1. Overview of Vehicle Detectors

Vehicle detectors primarily target motor vehicles and are used to detect data related to vehicle passage or parking, providing sufficient information for smart parking systems to make optimal decisions.

Magnetic detection is a new vehicle detection technology that primarily uses magnetic resistance sensors (xMR) to sense the magnetic field within its range, thereby distinguishing vehicle situations. Currently, magnetic vehicle detectors predominantly utilize wireless transmission, offering high detection accuracy, stability, and convenient installation and maintenance, making them highly sought after in the market.

2. Working Principle of Vehicle Detectors

Inductive loop vehicle detectors operate based on the principle of electromagnetic induction. They are typically embedded in the roadbed under the same lane, passing a specific working current through the loop, which acts as a sensor. When a vehicle passes through or stops on the loop, the metal in the vehicle alters the magnetic flux within the loop, causing a change in the inductance of the loop circuit. The detector determines the status of passing vehicles by detecting this change in inductance.

3. Components of Vehicle Detector Systems

Inductive vehicle detectors include sensing loops and detectors, where the loop acts as data collection, and the detector performs data judgment and outputs corresponding logical signals. The detector typically consists of a frame, central processing unit, detection card, and terminal connectors.

4. The Role of Vehicle Detectors

In parking systems, understanding the role of inductive loops requires knowing their installation locations. Inductive loops are generally installed in four locations: at the entrance ticket machine (entrance control machine), one at the entrance and exit barriers, and at the exit ticket machine (exit control machine).

5. Selection of Vehicle Detectors

Currently, there are various types of vehicle detectors in parking systems, such as inductive loop vehicle detectors, microwave radar vehicle detectors, video vehicle detectors, and magnetic vehicle detectors. Among them, inductive loop vehicle detectors are the most widely used due to their low cost, strong practicality, and high accuracy, but they have the disadvantage of high construction difficulty, severe damage to the road surface, and maintenance challenges.

6. Installation Process of Vehicle Detectors

The installation process includes unpacking, marking, trenching, installation, wiring, testing, and sealing.

7. Common Faults and Solutions for Vehicle Detectors

1. Fault: Vehicle Cannot Pass Through Barrier

Possible Reasons:

(1) Incorrect installation or damage of the inductive loop;

(2) Insufficient power supply for the vehicle detector or improper sensitivity adjustment (too high or too low);

(3) Disconnection or poor contact between the “COM” terminal of the inductive detector and the “GND” common ground of the barrier controller.

2. Fault: Barrier Does Not Drop After Vehicle Passes

Common causes include manual mode settings, issues with the inductive processor, or interference from other external devices.

3. Key Points for Measuring Vehicle Detectors

Measure according to design drawings in units of “sets”.

4. Project Feature Description Points

Name, specifications, model, etc.