"The electric motor solution is really a trend." Qin Zhenhua couldn't help but sigh again: "I remember that during World War II, Dr. Porsche in Germany had designed electric tanks, but unfortunately the technology was immature at that time, so the last one
Tiger tanks use conventional solutions.”
Qin Zhenhua is engaged in military industry, so he always told the military industry that when he heard Qin Zhenhua say this, Gao Jiachen on the side said: "Yes, the plan at that time was to use fuel engines to generate electricity, and then use the electric energy generated by the generator to drive it.
Vehicles, now, have this kind of solution.”
There are also such solutions now, such as railway trains, which use this solution. The biggest advantage is that they eliminate the mechanical transmission system. Otherwise, high-power transmissions will be very complicated. Qin Zhenhua is thinking about this, but
Unexpectedly, what Gao Jiachen said was something else.
"These solutions are to make the engine work in the optimal range, thereby reducing energy consumption. There are solutions for cars and trucks." Gao Jiachen said: "However, it is still unknown whether these technologies can really save fuel.
”
"Ships and trucks are also using this method?" Qin Zhenhua asked strangely.
The country's requirements for exhaust emissions are getting higher and higher, and at the same time, the requirements for vehicle fuel consumption are getting higher and higher. In the past, the fuel consumption of the Santana of the old carburetor could be within 100 kilometers and ten liters.
Later, it was replaced with an electric injection engine, and the fuel consumption often exceeded 12 liters. However, no one despised the car's fuel consumption at that time. In the 1980s and 1990s, people were able to spend more than 100,000 or even more than 200,000 yuan to buy a car.
, How could you care about the more than three liters of gasoline? With the salary of an ordinary person, it takes ten or even twenty years to afford it.
But after that, ordinary people can buy a car with one or two years of salary, and even buy a car with zero down payment. The consumption capacity of these car owners is very poor. If the oil price rises slightly, they complain that they can't afford to add fuel.
The fuel consumption requirements of cars are getting lower and lower, so there is a need for new ways. In addition to the electric motor solution, there is also this unique operation. When hearing this solution is used in cars and trucks,
An indecent word even appeared in Qin Zhenhua's mind, which was simply taking off his pants and farting.
The reason is also very simple. The engine directly drives the vehicle, that is, it just passes through some gears. The gearbox and differential all have gears. Generally speaking, a pair of gears consumes about one percent of the power.
Therefore, if the engine power is transmitted to the wheels through the transmission and the differential, the power loss is about 5%. Of course, this depends on the training. Some transmissions are not powerful, and the transmission efficiency will be lower.
.
Now, the power of the engine is used to generate electricity, so the efficiency of the generator is not high. The efficiency of the large generator used in large hydropower stations and thermal power stations may reach 95%. However, small generators,
The efficiency generally does not exceed 90%, and if the current is transmitted to the motor and drives the tires, the efficiency will not reach 90%. With such a comprehensive, the overall transmission efficiency is 80%.
Left and right, this is much lower than directly using the transmission to drive. Isn’t it just farts and takes off my pants?
This is a waste of time.
"Yes, this is a research direction. The main problem is the best economic speed range of our engine." Gao Jiachen is very familiar with these. He said: "The best speed range of many engines is in three
It's about 4,000 rpm, but many drivers nowadays are reluctant to step on the accelerator when driving, and they often only have about 2,000 rpm. Therefore, the engine is not in the optimal range and the fuel consumption is high, because of the long-term low speed.
The fuel consumption is very high when driving, especially in urban areas, when stopping and stopping. This new solution is to adapt to this road condition. After starting, its engine works in the best range.
The car's battery provides power. After the battery is fully charged, it can turn off the engine and use the battery to drive the vehicle. In this way, the engine almost does not have to work during the road conditions of the car, and of course it can save fuel. However, these
They are all ideal, and the actual situation depends on the specific situation. However, if you use this kind of car to run on the highway, it will definitely cost fuel."
Different cars have different usage occasions. This design idea is to target urban road conditions. If it is used to run highways, the engine will have to be started continuously and cannot directly drive the car. It has to convert energy into electrical energy.
, this way, the transmission efficiency is low, and an additional battery is also carried, etc., so it is definitely more fuel-intensive. Although the fuel engine is eliminated, that will happen a long time later, the fuel car,
There are other ways to continue to extend the life. Carrying out electrification is one of the aspects.
Qin Zhenhua couldn't help but ask: "So, can we directly drive the vehicle at high speed?"
At high speed, the transmission efficiency is low, which leads to fuel consumption. Therefore, it is better to drive the vehicle directly at high speed.
"In this way, the car will be even more complicated. In addition to electric drive, it also needs to be directly driven by the engine. Especially when the power switches, if the matching is not good, the car will definitely be stuttered, and such a car will be uncomfortable. Technology
It will be more difficult." Gao Jiachen said.
These are two different ideas. The former engine only generates power and has a single work, while the latter engine also needs to drive vehicles and generates power. It is too difficult to switch and match each other. Therefore, Gao Jiachen explained these technical difficulties.
Obviously, he is very good at these things.
Qin Zhenhua nodded: "You have a lot of knowledge. If you go to our first-machine factory, it will be a waste. Do you really decide to join our first-machine factory?"
Gao Jiachen nodded: "Of course, my determination remains unchanged. Moreover, the first machine factory also has a car branch, and maybe this knowledge can be used in the future."
Although Gao Jiachen is familiar with this knowledge, it is all common sense. If you want to study it specifically, it will definitely involve more issues. He has not conducted in-depth research. Besides, even if you want to study it, there will be a future machine factory.
Opportunity.
Qin Zhenhua nodded. He had to keep pace with the times, so he also needed to develop these things in the future.