Standardization Of Logic For A Constant Warning
Time Control At Automatic Level Crossings
Author(s)
M. Teramoto, N. Miyaguchi, K. Kumasaka, R. Ishima
& Y. Fukuta
Abstract
In Japan, there are a lot of high-density railway lines and along the line the long
warning time at level crossings has become a social problem. Particularly, about
600 level crossings have a warning time of more than 40 minutes per hour in
rush hour. As a result, the traffic of cars and pedestrians is disturbed for a long
time. Eliminating level crossings by making overhead crossings has been
attempted, but a lot of time and costs are necessary. Therefore, it is an urgent
problem to shorten the warning time for such level crossings.
Although a constant warning time control for level crossings has been widely
adopted at JR East as a countermeasure against the length of time that the level
crossing barrier is closed, it requires a lot of hard work on its design and
construction as well as testing because its control logic differs in level crossings.
In order to cope with this situation, we employed a new train counting sequence,
employing two types of counting logic to replace the track circuits. To realize
this logic, we only need two starting points and one stopping point. When a train
enters one of the two starting points, the train is counted according to the
corresponding type. When the train leaves the stopping point, it is subtracted.
Thus, we have achieved a train recognition sequence without track circuits. We
can apply this simple sequence to all types of automatic level crossings. We are
going to incorporate this logic in PLC (programmable logic controller) as a new
microelectronic level crossing controller. It is expected to become a product after
passing the field test. By using our development, it is expected to reduce the time
for design, construction and testing. Furthermore, it is also expected to reduce
the number of relays, which leads to a reduction in cost. By the above-mentioned
Keywords
level crossings, Constant Warning Time Control, level crossing controller, extraordinary long time closed level crossing, ATS-P
Related Book
Other papers in this volume
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