|||- >-> DVVT engine?

More than a dozen engineers present all showed puzzled looks on their faces, and even the two engine experts of the power transmission company were unfamiliar with the "DVVT engine" mentioned by Zhou Jingming, not to mention the rest of the engineers who did not know much about the engine, and they were even more confused about such a term.

"Chairman, is there a big connection between the DVVT engine you just mentioned and Honda's famous variable valve timing VVT engine?"

Zhou Jingming smiled and nodded, "You can regard the DVVT engine as a continuation of the VVT sub-engine, or a kind of progress." ”

The so-called VVT engine refers to an engine with variable valve timing technology. The valve phase of an engine has an important impact on its dynamics, economy and exhaust pollution. The optimal valve phase should allow the engine to be filled with the maximum amount of fresh air (flammable mixture) in a short air change time, with minimal exhaust resistance and minimal exhaust gas residue. When the engine speed changes, the optimal valve phase angle should also change because the speed of the air flow and the absolute time for the intake and exhaust valves to open and close early and late are changed.

But in fact, because the valve phase of the engine is driven by cams, and the early opening and closing angles of the intake valves are fixed, this can actually only make the engine in the best valve phase in a certain speed range, and when the engine speed is very low or very high, its valve phase will be in an undesirable state.

At low engine speeds, the valve stack angle is larger than ideal, so that part of the fresh mixture is carried away by the exhaust gases, resulting in increased fuel consumption and blowdown, while at high speeds, because the valve stack angle is smaller than ideal, the air intake is insufficient, thus limiting the maximum power that the engine can achieve. In order to improve engine performance, variable valve phase and valve stroke technology has become an important research topic in the field of automotive engine technology.

Variable valve timing technology was born in this context. This technology uses an electronic control system that can change the opening time or size of the valve, and enhances the balance of the vehicle's torque output, increases engine power and reduces the vehicle's fuel consumption by matching the vehicle with a more reasonable valve opening or closing time at different speeds.

Compared with the ordinary timing system, the engine equipped with VVT system can further improve the fuel efficiency of the engine, so that the engine has a greater probability of working under the best working conditions, and improve the power of the engine.

In 1989, Honda launched its self-developed VTEC, the world's first valve control system that can control both valve opening and closing time and lift. Toyota's VVT-i (Intelligent Variable Valve Timing System) and Hyundai's CVVT system were nothing more than a variation of Honda's VTEC system.

VVT technology has also become the hottest research technology in the current engine field, and it is the vane of future engine development.

"Can the chairman explain in detail the technical differences between the DVVT engine and the VVT engine?" said another engine expert, raising his hand. Although they have a certain understanding of VVT engines, they are not particularly clear, after all, the car companies in the island countries have always regarded this technology as a forbidden one, and it is impossible for Chinese automakers to get much useful information from them.

"To put it simply, VVT only realizes the timing adjustment of the intake valve, while DVVT can realize the dual adjustment of the intake valve and exhaust valve at the same time, making the engine more fuel efficient, but in fact, in terms of working principle, the DVVT engine is very similar to the VVT engine, and there is not much difference. Zhou Jingming explained with a smile.

In layman's terms, just like the human breath, being able to control the "exhalation" and "inhalation" rhythmically as needed certainly has a higher performance than just controlling the "inhalation".

At present, VVT engine has been used on a large scale in the models produced by Japanese and Korean car companies, these companies have basically formed a technical monopoly on this technology, Zhou Jingming has any idea of VVT technology, but dvvt as the most advanced kind of variable timing technology, Tianming Group must seize the rest of the companies before the invention patent!

DVVT technology will become the second core engine technology of Tianming Group after direct injection in the cylinder!

Of course, in addition to the above-mentioned VVT and DVVT, we can often see engine models such as CVVT, which is actually a type of VVT engine, but on the Kia side, in order to make it easier to distinguish, so it is called CVVT.

For the explanation that Zhou Jingming just made, the two engine experts also instantly understood that if the intake and exhaust valves of the engine can be controlled at the same time, then among the engines of the same displacement, the performance parameters of the DVVT engine must be the highest one!

"For a detailed introduction to the DVVT engine, after a meeting, I will arrange time for you to do a separate training. Zhou Jingming paused, then glanced at everyone again, "Is there any more questions?"

"Chairman, what about the gearbox?"

"The transmission is based on the original automatic manual transmission, and the transmission is upgraded to a six-speed automatic transmission. Zhou Jingming replied with a smile.

Since it is a luxury car, all the configurations should be required with high standards in order to meet the positioning of the "Yanhuang" car brand.

The technical requirements for the body, gearbox and engine have been decided, and the rest of the components will be discussed by the person in charge of each assembly of the project team to determine the final design plan.

This time, the "Yan Huang" sedan project kick-off meeting, lasted more than two hours before it ended, and after the end of this meeting, and the previous very confidential is different, this time, Tianming Group directly issued a statement in the afternoon of the same day, the company's next car, will enter the luxury car market.

This time, Zhou Jingming wants to play this game with these competitors with open cards!

In this statement, Tianming Group did not hesitate to add "Rolls-Royce" to the publicity, claiming that this upcoming luxury car will have the manufacturing process of Rolls-Royce, reflecting a different noble and elegant.

Immediately after this statement was issued, it caused a great sensation in the international automobile industry, and the media of various countries even used their own news networks in China to report the news.

"Tianming Group has entered the luxury car market, and the international automobile industry pattern has ushered in new changes!"

"BMW and Mercedes-Benz are facing strong rivals, where do European luxury car manufacturers go?"

…………

Not only these media, but also consumers in the market are also full of expectations for the luxury cars that Tianming will soon come out.

"Having just led the SUV trend and immediately laid out the luxury car market, Tianming Company is worthy of being the most successful car manufacturer in recent years. ”

"The same manufacturing process as Rolls-Royce, just thinking about it, makes people look forward to it. ”

"If you can't afford a Rolls-Royce, you should be able to afford this luxury car!"

Following the last acquisition of Rolls-Royce, Tianming Group has once again become the focus of the world's attention.