Traffic signal control system, traffic signal control apparatus, and traffic signal control method
First Claim
Patent Images
1. A traffic signal control system comprising:
- storing means for storing a first pattern switching table in which a traffic signal control parameter P1(i) is set in association with each first time zone B1(i) of a first time schedule in which all time zones of a whole day is divided into a plurality of first time zones, where i denotes an integer of 1 to m and m denotes the number of time zones specified in the first pattern switching table;
selecting means for selecting a traffic signal control parameter corresponding current time from the stored first pattern switching table;
controlling means for controlling a traffic signal light unit using the selected traffic signal control parameter; and
travel time acquiring means for acquiring travel time information about a vehicle within one or a plurality of road sections in a vicinity of the traffic signal light unit,wherein the storing means further stores a second pattern switching table in which a condition regarding a travel time in a second time zone T2 including only some of all the time zones of the whole day, and a traffic signal control parameter P2 selected when matching the condition are set in association with each other,wherein the traffic signal control system further comprises determining means for determining whether or not an index obtained on the basis of travel time information acquired by the travel time acquiring means matches the condition, andwherein the selecting means is configured to select the traffic signal control parameter P2 set in the second pattern switching table in place of the traffic signal control parameter P1(i) if the determining means determines that the index matches the condition.
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Abstract
Provided is a traffic signal control system that can operate in a flexible and sophisticated manner by, after selecting a pattern of a traffic signal control parameter corresponding to the current time using a first pattern switching table that is used in a time-controlled pattern selection scheme, selecting again a pattern using an additional second pattern switching table, where a call condition for selecting a set pattern is set in the second pattern switching table, and by selecting the pattern set in the second pattern switching table in place of the pattern selected in the first pattern switching table if a calculated travel time matches the call condition.
4 Citations
7 Claims
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1. A traffic signal control system comprising:
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storing means for storing a first pattern switching table in which a traffic signal control parameter P1(i) is set in association with each first time zone B1(i) of a first time schedule in which all time zones of a whole day is divided into a plurality of first time zones, where i denotes an integer of 1 to m and m denotes the number of time zones specified in the first pattern switching table; selecting means for selecting a traffic signal control parameter corresponding current time from the stored first pattern switching table; controlling means for controlling a traffic signal light unit using the selected traffic signal control parameter; and travel time acquiring means for acquiring travel time information about a vehicle within one or a plurality of road sections in a vicinity of the traffic signal light unit, wherein the storing means further stores a second pattern switching table in which a condition regarding a travel time in a second time zone T2 including only some of all the time zones of the whole day, and a traffic signal control parameter P2 selected when matching the condition are set in association with each other, wherein the traffic signal control system further comprises determining means for determining whether or not an index obtained on the basis of travel time information acquired by the travel time acquiring means matches the condition, and wherein the selecting means is configured to select the traffic signal control parameter P2 set in the second pattern switching table in place of the traffic signal control parameter P1(i) if the determining means determines that the index matches the condition. - View Dependent Claims (2, 3, 4, 5)
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6. A traffic signal control apparatus comprising:
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storing means for storing a first pattern switching table in which a traffic signal control parameter P1(i) is set in association with each first time zone B1(i) of a first time schedule in which all time zones of a whole day is divided into a plurality of first time zones, where i denotes an integer of 1 to m and m denotes the number of time zones specified in the first pattern switching table; selecting means for selecting a traffic signal control parameter corresponding to current time from the stored first pattern switching table; controlling means for controlling a traffic signal light unit using the selected traffic signal control parameter; and travel time acquiring means for acquiring travel time information about a vehicle within one or a plurality of road sections in a vicinity of the traffic signal light unit, wherein the storing means further stores a second pattern switching table in which a condition regarding a travel time in a second time zone T2 including only some of all the time zones of the whole day, and a traffic signal control parameter P2 selected when matching the condition are set in association with each other, wherein the traffic signal control apparatus further comprises determining means for determining whether or not an index obtained on the basis of travel time information acquired by the travel time acquiring means matches the condition, and wherein the selecting means is configured to select the traffic signal control parameter P2 set in the second pattern switching table in place of the traffic signal control parameter P1(i) if the determining means determines that the index matches the condition.
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7. A traffic signal control method comprising:
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a storing step of storing a first pattern switching table in which a traffic signal control parameter P1(i) is set in association with each first time zone B1(i) of a first time schedule in which all time zones of a whole day is divided into a plurality of first time zones, where i denotes an integer of 1 to m and m denotes the number of time zones specified in the first pattern switching table; a selecting step of selecting a traffic signal control parameter corresponding to a current time from the stored first pattern switching table; a controlling step of controlling a traffic signal light unit using the selected traffic signal control parameter; and a travel time acquiring step of acquiring travel time information about a vehicle within one or a plurality of road sections in a vicinity of the traffic signal light unit, wherein the traffic signal control method further comprises a second storing step of storing a second pattern switching table in which a condition regarding a travel time in a second time zone T2 including only some of all the time zones of the whole day, and a traffic signal control parameter P2 selected when matching the condition are set in association with each other, and a determining step of determining whether or not an index obtained on the basis of travel time information acquired in the travel time acquiring step matches the condition, and wherein the selecting step is configured such that the traffic signal control parameter P2 set in the second pattern switching table is selected in place of the traffic signal control parameter P1(i) if it is determined in the determining step that the index matches the condition.
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Specification