Chapter 237 of the text establishes an automobile research and development center

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ps: cough cough cough ...... Brothers, I'm sorry, everyone should understand this when you see this, so please wait.

Chen Gengdao: "Female H is a more advanced automotive concept, is the abbreviation of noise, vibration and vibration roughness, vibration and ESS three English words, roughly speaking, it is a car to the whole vehicle noise, vibration and harshness control and management, in addition to the strength and life problems caused by vibration, salinity and aging of auto parts. ”

Du Sirui immediately said: "It's comfort." ”

"Comfort can be understood as a part of the female H project, but it is far from the whole story, so let's go back and find some foreign books and materials on female H, you can take a look at it then."

"Yes, yes." Du Sirui nodded impatiently.

Chen Geng is definitely the leading expert in automotive engineering in China, listening to him is always right, this is already the consensus of everyone within Runhua Industry, at this point, everyone automatically ignores Chen Geng's age.

The old man Xie Minsheng, who had not spoken much on the side, took the words with a smile and said: "Anyway, although the car-making ability of our Runhua business is a little worse, our company has been at the forefront of the country in terms of vehicle research and development, and the level is also one of the few in China. ”

Automotive engineering and car manufacturing is actually a lot of fun, and if all you want to do is a car that can run, it's actually quite simple. For example, the current Third Ordnance Repair Plant can do it. The only problem is that there are frequent problems. After the millennium, many domestic private car enthusiasts can basically hear a few cases of building a car by themselves, so as far as "making" is concerned, making a car is actually very simple, this thing can be defined by "a set of sofas, four wheels", but for an automobile manufacturing company, to do this step, in fact, a car is only 50% completed.

But if you want a good car, you need a good car that is reliable and durable. That's a lot of effort, verification of performance between individual components, overall performance, comfort, ergonomics, women, mean time between failures......

If the difficulty of doing 50% from 0 is 1, then from 50% to this, the difficulty is 100, and today, the 212 jeep in front of Chen Geng is the first step for Runhua Industry to explore to 60% without completing the first 50%.

This is a "**-type" 212 Jeep, although it still looks like a 212 Jeep on the outside, but except that the shell is a 212 Jeep shell, there is nothing else in common with the BAIC 212 Jeep.

The engine room is equipped with a Goldwind 680Q 2.2L inline six-cylinder gasoline engine produced by SAIC Engine Plant. However, Runhua Industrial did not continue to use the dual-chamber carburetor on the Goldwind 680Q, and instead used a set of six carburetors in parallel for a fuel supply system. As a result of these improvements, the engine, which originally had a maximum output of 90 hp and a maximum torque of 160 Nm, has been increased to 102 hp and 175 Nm of torque.

In terms of transmission system, since the 2.5L inline four-cylinder gasoline engine engine of Beijing Internal Combustion Engine Factory is not used, it will naturally not use the four-speed manual transmission and transfer case, this new 21 Jeep is also used on the Shanghai SH760A The four-speed manual transmission, see this, many friends want to ask, what about the transfer case?

Indeed, this is a problem.

The gearbox equipped with the Shanghai sedan was not designed with the transfer case in mind, so there was no transfer case that could be matched, and the power came out of the gearbox and directly entered the rear drive axle, that is to say, the 212 jeep with the sturdy chassis girder of the hard off-road vehicle was actually a rear-drive jeep...... As for whether such a jeep that does not have four-wheel drive capability is still qualified to be called a jeep, there has been a lot of debate within Runhua Industry before.

The final result of the discussion was to develop a transfer case that could match it in the future, but before the transfer case that could be matched was developed, we first made a "two-wheel drive" version of the 212 Jeep.

The transmission system is almost "new", compared with the power system and transmission system, the suspension system is directly replaced by a person, the "classic" suspension of the front and rear hard shafts and leaf springs is gone, and it is replaced by the classic front and rear suspension of "front MacPherson independent suspension + rear torsion beam semi-independent suspension" that has been scolded by countless people a few years later.

This plan was determined by Chen Geng's insistence, according to Du Sirui's team's complaint, that is, "the front MacPherson plus the rear torsion beam, is this the suspension that the off-road vehicle should have?" ", in their opinion, a sedan that walks on a paved road all day can be suspended with such a "soft collapse", as for the off-road vehicle? It should be a hard bridge hard horse with front and rear hard axles and leaf springs, as for comfort...... Ahem, that's what an off-road vehicle should think about?

But in the end, they were persuaded by Chen Geng, and Chen Geng's reason was also very good: "Since this is a comfort-oriented rear-wheel drive jeep, why don't we go one step further in terms of comfort?" Otherwise, the off-road performance is not as good as the ordinary Jeep, and the comfort is not as good as the Jeep we modified, why do we let everyone recognize our products? ”

The reason was strong, and Du Sirui and their team were convinced: yes, the company had to make money from this car, although the car had only reached the P8 engineering stage, not the S stage......

Of course, thanks to this "classic" suspension structure, after canceling the transfer case and reducing the weight of the suspension system, even if the simple body is paved with soundproof cotton, the original weight of the 212 jeep with a weight of up to 1.5 tons has still been successfully slimmed down to 1.15 tons, using the Santana shock absorber is just right.

This is in line with Chen Geng's thoughts, before Runhua Industry signed a cooperation agreement with SAIC, SAIC will provide a certain amount of shock absorbers to Runhua Industry every year, but Chen Geng replaced the elastic elements of the suspension of the 212 Jeep from the coil spring of Santana to the torsion bar spring, and the shock absorbers sent by SAIC on a regular basis have been placed in the warehouse, considering the production capacity of this "improved" 212 Jeep, this batch of shock absorbers is just the best use.

With the roar of the engine, Chen Geng galloped up on this improvised simple test site, and he carefully felt the changes in this car: well, there is no power assist system, and the steering wheel is still sinking to death, but through the re-establishment of the steering feel, the directivity of the steering wheel is finally not blurred like a dough, although it is still flickering, it can finally be described by the word "directivity";

The cooperation between the power system and the traditional system is also good, but the noise is a bit loud;

Although the chassis, doors and roof are covered with sound-insulating cotton, this method of soundproofing is too rudimentary, and the filtering of high-frequency noise is good, but the filtering of low-frequency noise is terrible, but it is much better than the 212 Jeep, which has no soundproofing measures at all;

In addition, the noise of "woo woo woo ......" when the propeller shaft rotates at high speed is still quite harsh;

However, the improved cooling system is not bad, and I ran on the throttle in low gear for almost 10 minutes, right? But the water temperature is still good, and it seems that the replacement of the large-area radiator and the higher speed cooling fan have played a big role......

While running on the field, Chen Geng silently remembered these problems in his heart, which needed to be further improved in the future.

……………………

Before the car could stop, Du Sirui couldn't wait to rush up and asked eagerly, "Manager Chen, how is this car?" ”

"Overall, it's a big improvement over the 212 Jeep." Chen Geng nodded and said.

"Hehe...... Du Sirui grinned instantly, and laughed excitedly: After working for so long, he can get such an evaluation from Chen Geng at this moment, and he feels that his hard work during this time is finally worth it.

"Don't be busy rejoicing, now this car is actually P8 stage, you are hand-assembled little by little, it is still very early from the official production, it is not easy to say whether this quality can be guaranteed after the official production," At this time, Chen Geng poured a basin of cold water on them very unexpectedly: "Also, I found a lot of problems when I just tested the car, the noise of the transmission shaft is still too obvious, not only harsh and very rough, but also the overall female H is simply a scumbag ......"

Du Sirui and the team he led were listening carefully to Chen Geng's questions, but when they heard the English name of female H, their eyes suddenly lit up: "What is female H?" ”

Chen Geng realized that he had missed his mouth, although the world's cars have always attached great importance to the comfort of the car, and the comfort is the core concept of the formal VNH project, but the concept of female H is still very cutting-edge, domestic automobile companies basically do not understand, even FAW, the understanding of female H is limited to "comfort", yes, the goal of female H is to improve the comfort of the ride as much as possible, but female H is not just comfort can be described by such a word, this is a fairly rigorous system engineering, There needs to be a large number of jù to do support. (To be continued.) )