Chapter 50: Working on the Heart of the Engine
“Our BJ212 was originally designed to meet the needs of the army. It can also be regarded as a military vehicle. It is consistent with the research direction of the Vehicle Engineering Department of your Capital Institute of Technology.”
“This time the two units have joined forces to cooperate. I think this kind of cooperation deserves to be vigorously promoted.”
Zheng Haiming and Zhu Jiansheng chatted for a long time, and also chatted with Dai Fuquan and other professors. The assistant professor communicated for a while and then left the clay model making room with satisfaction.
The exterior design plan created by Jiang Hui has officially passed the first round of internal evaluation at the Capital Automobile Manufacturing Plant.
Next, you can start preparing to make a 1:1 clay model.
However, just as Jiang Hui was communicating with Chen Chenxing, Dai Fuquan and others about the production of clay models, a team from the Capital Internal Combustion Engine Factory, led by chief engineer Cheng Tao, came over to talk to Zhu Jiansheng and Jiang Hui AC engine upgrade.
During the previous meeting, Jiang Hui said that he had some ideas to increase engine power and reduce fuel consumption, but he never had time to communicate with people in Shouchi.
Cheng Tao and the others also want to work harder to see if they can solve this problem in their own factory.
However, in the end, the people in the design office had no clue at all, so they had no choice but to look for Zhu Jiansheng and Jiang Hui.
"Professor Zhu, Liaison Jiang, this time we are coming to you for help."
Cheng Tao's attitude was relatively low, after all, he came here to ask for help today.
"Mr. Cheng, you are so polite. There are too many things going on these days. Otherwise, I would have planned to visit your factory to learn."
Jiang Hui's words are not entirely true. Kind words.
Although the engines currently produced in Shouchi are not very advanced, it will be a troublesome thing if some of the modified parts cannot be produced by the other party without going to the site to take a look.
When engineers from various car companies in later generations designed parts, they rarely considered whether the parts would not be manufactured, but only considered whether the performance met the requirements.
But in China in 1978, many auto parts could not be produced domestically.
The most obvious one is the ECU (engine control unit) used in electronic injection engines. This is mainly produced by several parts giants such as Bosch, Denso, and Hitachi in the world. Huaxia is a supporting company that can produce ECUs. The factory can't be found.
At least in the short term, if Jiang Hui designs an EFI engine, he will not be able to produce it.
In this way, the engine used after the BJ212 upgrade will definitely have to be a carburetor engine.
"I heard that you have already designed the appearance of the model after the facelift."
"There are many parts at the Capital Auto Parts Factory and they already have clear development ideas."
>"Needless to say, the Capital Gear Factory is already preparing prototypes for its 4MT."
"But our engine has no clue of improvement yet, and I am worried."< br>
Cheng Tao's words were really not polite, he was really worried.
Back then, when the Capital Internal Combustion Engine Factory produced engines, they simply used other people's drawings for production and had no development capabilities of their own.
Now we have to ask them to develop a new generation of engines. Wouldn’t this cost their lives?
"Xiaojiang, haven't you already had some ideas on improving engine power and reducing fuel consumption?"
"Chief Engineer Cheng and the others happened to be here today, let's have a good exchange. ”
Zhu Jiansheng also hopes that this project can become more successful, which will be very beneficial to him personally and Jiang Hui.
Strictly speaking, China has not truly completed its own designed passenger cars.
Even the previous "Dongfanghong" sedan and "Jinggangshan" sedan had some innovations in the body.
The engine and gearbox still use Polar Bear technology. Now we have to start working on the most critical component of the engine, which is naturally worthy of attention.
Cheng Tao and the others also came well prepared and brought over the assembly drawings of the BJ212 current engine and some key components.
There is a big pile full, and it seems that I am planning to have a good communication with Jiang Hui today.
“To upgrade the engine, we must first start with the carburetor.”
Since they came to communicate with each other in good faith, the project team really hopes that the engine upgrade can be completed as soon as possible. .
Jiang Hui definitely didn't play catch-up, he simply exchanged a few words and started to state his views directly.
The carburetor is something that people of later generations will find strange.
But now it is an indispensable part of the engine. Its important role in the engine can be called the "heart" of the engine.
The functional implementation of the carburetor includes starting device, idle device, medium load device, full load device and acceleration device.
Any problem in any place will affect the performance of the engine.
“The dual-chamber carburetor we are using now is a product developed by Polar Bear in the 1950s, and there is a clear gap between it and the world’s mainstream level.”
“We want to increase the power. , to reduce fuel consumption, the first step is to redesign a carburetor. ”
As Jiang Hui spoke, he came to the blackboard, picked up a piece of chalk, and began to draw quickly.
"When I was in college, I studied this problem specifically and tried to design a four-chamber carburetor..."
Cheng Tao and others may not be familiar with other parts. But it is impossible for them not to know about the most important carburetor on the engine.
So as soon as Jiang Hui started to explain, they listened immediately.
This kind of professional component design makes it difficult for laymen to appreciate its beauty, but insiders can grasp the key points immediately.
Just like when Jiang Hui went to the Capital Auto Parts Factory to design a maintenance-free integrated wheel hub bearing, Tang Riyue and other experts were immediately impressed.
The situation with the carburetor is the same.
After listening carefully to Jiang Hui's introduction for more than half an hour, I finally had a preliminary understanding of the structure and working principle of this new carburetor, as well as the precautions during the processing and production process.
"Jiang Liaocheng, this carburetor increases the size of the throttle valve. Although it can increase the power of the engine, will it lead to an increase in fuel consumption?"
Although Cheng Tao has already I feel the evolution of this carburetor, but I don't understand some of its shortcomings.
"This problem is mainly solved by using multiple pipes."
"If the pipe is large, the inflation volume can be increased, but the gasoline atomization is poor; if the pipe is small, the gasoline atomization is better. But the inflation volume is reduced. "
"Multiple pipes are composed of several pipes with different diameters arranged one above the other and the larger one below. "
" The outlet is located in the smallest throat. When the airflow passes through, the air flow velocity in the small throat is high, and the vacuum degree of the throat is high, so the atomization of gasoline is better, which is beneficial to improving fuel economy. ”
< br>“The annular channel between the large throat and the small throat ensures that the carburetor has sufficient air charge to meet the power requirements.”
"In addition, when multiple throats are used, the gasoline sprayed from the main nozzle is atomized multiple times in two or three throats, thus better ensuring the quality of the mixture formed."
As Jiang Hui said, Cheng Tao and others were desperately recording over there.
This kind of opportunity to explain the design of components directly from the principle is very rare.
(End of this chapter)