Loop vehicle detector and vehicle detection method

Abstract

The invention provides a loop vehicle detector which is internally provided with a plurality of external feeder lines, a secondary coil inductance connected with the external feeder lines, a channel scanning circuit connected with the secondary coil inductance and a singlechip connected with the channel scanning circuit, wherein the singlechip controls the channel scanning circuit to open the next input channel and close the previous one; and when the singlechip detects that the connection between one of the input channels and the external feeder lines is interrupted, the singlechip shields the input channels and detects the next input channel, thereby shortening the scanning period, accelerating the scanning frequency, enhancing the system precision and improving the reliability of data acquisition compared with the prior art.

Description

technical field [0001] The invention relates to a loop coil vehicle detector and a vehicle detection method, in particular to a loop coil vehicle detector and a vehicle detection method that can improve the reliability of data collection. Background technique [0002] As the front end of the urban traffic signal, the toroidal coil vehicle detector provides the original information of the traffic flow for the traffic control system, and provides the original information for the optimization of the control scheme; or the toroidal coil vehicle detector can be used as a coil type electronic police capture control unit. The working principle of the toroidal coil vehicle detector is: when the vehicle is in the detection field of the induction coil, the inductance of the toroidal coil changes, and the presence or passage of the vehicle in the detection field is indicated by the corresponding predetermined oscillation frequency change; the vehicle flow is counted when the vehicle pas...

AI Technical Summary

Problems solved by technology

As mentioned above, the data acquisition of the toroidal coil vehicle detector is mainly completed by changing the oscillation frequency of each channel coil, so the high-reliability channel sequential scanning circuit is a technical focus of the toroidal coil detector, and in the current toroidal coil In the scanning circuit of the coil vehicle detector, the crosstalk is relatively large during high-frequency signal transmission, especially when multiple sets of high-frequency signal lines are close together, which greatly affects the reliability of data acquisition

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