What is the difference between a mobile block and a traditional automatic block

Mobile blocking refers to a communication-based blocking method in which the subsequent train automatically sets the running speed according to the distance between the train and the preceding train and the approach conditions.

The interval between trains of this block system is not fixed, as long as the braking distance of the subsequent train is guaranteed and the appropriate protection distance is ensured, so that the traffic density is greatly improved, especially suitable for the high-density urban rail transit system.

The principle of the automatic block system is to transmit the track information to the on-board system of the EMU through the rail, and announce the idle state of the two block partitions in front of the train through the red, yellow and green display modes of the signal.

A red light indicates that the zone is being occupied, and the train is required to stop and not to cross it for the time being (it can run at a low speed after 2 minutes); The yellow light indicates that there is a block in front of you that is idle, and the train is required to pay attention to the operation; A green light indicates that at least two zones are free ahead, indicating that the train can run at the specified maximum speed.

Mobile occlusion is a new type of occlusion technology developed based on the principle of interval occlusion. It dynamically calculates the safety distance between adjacent trains based on the actual operating speed, braking curve and the position of the train on the approach. Based on the current operating speed, the subsequent train can safely approach the last confirmed position at the rear of the previous train until the distance between the two is not less than the safe braking distance.

It can be seen that compared with the fixed block, the most significant feature is that the fixed block section separated by the signal is canceled, and the minimum running interval distance between trains is determined by the actual running position and running state on the first road of the train, so the block section is constantly moving forward and adjusting with the movement of the train. In the mobile block technology, the block section is only a logical interval to ensure the safe operation of the train, and there is no physical correspondence with the actual line. Therefore, mobile occlusion is quite different from fixed occlusion in design and implementation.

Mobile blocking generally uses wireless communication.

and wireless positioning technology.

Semi-automatic blocking is a driving mode that requires manual blocking procedures, and the outbound signal automatically closes after the train leaves the station, which automatically constitutes an occlusion.

Automatic blocking is to divide the section into several blocking partitions through the signal, and automatically change the displayed driving mode according to the running position of the train, without manual intervention.

The difference between the two is that semi-automatic occlusion requires human intervention, while automatic occlusion does not require human intervention.

The biggest difference is that one of the tracking points that make up the speed limit condition is the end of the train and the other is the end of the occupied section.

There are also artificial blocks, including telegraph blockage and ** block, electrical road sign and electrical street sign block, etc.

There are also quasi-mobile blocks, mobile blocks, wireless mobile blocks, etc. in the subway. automatic blocking, semi-automatic blocking, and inter-station blocking; Automatic blocking is often used in double-line sections, semi-automatic blocking is often used in single-line sections, and inter-station blocking refers to the blocking mode used between two stations without passing through the signal, which is less used.

1.automatic occlusion;

2.Automatic standing tomb is resistant to hail occlusion;

3.Semi-automatic occlusion.

Single-track railway mu bridges generally mainly adopt computer centralized interlocking semi-automatic blocking, and there are also non-centralized interlocking semi-automatic blocking (in the gradual transformation).

Double-track railways (double-track) are now basically computer-centralized, interlocked, and automatically blocked.

Advantages of the semi-automatic occlusion method:

The biggest advantage is to ensure that there is only one train running at the same time in the section between the two stations, and it is impossible to have accidents such as line invasion and rear-end collision.

1. The semi-automatic block is displayed as the departure voucher by the allowed signal display of the outbound signal, and the outbound signal of the departure station must be agreed by the two stations before it can be opened after going through the blocking procedures, and the outbound signal of the train entering the section is automatically closed; And before the train arrives at the pick-up station, all the signals that depart to this section are not allowed to open, and this guarantees that only one train runs in the section between two stations at the same time.

2. The outbound signal can not be opened arbitrarily, it is controlled by the blocking machine, and only when the section is idle, the two sides can open after going through the blocking procedures (the double-line semi-automatic blocking is the arrival recovery signal of the previous train). When the train departs from the station, the outbound signal is turned off by the sail movement, and the blocking machines of both sides are in the state of "interval blocking" until the train arrives at the receiving station for arrival restoration. There will be no accidents such as line invasion and rear-end collision.

Summary. 1, semi-automatic blocking: this kind of blockage needs to go through the blocking procedures manually, and the train departs by the display of the outbound signal, but after the train departs, the outbound signal can be automatically closed, so it is called semi-automatic blocking.

2, automatic blocking: through the situation of train operation and occlusion partition, can automatically change the display by the signaling machine, and the train runs by the display of the signal, and this occlusion method is completely carried out automatically, so it is called automatic blocking.

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1, semi-automatic blocking: this kind of blockage needs to go through the blocking procedures manually, and the train departs by the display of the outbound signal, but after the departure of the train oak pei car, the beam of the outbound signal can be automatically closed, so it is called the automatic block of the semi-middle completion. 2. Automatic occlusion:

By the situation of train operation and block partition, can automatically change display by signal machine, train runs by the display of signal machine, this block method is completely automatic, so it is called automatic blocking.

1. Semi-automatic blocking is an occlusion method in which the outbound signal automatically closes after the train departs according to the signal display. Its characteristics are: only one train is allowed between stations or between stations; Manual occlusion procedures; Manually confirm the complete arrival of the train and manually restore the blockage.

2. Automatic inter-station occlusion is an occlusion method that automatically handles the occlusion procedures under the condition of interval occupancy inspection, and the outbound signal automatically closes after the train departs according to the signal display. It is characterized by: there is an interval occupancy inspection equipment; Only one train is allowed between stations or between the debates; Automatically handle the occlusion procedures when the departure approach; Automatically confirm the arrival of the train and automatically restore the blockage with Kiritaka.

3. Automatic occlusion Automatic occlusion is the occlusion method that automatically changes the occlusion method displayed by the signal machine and the driver driving by the signal according to the train running wheel chain and the state of the closed plug partition. Its characteristics are: the station is divided into a number of block partitions, there are partitions to occupy the inspection equipment, and generally have a passing signal; Train tracking can be realized between stations; When handling the departure approach, the blocking procedures are automatically handled, and the display through the signal is automatically changed.

The difference between fixed block and mobile block is that the system of fixed block makes the slip of the rolling tong dan unable to accurately know the position of the train now, so the starting point of the train and the end point of the train are always at the boundary of a partition, in order to fully ensure safety, a protective section will be added between the two trains, which makes the safety interval between the trains very large, affects the use efficiency of the line, and the mobile block strictly controls the safety distance of the train. Through the equipment inside the car and the equipment next to the track, the maximum braking distance of the train can be roughly calculated to ensure the safety distance between the front and rear of the train, and the technology has been greatly improved compared with the fixed block.