# US 10,308,264 B2 · System for controlling speed of railway vehicles by considering braking characteristic

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- Number: US 10,308,264 B2
- Document ID: US10308264B2
- Status: Granted
- Kind: B2
- Application number: 15/366,314
- Filed: 2016-12-01
- Published: 2017-07-06
- Granted: 2019-06-04
- Earliest claimed: 2015-12-31
- Assignees: Lsis Co., Ltd.
- Applicants: Lsis Co., Ltd.
- Inventors: Jong-Chul Jung; Yong-Gee Cho
- Web page: https://patentgrep.com/patent/US10308264B2

## CPC

- B61L 15/0058: {On-board optimisation of vehicle or vehicle train operation}
- B61L 15/0062: {On-board target speed calculation or supervision}
- B61L 27/04: Automatic systems, e.g. controlled by train; Change-over to manual control
- B61L 2027/204: {using Communication-based Train Control [CBTC]}
- Y02T 10/72: Electric energy management in electromobility
- B61L: GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC (brakes or auxiliary equipment B61H, B61K; point or crossing construction E01B)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present disclosure relates to a speed control system of a railway vehicle in consideration of a braking characteristic, and more particularly, to a speed control system of a railway vehicle in consideration of a braking characteristic, which calculates in real time a time-to-target-speed-crossing (TTTSC) that is a time required for a speed of a train to exceed a speed of an automatic train operation (ATO) profile through a future speed estimation of the train, and controls the speed of the train to be interlocked with the TTTSC.

## Claims

### Claim 1

A speed control system of a train, comprising:
a speed control unit; and
a braking control unit,
wherein the braking control unit includes:
a future speed estimation unit configured to estimate a future speed of the train using track data and train data;
a time-to-target-speed-crossing (TTTSC) calculation unit configured to calculate a TTTSC using the future speed of the train, which is estimated from the future speed; and
a brake output determination unit configured to determine a brake output determination signal through a comparison between the TTTSC and a braking characteristic value of the train and transmit the brake output determination signal to the speed control unit to apply a braking output to the train,
wherein the TTTSC is a remaining time until when a speed of the train is the same as that of an automatic train operation (ATO) profile, and
wherein the braking characteristic value is set to minimize a response delay according to a free running time due to a braking characteristic.

### Claim 2 (depends on 1)

The speed control system of claim 1, wherein the speed control unit includes:
an ATO speed profile generation unit configured to generate an ATO speed profile using an automatic train protection (ATP) speed limit;
a comparator configured to generate an error signal by comparing the ATO speed profile generated from the ATO speed profile generation unit with the current speed of the train; and
a speed controller configured to generate a speed control signal by receiving the error signal generated through the comparator and the brake output determination signal.

### Claim 3 (depends on 1)

The speed control system of claim 1, wherein the future speed estimation unit estimates the future speed of the train using train information including a dynamic model of the train, traction force information, and braking force information, and track information including track slope information and curvature information.

### Claim 4 (depends on 1)

The speed control system of claim 1, wherein the brake output determination unit outputs an activated brake signal when the TTTSC calculated through the TTTSC calculation unit is equal to or less than the braking characteristic value of the train, and outputs an inactivated brake signal when the TTTSC exceeds the braking characteristic value of the train.

### Claim 5 (depends on 1)

The speed control system of claim 1, wherein the free running time is a time in which the train runs from a time when the braking instruction is input to a time when braking is operated.