Parking Guidance System

MODELS

A displaying system that provides the latest parking information and directs the drivers to free parking space along the shortest possible route.

Vehicle Detection Technology

Ultrasonic Object Detector Technology

Inductive Loop Detector Technology

Inductive Loop Detector

• A coil of wire is buried under the parking lot and connected to a roadside control box

Ultrasonic Detector

Ultrasonic Detector

• Install in the ceiling on each parking lot
• - Ultrasonic frequencies (25.8kHz or 24.7kHz)
• - To detect the presence of car in the corresponding parking lot
• - LED is integrated in detector to indicated two possible states Free (Available) or Occupied
• - Low construction/installation cost compared with inductor loop detector

Ultrasonic vs. Inductive Loop

Criteria for comparison include:

• Data accuracy, Environmental effect, Reliability, System expendability, Cost and Ease of installation and maintenance.

  	Ultrasonic	Inductive loop
  Data accuracy	Good (98% or above)	Good (98% or above)
  Environmental Effect	Low	Low
  Reliability	Good	Good
  System expendability	Good	Medium
  Ease of installation/maintenance	Easy	Difficult
  Construction cost	Medium	High

Vehicle Detection Technology

• Ultrasonic Detector is selected in our parking guidance system.

Reference:

• Naoyuki Ushio and Toshiyuki Shimizu, “Loop vs ultrasonic in Chicago: Ultrasonic vehicle detector field test isolating diffused reflection and enduring harsh environment”, 1997

System Architecture of Parking Guidance System

System Architecture of Parking Guidance System

System Architecture of Parking Guidance System

Digital Display and Signage