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Liang Yuan's eyes were greeted by a huge thing similar to the sand table of the train, with mountains, jungles, towns, and a small railway station with the sign of Shengjing South Station, and the simulated rails at the far end of the railway station also divided into several turnouts, and then extended, and the simulated platform marked with Shengjing Platform 2 was merged into one after Guò.

The simulated rail lines have bridges and tunnels, the complex double-track railway outlines an incomparably complex geometry on this sand table, and the four train models are split in pairs, running on the simulated tracks, and many simulated signal lights that can emit red, green and yellow lights are set up next to the tracks.

"Xiaoyuan, that white train looks a lot like the double-decker coach we made. Ning Wanfei said.

"The train in front of you is running so slowly, will the fast train behind you crash into it?" Ning Wanjia was a little nervous and grabbed Liang Yuan's palm.

Four train model passengers, half of the freight car, just run a freight train and a passenger train on each simulated railway, each model train adopts a five-car group, and the head of the passenger marshalling and the carriage are also installed with light bulbs, which looks very imposing, but the freight marshalling model is very slow, and it is a lot slower than the passenger marshalling to the naked eye.

"I don't think I'll bump into it. Liang Yuan looked at the two formations that were far away from each other and said.

During the conversation, a freight model approached the Shengjing South Station on the sand table, Liang Yuan found that the truck ran to the line of the Shengjing 2 platform after the turnout and changed the track, and then slowly stopped, and after a while, the faster passenger car model drove through a platform, and waited until the passenger car went away. With the change of traffic lights, the freight model slowly starts again.

At first, Liang Yuan thought that the model was a fixed speed, a fixed program, and after looking at it for a while, he noticed that the Shengjing 2 platform used to avoid the rapid passenger marshalling had only one track, and there were indeed two trains of truck marshalling that needed to be avoided. The entire sand table is made according to the real railway signaling system, and once two wagons need to be avoided at the same time, the speed of one of the trains will gradually slow down. Until another train is vacated to be avoided, it is interesting to note that the freight group slows down and the passenger group that follows behind also slows down.

The two little girls looked at it for a while and gradually saw the doorway, Ning Wanjia pulled Liang Yuan's arm and said, "Xiaoyuan." This system is so complicated, I will faint just thinking about it, how can this be set up in advance. ”

Liang Yuan said with a smile: "This thing is not set up in advance, it is modeled after the railway signal system, Jiajia, you pay attention to the signal lights next to the tracks, so many signal lights on the sand table are not just for the sake of good looks, between every two signal lights is a group of occlusion sections, if the two cars are too close to each other, the signal lights in the rear car running section will turn yellow, and then the model will automatically slow down." ”

"Jiajia. Look at the model truck on the right, it's starting to slow down, and pay attention to the traffic light in front of him, whether it's turning yellow. Liang Yuan pointed to a train of model trucks and said.

"Look at the back of the truck, and get close enough to get a certain distance. The bus signal behind it will also turn yellow. ”

"Well, it's really turned yellow, Xiaoyuan is so powerful, I can see it in a while. Ning Wanjia blinked, looking at Liang Yuan adoringly and giving Ning Wanjia a look at her misty eyes, and Liang Yuan's bones were lighter. resisted the urge to hold the little girl in his arms, his rare old face turned red, turned his head and saw that Li Yuanling and Tang Wan were looking at the sand table intently, stretched out his hand to close Ning Wanjia's creamy face, felt the cold and soft feeling from the palm, and asked softly: "Jiajia, is it cold." ”

"No, no. Feeling Liang Yuan's soft gaze, Ning Wanjia's voice became slightly sweet.

Out of the corner of his eye, he found Su Liangyu and a few technicians on the other end of the sand table walking towards him, Liang Yuan gently patted Ning Wanjia's cheek and said, "Let's go into the tent in a while, Sister Wang Xin's system should show the movement of the model." ”

After greeting Li Yuanling and Tang Wan, Su Liangyu said to Liang Yuan: "How is it, Xiaoyuan, it's not bad." ”

"At present, Dingtian is a passing grade, and if you want to become good, you have to look at the control platform inside to know. Liang Yuan said with a smile.

"Xiaoyuan, your requirements are really high enough. Tang Wan said with a smile: "I can't even think of how to control such a complicated thing." ”

In the 80s, computers were downright high-tech, not to mention the highly professional chip automation control, that is, computer typing, in the eyes of ordinary people are extremely popular skills, except for a small number of professional people, ordinary people look at this and watch magic no difference.

"Since Aunt Ning said yes, I'll let them go, as long as it's almost qualified. Liang Yuan said with a smile.

Several people lifted the canvas curtain and returned to the backstage of the light group.

Wang Xin saw Liang Yuan coming back and asked with a smile: "Xiaoyuan, how is it, this light group is not bad." ”

"Sister Wang Xin, do you want to listen to the truth or lie?" Liang Yuan said.

"Xiaoyuan, let's be honest, I'm the person in charge of the project. ”

"This system is supposed to be modeled after the fully automatic stepped block system of the Japanese Shinkansen. Liang Yuan said affirmatively.

Looking at Wang Xin's somewhat stunned gaze, Liang Yuan smiled proudly.

"The name of this system is so long, it sounds very complicated, can Xiao Yuan say it simply" Ning Wanfei asked curiously.

"Fei Fei, let's make an analogy, for example, between the two trains of passengers and trucks just now, the distance between each two signal lights is a set of block sections, and these sections are numbered, when the passenger car is a certain block zone from the truck in front, the speed decreases with the approach to the truck. For example, if a train with a speed of 160 kilometers per hour is 6 sections away from the truck in front, the speed becomes 120, 120, 60, 60, 40, until 20, and then stops. And the control zhì is a qiē, which is the kind of square chip produced by the real yàn room. ”

"However, the sand table space in front is limited, and I don't see that the system is set to start decelerating in several intervals, but looking at the control monitor next to Sister Wang Xin, you should be able to know the answer. Liang Yuan pointed to the piece of equipment that was bigger than a billiard table.

After Liang Yuan's prompting. A few people completely figured out the principle of the sand table outside, Ning Wanfei looked at the controller and said: "These lines represent the railroad tracks outside, each light bulb on the line is a section, and the four blue dots are the four trains. ”

"It's a complicated system. Ning Wanfei said as she looked at the flashing and changing points of light.

Liang Yuan smiled at Ning Wanfei, and then said to Su Liangyu, "Old Su." This thing must have been made in January after talking with the signal experts of the Road Bureau, right?"

"I can't hide anything from you, I really don't know where you know so many things that are not next to you. Su Liangyu said.

"Wang Xin is still waiting for Xiaoyuan's truth, Xiaoyuan will talk about what is wrong with this system" Su Liangyu pointed to Wang Xin, who was looking at Liang Yuan.

"Huh. It's already surprising to me that I can do this, Sister Wang Xin wants to hear my praise. ”

"Xiaoyuan would have appropriated the funds for the whole year as early as possible. Wang Xin said with a smile.

"Then wait for Lao Su to tell me in June, Xiaoyuan. There is no money in the real room, you can do it," Liang Yuan asked in a relaxed tone.

"Su Gong, how can you be so unbearable as you say. Li Yuanling said with a smile Liang Yuan looked at Su Liangyu and said with a smile: "Lao Su, the system you got is a bit overkill for the domestic railway, in Japan, the biggest disadvantage of the automatic stepped block system is that it affects the performance of the train, after some small accidents, the train is very easy to be delayed, and due to the frequent acceleration and deceleration of the train, the riding experience of the Shinkansen is not comfortable." ”

However, in China, the biggest disadvantage of this system lies in the acceleration performance of the domestic traction head and the braking performance of the full train. It is difficult to meet the high acceleration and deceleration requirements of this system. I remember that the spacing of trains on the Shinkansen in Japan was within 2 km, what is the current spacing of ours, it should be at least 6 km or more. The Dongfeng locomotive takes a distance of ten minutes and twenty kilometers to accelerate from sixty kilometers per hour to more than one hundred kilometers per hour, while Japanese Shinkansen trains go from one hundred kilometers per hour to two hundred kilometers per hour. It takes less than three minutes and a distance of four kilometers. ”

"This system is of great significance to the improvement of the safety factor of domestic railways and the realization of electrification (Note 1), but before the domestic traction head is not substantially improved, there is not much room for the real performance of the system, and it is temporarily a showcase. Regardless of the speed factor, the same railway line. Japan has three times as much capacity as we do, and at least six times as much when speed is taken into account. Liang Yuan said with some sighs.

"Listening to the railway signal experts, this system is currently first-class in the world, but it almost became worthless here in Xiaoyuan, but fortunately, Xiaoyuan did not go to the symposium in January. Su Liangyu said with a smile.

"But Lao Su, if you get this set of things out, you should be eyeing the electrification transformation project that the Ministry of Railways is currently vigorously promoting," Liang Yuan asked with a smile.

Su Liangyu laughed and said, "Let you say this, where do I dare to have such thoughts."

After more than half a year of contact, Wang Xin also knows Liang Yuan very well, listening to Liang Yuan say this, he asked with a smile: "Generally speaking, Xiaoyuan is not satisfied with something, it must be better in his heart, and now I am curious about what something better than this world-class railway signal control system will look like?"

After listening to Wang Xin, Liang Yuan remembered that in the future, the world-famous CO**OS Shinkansen railway automatic control system of the island country was only developed in 95 years, and now there is not even a shadow.

Liang Yuan looked at the people around him with great interest, and they all looked at himself curiously and said with a smile: "Actually, it's very simple, on the basis of this system, you can add a wireless communication chip." ”

"To put it simply, it is to change the stepped speed interval mode currently implemented by the Shinkansen to the target distance curve speed control mode, through the guò communication chip, the rear train calculates its position in real time, the distance from the train in front, and then refers to its own braking curve and braking distance to make a judgment on whether it should brake and slow down. ”

"However, if you want to complete this system, it is impossible to rely on Lao Su's current eight-bit single-chip microcomputer, and Lao Su must at least improve the performance of the HT680 chip by four to six times to meet the needs of the whole system. ”

Note 1: The electrification transformation of the railway does not refer to the replacement of the traction head with the electric locomotive, but refers to a series of railway operation links such as signal, turnout transformation, shunting, operation, marshalling, etc., and the use of automated electrical equipment for large-scale transformation, and the replacement of the electric locomotive is only a small part of it. (To be continued......)

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