Method for lowering train energy consumption and improving route transportation capability
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A transportation capacity and train technology, which is applied in the field of inter-train communication and control of rail transit, can solve problems such as traction, braking or even emergency braking, reducing passenger comfort, and deterioration of the signal-to-noise ratio of communication links. The effect of reducing fluctuations, improving ride comfort, and increasing transportation capacity
Inactive Publication Date: 2014-01-29
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0006] 1. The signal-to-noise ratio of the communication link deteriorates due to external interference, and packet loss will be introduced with a certain probability, and the packet loss rate will increase with the decrease of the signal-to-noise ratio;
[0007] 2. The high-speed movement of the train introduces Doppler frequency shift, and the error of channel estimation increases, resulting in an increase in the packet loss rate;
[0008] 3. When the on-board wireless equipment is switched between access points (Access Point, AP), packet loss will be introduced. As the switching frequency increases, the packet loss rate will increase.
[0009] The existing train operation control mechanism does not consider the impact of communication on the performance of the train operation control system. When the train-ground information packet is lost, it is considered that the preceding train stays at the last reported position, and the following train calculates the emergency braking trigger based on this. This method separates the design of the control system from the Quality of Service (QoS) of the communication system. Packet loss during train-to-ground information transmission will lead to unnecessary traction, braking or even emergency braking of the train. This will eventually lead to an increase in traction energy consumption and reduce the comfort of passengers
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Embodiment 1
[0066] Such as Figure 4 As shown, in a control system composed of n (n≥2) trains, train 1 (T-1) is the first train, train 2 (T-2) is the second train, and train n (T-n) is the last train. l 1 , l 2 ,...,l n are the lengths of T-1, T-2,..., T-n respectively. are respectively the positions of the tails of the kT cycle start times T-1, T-2,..., T-n. are the speeds of trains T-1, T-2,..., T-n at the beginning of the kT period, respectively. Respectively, the distances from the tail position of the kT cycle start time T-2, T-3, T-n train to the rear of the front train,
[0067] In the CBTC system, the train and ZC are strictly time-synchronized, and the sampling period of the train state is very short. Therefore, the three-train control system can be regarded as a discrete linear time-invariant system. Using the method of state space, the multi-train control system is expressed as:
[0068] x k+1 =AX k +BU k , (1)
[0069] u k =-GX k ,
[0070] Among them, X ...
Embodiment 2
[0149] Such as Figure 5 As shown, the control system consists of 3 trains, train 1 (T-1) is the first train, train 2 (T-2) is the middle train, and train 3 (T-3) is the tail train. l 1 , l 2 , l 3 They are the lengths of T-1, T-2, and T-3 respectively. Respectively, the position of the tail of the kT cycle start time T-1, T-2, T-3. They are the speeds of T-1, T-2, T-3 at the beginning of the kT period, respectively. is the distance from the tail of T-2 to the tail of T-1, is the distance from the tail of T-3 to the tail of T-2, d k 3 = s k 3 - s k 2 ·
[0150] In the CBTC system, the train and ZC time are strictly synchronized, and the sampling period T of the train state is very short. The three-train control system can be regarded as a discrete linear non-time-varying system...
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Abstract
The invention discloses a method for lowering train energy consumption and improving route transportation capability, and belongs to the technical field of train communication and control. According to the method for lowering train energy consumption and improving route transportation capability, firstly, a multi-train operation control system affected by transmission packet loss is equivalent to a network control system; an area controller waits for receiving the state information of all the trains, and estimates the state of the train with the state information being not received, the train waits for receiving a mobile authorization command, and a novel mobile authorization command is estimated according to a previous mobile authorization command if the train does not receive the mobile authorization command. The train selects closed-loop gain according to the criterion of the minimum energy consumption or the minimum train interval, and a control command is calculated and executed by utilizing the state of the current train and the states of all the front trains or part of the trains. By means of the method for lowering train energy consumption and improving route transportation capability, unnecessary train traction and braking caused by transmission packet loss of train-ground information can be reduced, the train traction energy consumption is lowered, and riding comfort is improved. Meanwhile, the fluctuation of train intervals caused by the transmission packet loss can be reduced, the route transportation capability is improved, and the riding comfort for passengers is improved.
Description
technical field [0001] The invention belongs to the technical field of inter-train communication and control of rail transit, and in particular relates to a method for reducing train energy consumption and improving line transportation capacity. Specifically, it is a method to reduce the energy consumption of train traction and improve the line passing capacity under the condition of transmission packet loss of train-ground information, and reduce the impact of transmission packet loss on train traction energy consumption and line passing capacity. Background technique [0002] The traditional track-based train control system (Track-based Train Control system, TBTC) uses the track circuit to realize the rough positioning of the train and send control information to the train unidirectionally. Inaccurate positioning and low-speed one-way ground-to-vehicle information transmission reduce the traffic capacity of the line. The minimum departure interval of an urban rail transit...
Claims
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