Set sail1992

Chapter 1180 Zhang Qihang's Plan B
"Is that so..."

Zhang Qihang thought for a while, and asked Li Gong, "Then Li Gong, what do you mean, do we use 6AT as a backup on the basis of our parallel shaft gearbox, or turn around and use dual clutch?"

"This one……"

Zhang Qihang's question stunned Li Gong.

He really didn't think about it carefully. Just now, he felt that Zhang Qihang's idea was too radical. Such a big company should at least have a back-up protection to ensure that if Zhang Qihang's idea fails, there is a backup And the bottom line, but he really didn't think about whether to continue to make the parallel axis 6AT or turn the head to do dual clutch.

Seeing Li Gong's expression, Zhang Qihang knew that he hadn't thought about it carefully, but Zhang Qihang was not surprised: the idea was just proposed by himself, and it is completely understandable that Li Gong didn't think of so much for a while.

"Speaking of which, Li Gong, what you said makes sense," Zhang Qihang said, "It's not bad to have a back-up plan, but I have an idea..."

Li Gong's spirit was shaken, and he quickly said, "Say it."

It would be great if Zhang Qihang had an idea.

"We have been cultivating parallel shaft technology for so many years. We need technology, patents, patents, and experience. Since it is just a backup plan, I think it is best to continue to develop parallel shaft gearbox technology," Zhang Qihang Said: "The biggest problem with our parallel shaft gearbox is that compared with the planetary gearbox, the mechanism reuse rate of the top shaft gear mechanism is too low, so I think your next work can be divided into two steps. The first step is to build a six-speed parallel shaft gearbox first, and then find ways to increase the mechanism reuse rate, use the arrangement of clutches to combine multiple gears, try to realize the reuse of gear mechanisms and clutch mechanisms, and at the same time find ways to reduce costs.

In this way, when competitors launch gearboxes with 6AT or more gears, we can also take the lead. We also have a lot of export customers, and these new gearboxes can still be sold to our old customers. "

Ok?
Li Gong's eyes lit up when he heard this, and he slapped his thigh excitedly: "That's right! Why didn't I think of that?"

As the person in charge of Huateng Group's gearbox field, Li Gong is naturally very clear that the biggest problem with the parallel shaft automatic gearbox is just like what Zhang Qihang said just now, that is, the mechanism reuse rate of the fixed-axis gear mechanism is too low, and the That is to say, 1 pair of gears and 1 clutch corresponds to 1 gear, and if you want to increase the gear, you must increase the number of corresponding gears and clutches.

The planetary mechanism is different. It realizes different manipulation sequences (gear combinations) through the combination of clutches and brakes. The mechanism reuse rate is very high. Each gear uses these planetary rows and these clutches, that is Different permutations and combinations can double the number of gears without adding too many mechanisms and without greatly increasing the overall cost.

Mr. Zhang is right. If the parallel shaft automatic transmission wants to develop further, it must learn the advantages of the planetary automatic transmission, find ways to improve the reusability of the mechanism, and increase the degree of freedom of the transmission mechanism. The same as the degree of freedom planetary gear mechanism, the multiple gears are combined with the clutch arrangement to realize the reuse of the gear mechanism and the clutch mechanism as much as possible.

Thinking of this, Li Gong responded again and again: "You are right, if we can find a way to improve the reuse rate of the organization, we can develop 6AT or even 7AT on the basis of 8AT..."

Zhang Qihang interrupted Li Gong with a smile, and said, "It doesn't matter whether it's 7AT or 8AT. The new parallel-shaft multi-speed gearbox is only plan B. Li Gong, you must understand that the next focus of your department is this E- cvt hybrid transmission, next you will develop versions with different power and different positioning on the basis of this hybrid transmission, for example, our Teana is about to be replaced, should we develop a hybrid that fits the positioning of Teana? system?"

Li Gong looked solemn, and nodded heavily: "Mr. Zhang, don't worry, I understand the importance!"

"That's good," said Zhang Qihang, looking at the car in front of him, rubbing his hands excitedly: "Stop talking, I'll try the car first."

Li Gong took a step back with a smile: "We are all waiting for Mr. Zhang to give us your opinion."

…………

After several laps, Zhang Qihang was a little surprised: the maturity of this gearbox is much higher than he imagined.

As an engineering prototype, Zhang Qihang didn't have high expectations for the performance and calibration of this E-cvt hybrid transmission before, but after driving these few laps, Zhang Qihang found that this E-cvt hybrid transmission The maturity of the automatic gearbox is already very high, and no particularly obvious problems have been found.

Of course, there are still some problems, such as the fuel consumption is still a bit high, and the power connection under various working conditions is not particularly smooth, and there is a little bit of frustration. These are because the collaborative calibration of the power system has not been done well, but in other words Come back, this is just an engineering prototype, with such performance, what else do you want?
Getting off the car, Zhang Qihang happily said to Li Gong: "Not bad, really good, you can adjust an engineering prototype to this level, Li Gong, it shows that the foundation you have laid for this gearbox is real. Very good."

Hearing Zhang Qihang's praise, Li Gong also breathed a sigh of relief, with a smile on his face: "Everyone really put a lot of thought into this gearbox..."

Speaking of this, Li Gong paused slightly and said, "Mr. Zhang, you just said that you plan to develop a series of gearboxes based on this gearbox?"

Hearing Li Gong's words, Zhang Qihang understood that Li Gong had an idea.He immediately said: "Li Gong, if you have any ideas, just say it."

Hearing this, Li Gong was not polite to Zhang Qihang, and said directly: "The maximum power of the driving motor of this E-cvt transmission of the Stealing Oil Prius is only 50 kilowatts, and the power of our electric motor transplanted from the current hybrid Sylphy It’s all 100 kilowatts, and the cost has increased a lot, Mr. Zhang, can we reduce the power a little?”

"Reduce power?"

"Yes," Li Gong replied, "At the same time, it also reduces the cost of the entire gearbox."

Zhang Qihang naturally knew that what Li Gong said was reasonable. The cost of a 50-kilowatt motor must be cheaper than that of a 100-kilowatt motor. He nodded and said, "Then how much do you want to reduce?"

"My idea is that we divide the hybrid transmission into three different versions: compact car, mid-level car and medium-to-large car. This 100-kilowatt transmission can be used as a hybrid transmission for mid-level cars. For the gearbox used above, the maximum power of the electric motor is 65 to 70 kilowatts. As for the hybrid gearbox used in the new generation of Fengya Teana in the future, it can reach 130 to 150 kilowatts.”

Zhang Qihang thought for a while, and then nodded cheerfully: "I think it's okay, you can discuss it later, and let me know after you have decided on the plan."

"Don't worry."

Li Gong nodded happily.

It was Zhang Qihang, who slapped his forehead when he said this: "By the way, speaking of this, we still use nickel-hydrogen battery packs in this car, right?"

"That's right, it's a Ni-MH battery." Li Gong was a little puzzled why Zhang Qihang asked this question suddenly: "Why? Is there anything wrong with this?"

After several years of use and verification, everyone is very satisfied with the safety and charging and discharging performance of Ni-MH batteries. Li Gong doesn't quite understand, what does Mr. Zhang suddenly ask this question?
Zhang Qihang waved his hand and signaled Li Gong not to misunderstand: "There is nothing wrong with it, but the energy density of nickel-metal hydride batteries is too low. Mr. Wang of Yadi Battery told me about their company's lithium iron cobalt phosphate. The energy density of the battery cell has reached 80Wh/kg, and the energy density of the battery pack is almost 65Wh/kg, which is much higher than the energy density of the Ni-MH battery pack. I think you can test the lithium iron cobalt phosphate battery as an energy storage system."

"The energy density of a single battery is 80Wh/kg?" Li Gong's eyes widened in surprise: "Is it true?"

The energy density of the battery cells of the nickel-metal hydride batteries provided by Yadi Battery to Huateng Automobile is 50Wh/kg. After the battery pack is assembled, the energy density of the entire battery pack is less than 35Wh/kg. The energy density of chromium batteries is much higher, but now, Yadi Battery can actually produce battery cells with an energy density of 80Wh/kg?

The energy density of the battery is improved, and the benefits are obvious. For example, the battery pack is smaller and lighter under the same power. The Ni-MH battery pack currently used by Huateng Group is the oldest and dead battery. The battery pack composed of lithium iron cobalt phosphate batteries can reduce the volume by at least 40% and reduce the weight by at least one third.

In addition to the advantage of high energy density, lithium-ion batteries have many advantages. For example, their charging and discharging speeds are much faster than nickel-metal hydride batteries. They are especially suitable for on-board energy systems that require fast charging and fast discharging. The life of the battery pack is also much higher than that of the Ni-MH battery. It can be said that the lithium-ion battery is the best choice for the vehicle energy storage system.

Now when Zhang Qihang said that Yadi Battery had come up with such a good battery, Li Gong was really overjoyed.

"Wang always told me that," Zhang Qihang nodded with a smile: "And this is based on the special requirements of our car, the specially designed power lithium-ion battery, and the lithium-ion battery used in mobile phones and laptops. The battery is not the same thing, if you are interested in this lithium iron cobalt phosphate battery, you can contact Mr. Wang."

"I will, such a good thing, I definitely can't miss it," Li Gong nodded repeatedly, and at the same time couldn't help complaining: "There is such a good thing, Mr. Wang should have told me."

Zhang Qihang laughed out loud.

Li Gong, however, was shocked when he thought of the cost of lithium-ion batteries, and quickly asked, "But this battery shouldn't be cheap, right?"

When Li Gong was worried about something, Zhang Qihang comforted him: "Don't worry about this, although it is more expensive than Ni-MH batteries, it is definitely within our tolerance."

Only then did Li Gong heaved a sigh of relief.

(End of this chapter)