Vehicle of passing state discrimination method and passing state discrimination apparatus for a vehicle using this method, receipt number automatic counting device of vehicle

摘要

PURPOSE: To provide a vehicle pass state discriminating method, which can discriminate the passing direction of a vehicle to accurately discriminate the pass state of the vehicle passing a monitor area and accurately counts the number of vehicles, and a vehicle pass state discriminating device and an entering vehicle number counting circuit which use this method. ;CONSTITUTION: A pair of ultrasonic transmitter-receivers S1 and 52 which output ultrasonic pulses and detect the reflected waves are arranged in the going direction of a vehicle passage 3 with about the vehicle length between them. When a vehicle 2 passes, ultrasonic pulses are simultaneously transmitted from the pair of ultrasonic transmitter-receivers S1 and 82. and it is discriminated whether reflected waves reflected from the vehicle 2 exist or not at this time, and classifications X00 to X11 of the detection pattern of the pair of ultrasonic transmitter-receivers S1 and S2 are stored at each time of the change, and the pass state of the vehicle is discriminated based on the history of the change of classifications X00 to X11 of the detection pattern stored in this manner.;COPYRIGHT: (C)1995,JPO