Method and apparatus for calculating the green light time in traffic-dependently controllable street traffic signal systems
First Claim
1. An apparatus for determining and prematurely terminating the green light duration in a programmed traffic-dependently controllable street traffic system utilizing measured time intervals, between successive vehicles comprising means, including a vehicle detector, for deriving signals representing actual time values of intervals between successive vehicles of a traffic flow during the duration of a green light signal, first comparing means to which said actual time values are supplied for comparing said actual time values with a first theoretical time limit value, a first OR gate having a first input to which said first comparing means is connected whereby, upon an actual time value reaching said first theoretical value, a disconnect order for termination of the green light duration appears at the output of said first OR gate, second comparing means to which successive actual time values are supplied for comparing the actual time values of a predetermined number of successive intervals with a second theoretical time value, said second comparing means having a plurality of outputs equal to said predetermined number at which a signal appears when a respective one of said intervals exceeds said second theoretical time value, and an AND gate means connecting said outputs of second comparing means to said first OR gate, whereby upon any two actual time values each exceeding said second theoretical time value said AND gate means is enabled and a disconnect order for the termination of the green light duration likewise appears at the output of said first OR gate.
0 Assignments
0 Petitions
Accused Products
Abstract
A traffic-dependently controllable signaling system utilizing the lengths of the time intervals between two successive vehicles for terminating the green light duration for the involved flow of traffic, in which each time interval is compared with a first, larger theoretical time limit value. If the first theoretical time limit value is reached, the green light signal for such traffic flow is terminated. In addition, all time gaps are compared with a second smaller theoretical time limit value and if this second theoretical time limit value is exceeded by two successive time intervals or at least two of a group of time intervals, the green light signal for the particular flow of traffic is likewise terminated.
23 Citations
8 Claims
- 1. An apparatus for determining and prematurely terminating the green light duration in a programmed traffic-dependently controllable street traffic system utilizing measured time intervals, between successive vehicles comprising means, including a vehicle detector, for deriving signals representing actual time values of intervals between successive vehicles of a traffic flow during the duration of a green light signal, first comparing means to which said actual time values are supplied for comparing said actual time values with a first theoretical time limit value, a first OR gate having a first input to which said first comparing means is connected whereby, upon an actual time value reaching said first theoretical value, a disconnect order for termination of the green light duration appears at the output of said first OR gate, second comparing means to which successive actual time values are supplied for comparing the actual time values of a predetermined number of successive intervals with a second theoretical time value, said second comparing means having a plurality of outputs equal to said predetermined number at which a signal appears when a respective one of said intervals exceeds said second theoretical time value, and an AND gate means connecting said outputs of second comparing means to said first OR gate, whereby upon any two actual time values each exceeding said second theoretical time value said AND gate means is enabled and a disconnect order for the termination of the green light duration likewise appears at the output of said first OR gate.
Specification