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Anti Collision Devices (ACD)

Submitted By: Tarun KhanejaRoll no : 2110045Contact no : 09034406598

Accident (Collision)

Anti Collision Device (ACD)

The ACD Network is a Train Collision prevention system invented by Rajaram Bojji .

Overview They take inputs from GPS satellite system for position

update and  for exchanging information .

ACDs fitted both in Locomotive and Guard's Van of a train.

ACD’S act as a watchdog in the dark as they constantly remain in lookout for other train bound ACDs .

They communicate through their radios and identify each other. If they happen to find themselves on the same track and coming closer to each other, they automatically restrain and stop each other.

Loco ACD of a train also applies brakes to reduce the train speed either to 15 km/h. 

 or to bring the train to a stop if train bound ACDs of other train are radiating 'train parted' message. 

Unit for Locomotive( L 435 x W 203 x H 342

mm )

Working of ACD

‘ACD Network’ consists of mobile ACDs (on Locomotives and Guard’s Brake Vans) and trackside ACDs (at Stations, Level Crossings, Locosheds, Sensors based and Repeaters, en-route).  

Mobile ACDs take inputs from GPS satellite system for position updates and network with track-side ACDs located within a radius of Three Kms (using UHF radio modems); to activate brake(s) with the help of on-board Loco ACD(s) through their Automatic Braking Units (ABUs), whenever a collision-like situation is ‘perceived’.

‘ACD Network’ is likely to prevent ‘head-on’ and ‘rear-end’ collisions in mid-sections, collisions at ‘high speed’ in ‘station area’, ‘side collisions’ with derailed vehicles obstructing adjacent line, collisions due to ‘train parting / jumbling’ and collisions with ‘road vehicles’ at level crossing through ‘Train Approach’ warning and detection of ‘Gate Open’. Loco ACDs also give ‘Station Approach’ warning to drivers. Moreover, using Manual ‘SOS’ buttons on their ACDs, Drivers, Guards and Station Masters can also ‘stop’ trains when any unusual is detected.

Benefits of the ACD system

1. Very economical and cost effective.

2. Easily adaptable and expandable.

3. Does not degrade the existing safety level.

4. Employs state-of-art hardware and software technology.

5. No way had side equipment required, hence no requirement of Power.

6. No cabling on the track required (which is more expensive and cumbersome).

7. Less susceptible to Vandalism.

8. It does not require any inputs to be fed by the crew at the start of journey, thus human error is eliminated.

9. Maintenance Support System (MSS) daily Reports of incidences of Warning to the Driver due to Gate OPEN or Obstruction.

10. Date wise Report of incidences of Warning to the Driver due to Gate OPEN or Obstruction.

11. Daily Maintenance Report “ Failure of Loco Unit and Gate Unit.

12. Date wise Maintenance Report “ Failure of Loco Unit and Gate Unit.

Test on ACD by Rajaram Bojji

Applications

ACDs can be implemented in railways to prevent collisions and to decrease the timing between two consecutive trains running one after another.

It can be used in heavy vehicles like cranes, earthmovers etc to prevent accidents and for their safe working in public places.

ACDs can be used as a tracking device.