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"Hehe, okay, I'll explain this to you."

Jin Xiaoqiang pressed down with his hands unhurriedly, signaling the reporters to calm down, lest they faint in disappointment after he announced the answer.

"As we all know, in terms of diesel engines, everyone generally likes to use high compression ratios, because the ignition point of diesel is lower than that of gasoline, but if too low compression ratios are used, the temperature of the compressed air will be lower, which will make the engine of the diesel car difficult to start. And secondly, if the compression ratio is too low, even after the diesel engine is started, it will cause the warm-up rotation to be unstable, which is easy to cause the engine to be in a semi-dead fire state, especially in winter or cold climate areas, the diesel engine is not easy to start has always been a big problem. Therefore, at present, more and more diesel engine R&D enterprises are willing to use too high compression ratio. ”

Jin Xiaoqiang explained to the guy with a smile, and the reporters below were slandering, who doesn't know nonsense, since you guys know these characteristics of diesel engines, you still make such a low compression ratio diesel engine, is it just for grandstanding?

Are you really tired of being crooked, that is, you came to die in battle?

However, at this time, some reporters have already sobered up a little from the ecstasy just now, after all, Jin Xiaoqiang's performance in the past two years is obvious to all, he can't be so humiliated, is he preparing any other means to rejuvenate himself?

Made, is she going to be slapped in the face again?

It must be like this, the gasoline engine technology of Skyactiv that he just announced, it reflects this guy's very strong ability to think backwards, and now he is doing the opposite, this guy must have prepared something else that everyone didn't expect, and it seems that this time he can come back to life.

But fortunately, the question just now was not asked by us, and it was just a shame to be ashamed, that is, the German guy was just embarrassed.

At this time, some reporters who had reacted were already looking at the German reporter who was still in a state of excitement with sympathetic eyes, and it seemed that Jin Xiaoqiang would definitely disappoint him again this time.

I don't know if that guy will vomit blood and die when the plot is reversed?

However, everyone also knows that this high compression ratio diesel engine also has a disadvantage, that is, its combustion dead center and compression temperature will be very high. In this way, it is often caused to ignite before the diesel and air have formed a mixture of gas after the fuel is sprayed out by the injection device, and the final result of such a working condition is that oxygen and nitrogen compounds will be formed locally because of uneven combustion, and excessive nitric oxide and micro particulate matter (that is, the PM object known to everyone in later generations) will be formed because of premature combustion in the part of insufficient oxidation...... ）。 ”

What Jin Xiaoqiang said is the common problem of diesel engines on the market, and it is also the main reason why diesel engines are considered to be the image of underdeveloped tractors.

The premature combustion caused by the high compression ratio will make the noise of the diesel engine particularly loud, and the black smoke in the exhaust will make people think that the pollution of the diesel engine is great.

Moreover, if it is in a country like the Celestial Empire, where the petrochemical industry is not well, and the oil quality of diesel is very problematic, the vibration of such a diesel engine can be imagined.

The consequence of such a situation is that only a fool will buy a car with a diesel engine, after all, no one wants to drive a noisy, vibrating tractor and come back as a family car.

"That's why we've lowered the compression ratio of our diesel engine, which reduces the high temperatures and pressures that the combustion chamber is exposed to. And because the ignition is extended, the fuel and air can be mixed more fully, and the combustion can be more sufficient, so that the pollution emissions of carbon monoxide, hydrocarbons, oxygen and nitrogen compounds, and solid particles can be reduced. And because of the reduced compression ratio, our engine can also be injected near the dead center on the combustion chamber, burned, and because the oil and gas are more fully mixed, the workmanship efficiency of this engine will be higher than that of ordinary diesel engines. It also has the purpose of reducing noise and vibration. And at the same time, because there is no need for a high compression ratio, it also reduces a lot of requirements for the strength of engine parts, we can replace the cast iron material necessary for the original diesel engine with aluminum alloy material, so as to achieve the purpose of reducing the weight of the engine, so as to save more fuel, for example, the main journal diameter of the crankshaft of our engine has been shortened directly from the original 60~~ to the current 52M~~, which not only reduces the weight of 25%, but also reduces the mechanical resistance .......... …… Jin Xiaoqiang's explanation is to listen to the reporters' eyes breathing fire, young girl, who doesn't know the benefits of reducing the compression ratio of diesel engines.

It's not that you haven't done experiments in this area before, but in the end, it's because of what you said before, low compression ratio, difficult to start, and unstable combustion, etc., and in the end you can only choose to give up.

Now you're good, and Rory just said a lot of the benefits of this reduced compression ratio, but what everyone wants to know is, how exactly did you do it.

If you can't tell everyone that you're ugly, you're bragging!

"But how the hell do you manage to do that?"

Today's reporter can't help it, you must know that in the improvement of the diesel engine to force the force, they Japanese are a big master, the first to develop the direct injection technology in the cylinder, is their Japanese Mitsubishi, and it is also on the diesel engine to get out.

Even the direct injection technology in the cylinder that the Germans have boasted in recent years is actually just a diesel engine technology obtained from the Japanese, and then it is enough to be planted in the gasoline engine.

They also know the benefits of this low compression ratio diesel engine, but they have not been able to do it, and now Huayang Power has actually made it out first, how can they be strong?

And Jin Xiaoqiang looked at this little nose today, but he was thinking in his heart, fortunately you don't know this technology, it was originally invented by you, if you know, Lao Tzu wants to take a good look, what can you be angry about?

But now is the time to deal with them, and now I have to give some explanations to the reporters below.

"We have equipped this diesel engine with a variable valve lift structure, which is also placed near the exhaust valve, and its main function is to open the exhaust valve a little during the suction stroke, so that the exhaust gas in the exhaust pipe can flow back to the cylinder to increase the suction temperature, and at the same time promote the temperature rise during compression, so as to improve the stability of the engine during ignition. In addition, this engine is equipped with a multi-air pressure injection device, a new porous fuel injection device with multiple injection modes, which can accurately control the injection time and injection volume, and increase the mixing concentration of fuel and air. Moreover, this spray decoration can also be used for 3 times each of the front, main and rear sprays in one combustion, for a total of 9 sprays. At the same time, we also equipped this diesel engine with a ceramic ignition plug, so that it can ensure the normal start and stable operation of the diesel engine in a low compression ratio environment. ”

Jin Xiaoqiang explained the problems that many automobile manufacturers have always felt thorny in two words.

And the following reporters, at this time roughly understood Jin Xiaoqiang to solve the problem of low compression ratio of diesel engines, although it sounds like these technologies are very simple, but if you want to really do it, or solve this problem, these reporters know how much effort to pay.

These people pondered, so it seems that on this engine and diesel engine, this Huayang Power may have to pay a lot of price!

If it were to be replaced by those large automakers in Europe, the United States and Japan to develop such a project, even if it was selected for tackling key problems, I am afraid it would cost no less than a billion dollars.

After all, the cost of human resources in Europe, America and Japan is not low, but the situation in the Celestial Empire is completely different, but even so, I am afraid that Huayang Power will also spend a lot of resources and funds!

However, such a miracle can only happen in the Celestial Empire, because their human resources are really too abundant, that is, they can overcome such a project in such a short period of time.

After all, if you want to solve such a problem in Europe, America or Japan, if you can concentrate hundreds or even thousands of engineers to do it together like Huayang Power, I am afraid that this enterprise will have to go bankrupt.

It seems that this diesel engine is really 360 degrees without dead ends!

Many reporters who were slow to respond were already a little green at this time, especially the German reporter who was the first to jump out and criticize him, originally thought that he could see the big jokes of Jin Xiaoqiang and Huayang Power.

How could he think that someone would be a thousand pounds, but his punch hit the cotton firmly, and this time it really wanted to suffocate him from internal injuries.

And reporters who have long been mentally prepared can still feel barely acceptable at this time.

"At the same time, we have also equipped this diesel engine with two turbochargers, one large and one small, which will be supercharged with different engine speeds, so as to not only ensure high torque at low speeds, but also maintain high power at high speeds, and most importantly, reduce exhaust emissions and save fuel ......consumption." If you like this work, you are welcome to ◤◢ to vote for recommendation, monthly pass, your support is my biggest motivation. ）