

But when the speed is high, it is fatal, because the driver is used to his car and trusts his car so much that they have no idea that the speed does not drop as they expected.

When he sees that the situation is not good or the danger is coming, some drivers may panic and hurry, and some drivers involuntarily and habitually use the original strength to step on the brakes again, this time it may be because of the resistance of the pedal and still does not achieve the effect he wants, maybe without waiting for him to understand and then step harder, the tragedy has already happened.

However, the conditions for this car to suddenly increase braking resistance are harsh, even in winter, and only if the following conditions are met:

The car must be placed outdoors in the cold for a long period of time, resulting in a very low temperature of the car body (including the brake support seat), and the driver turns on the air conditioning after getting into the car, and does not wait for the car body to be warm, just the driver feels the temperature in the car, and he (she) drives the car away.

In this way, the brake support seat installed on the car body is still very cold at this time, and the outside temperature is about the same, and the brake pedal is relatively hot because it is in the car, when the temperature of the brake pedal is higher than the temperature of the brake support seat 20 degrees or more, this problem will appear - the damping force of the brake pedal increases.

Because it is rare for the damping force to increase, drivers who are accustomed to their own vehicles often cannot detect it, and because it is rare, it is difficult to replicate, and accident investigators cannot check it.

After an accident, not only does the car manufacturer not admit that it is a problem with the design of the vehicle, but the driver himself cannot figure out why the accident occurred, and often blames himself for improper operation and panic, and blames himself for not being decisive in dealing with it.

Just like Yue Mengjie, she thinks she is unlucky.

Even the Fengtian company itself did not find the problem for a long time.

What Meng Wentian has to do now is to calculate the force required by the driver to pedal under normal conditions according to the size data, material properties and mechanical principles of the brake pedal and brake support seat of the current Fengtian Chiwei F car, and calculate the mathematical relationship between pedal travel and force and braking effect.

After confirming that these relationships are correct, the temperature parameters, especially the temperature difference between the two, are added and the mathematical relationship between the pedal travel and the force and braking effect is calculated to deduce the inherent defects of the car.

The math is simple to say, but to understand it, you have to use the principles of mechanics at the university, advanced mathematics and fluid mechanics (the braking function on the wheels is done by the high-pressure oil output of the brake master cylinder, which brings the brake disc).