The use of commercial road vehicles has grown with the recent rapid economic growth in the world, but reckless speeding of these heavy vehicles often results in fatal accidents. The Vehicle Speed Warning System is designed and developed to monitor the vehicle speed and raise an alarm if the vehicle has exceeded the preset speed limit. It consists of in-vehicle subsystem, which is fitted into the vehicle, and peripheral interface subsystem connected to the host computer. The system is designed using MC68HC11E9 micro controller. It allows proper calibration of the in-vehicle subsystem and offline data downloading.
The microcontroller based Vehicle Speed Warning System has been designed and its application software has been developed. The principal objective in designing this warning system is to present and demonstrate the basic concepts of in-vehicle speed detection and wireless data setting and retrieving system, which will serve as a base for future development of vehicle speed monitoring and tracking system.
Table of Contents
1 INTRODUCTION
1.1 Overview
1.2 Background
1.3 Objectives
1.4 Thesis Organization
2 LITERATURE REVIEW
2.1 Introduction
2.2 Vehicle Speed Measurement
2.2.1 Evolution of Speed Sensors
2.2.2 Speedometer
2.3 Components Implementation
2.3.1 Axiom CME11E9-EVBU Development Board
2.3.2 Serial Port (DB9S Style Connector)
2.3.3 Liquid Crystal Display (LCD) Port
2.3.4 MC68HC11E9 Microcontroller
2.3.5 FM Transmitter and Receiver Modules
2.3.6 Analog Switch (4066)
2.3.7 Hall Effect Gear Tooth Sensor
2.4 Out-vehicle Speed Tracking System
2.4.1 AutoPatrol PR-100: Speed Camera System
2.4.2 SPECS System: Cameras and Detection Systems
2.4.3 Speedmaster DS2
2.4.4 Speedster Radar Gun
2.4.5 SpeedLaser: Speed Measurement System
2.4.6 COMBI: Speed and Traffic Data Processing System
2.5 In-vehicle Speed Monitoring System
2.5.1 Speed Trak II: Vehicle Speed Monitoring System
2.5.2 Track Star Fleet Management System
2.5.3 Transportation Technology Solutions
2.5.4 DriveRight 600 Vehicle & Driver Safety Monitor
2.5.5 Fleet Manager 100
2.5.6 Wireless In-vehicle Fleet Monitoring System
2.5.7 V-Count II: Vehicle Speed Monitoring System
2.5.8 The SafeForce Driving System
2.6 Conclusion
3 METHODOLOGY
3.1 General Project Workflow
3.2 Hardware Implementation
3.2.1 Peripheral Interface Subsystem
3.2.2 In-vehicle Subsystem
3.2.3 Speed Calculation
3.3 Software Development
3.3.1 Functional Description
3.3.2 Communication Protocol
3.3.3 Peripheral Interface Subsystem
3.3.4 In-vehicle Subsystem
4 RESULTS AND DISCUSSION
4.1 In-vehicle Subsystem
4.2 Peripheral Interface Subsystem
4.2.1 Personal Identification Number
4.2.2 Commands Menu
4.2.3 Plate Number Selecting
4.2.4 Time and Date Setting
4.2.5 Speed Setting
4.2.6 Output Retrieving
4.2.7 Voltage Level Retrieving
4.2.8 Security Status Retrieving
4.2.9 Output and Security Status Resetting
4.2.10 Password Modification
4.2.11 Plate Number Setting
4.2.12 Time-out Feature
4.3 Comparisons of Vehicle Speed Monitoring and Tracking Systems
4.3.1 Comparison with SPECS System
4.3.2 Comparison with Speedster Radar Gun
4.3.3 Comparison with Speed Trak II
5 CONCLUSION AND RECOMMENDATION
5.1 Conclusion
5.2 Recommendation
Project Objectives and Focus
The primary objective of this project is the design and development of a Commercial Vehicle Speed Warning System capable of monitoring vehicle speed and identifying violations of preset speed limits to enhance road safety for commercial vehicles. The system acts as a passive monitoring unit, providing audible warnings to drivers and recording speeding data for later retrieval by law enforcement.
- Design and development of an in-vehicle speed monitoring and warning subsystem.
- Implementation of a peripheral interface subsystem for remote calibration and data retrieval.
- Integration of a radio frequency (RF) wireless communication link between subsystems.
- Development of an anti-tampering mechanism to prevent unauthorized interference with system operation.
Excerpt from the Book
1.1 Overview
Speeding has been implicated as a major contributing factor in all fatal motor-vehicle crashes. A small increase in traveling speed before braking begins can result in large increases in impact speed and the risk of fatal injury. Even small differences in impact speed will make a large difference to the probability of serious injury. Figure 1.1 shows the risk of a crash at difference speeds relative to travelling at 60 km/h.
From the figure, driving at 65 km/h is twice as likely to have a crash as a driver traveling at 60 km/h, and driving at 70 km/h the driver is more than 4 times as likely to crash. When a driver is speeding, there is less time for both that driver and any other road user to recognize danger, decide on an evasive action (brake) and complete the evasive action.
Chapter Summary
1 INTRODUCTION: Presents the motivation and objectives for developing a speed warning system for commercial vehicles to improve road safety.
2 LITERATURE REVIEW: Analyzes various existing speed monitoring technologies, ranging from traditional radar systems to advanced fleet management tools.
3 METHODOLOGY: Details the hardware design and software development process, including the communication protocol and functional subsystems.
4 RESULTS AND DISCUSSION: Explains the physical implementation of the subsystems and provides evidence of the system's operational performance.
5 CONCLUSION AND RECOMMENDATION: Summarizes the project achievements and suggests future enhancements like system integration into a single-chip architecture.
Keywords
Speed Warning System, Commercial Vehicle, Microcontroller, MC68HC11E9, Road Safety, Speed Sensor, Wireless Communication, Radio Frequency, Fleet Management, Anti-Tampering, Data Logging, Violation Records, Speed Limit, Traffic Enforcement, Embedded System
Frequently Asked Questions
What is the core purpose of this research?
The research focuses on designing a Commercial Vehicle Speed Warning System to monitor the speed of trucks, trailers, and buses, helping to prevent fatal accidents caused by reckless speeding.
What are the primary subsystems involved?
The system is comprised of two main components: the In-vehicle Subsystem, which monitors the speed and logs violations, and the Peripheral Interface Subsystem, used by authorized personnel to set parameters and download stored data.
How is the speeding data recorded?
When the system detects that a driver has exceeded the preset limit for more than 10 seconds, it logs the time, date, and duration of the speeding incident in a non-volatile memory module.
What technology is used for wireless communication?
The system uses radio frequency (RF) transmitter and receiver modules at 433.92 MHz to ensure reliable communication without requiring a direct line-of-sight.
How is the speed detected?
A Hall Effect Gear Tooth Sensor is used, which generates a digital signal proportional to the rotational speed of the vehicle's transmission drive pinion.
What is the significance of the anti-tampering feature?
The anti-tampering feature registers a violation if the power supply to the unit is interrupted, ensuring that drivers cannot disable the system to hide their speeding behavior.
Why was the MC68HC11E9 microcontroller chosen?
It was selected for its versatile linear memory map, robust instruction set for 16-bit math operations, and built-in peripherals suitable for automotive applications.
How does the system handle security and unauthorized access?
The system is password-protected, requiring a five-digit code for any calibration or data modification tasks, such as changing the speed limit or erasing violation records.
What is the "Time-out" feature?
This feature manages communication errors by automatically resetting the peripheral interface if no response is received from the in-vehicle unit within a 7-second window.
- Quote paper
- Ngo Chon Chet (Author), 2005, Development of a Vehicle Speed Warning System, Munich, GRIN Verlag, https://www.grin.com/document/284134
