AUTOMOTOR SPEED MESUREMENT & VEHICLE TYPE DECISION METHOD

摘要

The speed of a vehicle is obtained by calculating the average speed of cars passing between a loop coil(10-1) and a loop coil (10-2) within a certain time. The method for discriminating kinds of vehicles comprises the steps of; generating A pulse and B pulse when passing loop coils(10-1),(10-2); operating logic AND with A pulse and B pulse to decide a small type if A*B pulse doesn't exist; delaying B pulse to generate B' pulse if A*B exists and operating logic AND with A pulse and B' pulse to decide a large type if A*B' exists, otherwise a middle type.