All round car designer

Chapter 665 Driverless Tour (4)

Everything is ready, and the unmanned test will officially start.

Counting this time, Zhou Fei has participated in three unmanned field tests, so he is still very familiar with the relevant links, especially the last semi-autonomous driving test, which left a deep impression on Zhou Fei.

"I don't know what kind of surprise there will be this time?" Zhou Fei looked at the test track and said silently in his heart.

Although he has always believed in Ramsey's ability, after all, unmanned driving is an achievement that has not been truly realized in his previous life. Zhou Fei is inevitably a little nervous.

Soon, the four cars on the runway started up in their respective parking spaces in an orderly manner, and Zhou Fei's attention was all focused on the test vehicles at once. The test results this time will directly affect the next Down the drone tour.

The front straight-line driving, obstacle avoidance, acceleration and other operations are not very interesting. These functions have been achieved by Ramsey's team as early as a few months ago.

"It feels more stable and sensitive than last time." Zhou Fei said thoughtfully. These improvements can be said to be visible to the naked eye.

"We have updated the algorithm program inside the vehicle again, and the running speed of the CPU has also become faster. In addition, after fully accessing the Gaoteng map, the vehicle's navigation system is also more accurate, and the performance is naturally more stable. Ramsey explained with a smile, with a look of pride on his face.

Realizing driverless vehicles is also Ramsey's greatest wish. He thought it would take a long time, but the intervention of Zhou Fei and the Feichi Group undoubtedly gave Ramsey a pair of wings, which led to today's results.

During the conversation between the two, the four cars had already decelerated to a certain extent and were about to turn. Zhou Fei's eyes were fixed on the curve, for fear that he would miss any wonderful moment.

In the last semi-autonomous driving test, the biggest problem was the automatic turning of the vehicle. Not only was the accuracy unstable, but the process was even more thrilling. Zhou Fei, who was sitting in the car at the time, had a deep understanding. I don’t know that this time, Ramsey What kind of improvements will be made for this function?

The answer will be revealed soon!

The red Tesla Model X in the outermost lane started the turning procedure first. After the wheels turned an accurate angle, it only took a moment to drive through the curve easily!
Immediately afterwards, the second, third, and even the fourth Tesla passed the curve smoothly. The whole process seemed so natural that Zhou Fei didn't even feel it, and all four cars had already been completed. turn.

The whole process was smooth and smooth, without any mistakes!

"Not bad, not bad!" Zhou Fei nodded repeatedly.

Although it was only an unmanned test, compared with the last semi-autonomous driving test, this time it can be said that it has achieved a qualitative breakthrough, and it can be regarded as solving one of the biggest obstacles on the road to mass production of unmanned vehicles.

Ramsey smiled, "In addition to improving the algorithm, another highlight of this test is that we have also improved the steering system of the vehicle, or it may be more accurate to describe it as subversion."

steering system?

subversion?

Zhou Fei didn't speak, but looked at Ramsay with puzzled eyes.

"We removed the original steering system on the test vehicle and replaced it with the SBW system. What Mr. Zhou saw just now is that this steering system is working."

"SBW system... steer-by-wire system?" Zhou Fei couldn't help showing surprise on his face.

From the appearance of automobiles to the present, the steering system has roughly undergone three replacements. The initial loads were all mechanical steering systems. The biggest problem with this kind of steering system is that it is very laborious to use. fatigue.

The first batch of old jeeps that appeared in China were really difficult for ordinary women to drive, and it was difficult to turn around.

With the development of automobile steering technology, the hydraulic steering system came out naturally. Although this steering system has improved the disadvantages of the mechanical steering system to a large extent, there are still many problems.

As an upgrade of the hydraulic steering system, EPS, that is, the electronically controlled power steering system, was born, which is also the most widely used steering system on vehicles.

The SBW (Steering By Wire) system that Ramsey just mentioned, that is, the steering by wire system, is a new type of steering system that has emerged after the EPS system.

This kind of steering system has excellent system performance, which can greatly improve the safety, handling stability, energy saving and environmental protection of the vehicle. At the same time, it also has the advantages of relatively simple structure and light weight, which can greatly reduce fuel consumption.

The biggest feature of the steer-by-wire system is that it cancels the mechanical connection between the steering wheel and the steering wheel, supplemented by a road-sensing motor and a steering motor to realize the road-sensing simulation and steering operation of the vehicle.

The working principle of the system is also very simple. When the driver turns the steering wheel by hand, a corresponding torque and angle signal will be generated, and the torque sensor and steering angle sensor on the steer-by-wire system will capture this signal. signal, the two sensors transmit the detected signal to the electronic control unit ECU at the first time.

At the same time, the displacement sensor and vehicle speed sensor in the system will also send corresponding signals to the ECU. After the ECU synthesizes these electronic signals, it will send a corresponding steering signal to the steering motor through the built-in computer, and the steering motor will follow the instructions issued by the ECU. In this way, the vehicle will complete the steering operation in the direction envisioned by the driver.

Of course, the steering-by-wire system is not a new technology. This steering technology has long been used in the steering system of aircraft. However, due to various reasons, this technology has not been able to be transferred to automobiles. EPS is still the mainstream. Turn to technology.

Therefore, although the steering-by-wire system has many advantages that the EPS system cannot match, due to the immaturity of the technology, it has not been applied to vehicles. Even in Zhou Fei's previous life, only the Infiniti Q50 was the first car to eat. For the first time, Crabman installed the SBW system on the vehicle, which greatly enhanced people's confidence in the application of the steering-by-wire system.

However, due to its poor performance, the attempt of the Infiniti Q50 did not cause much sensation. In a sense, the steering-by-wire system is still in the immature stage of technology. Loaded, there is still a long way to go.

Zhou Fei didn't expect that this technology, which hadn't made a breakthrough in the previous life, would be in the hands of Ramsey, and it would go to the stage of real car testing without a sound, which really surprised him.

If it is possible to realize steer-by-wire on the basis of unmanned driving, it will definitely be even more powerful for the promotion of unmanned driving!
　I just finished the re-examination yesterday, I performed very badly, and I was a little confused, so the update is a bit late, and I want to say sorry to everyone.

　　
　
(End of this chapter)