Automotive Electronics Solution for Traffic System



System Introduction

Automotive electronics is a fast-growing industry in pace with the increase of car ownership, and the demand for it is ever-increasing. Therefore, it is the right time to develop self-navigation products that can eventually evolve into an all-inclusive electronic information system that integrates and displays communication, navigation, entertainment and meter panel information such as speed, temperature, fuel and operating status.


Automotive electronic products must feature environmental resistance to harsh humidity, temperature and vibration and high mechanical strength. On the other hand, when automobiles are becoming increasingly electronic, the number of automotive electronics products in use has risen dramatically, which in turn requires themselves to be small and light.


Structure of Automotive Electronics

An automotive electronics system mainly includes the main control unit, the display unit, Global Positioning System (GPS), 3G/GSM wireless communication, burglar alarm, visual reversing radar, in-car entertainment system, car status display and so on.


Block Diagram




MEC-4004 is the core of the system control part, responsible for data acquisition, processing and display on TFT LCD screen. As the core processing part of the system, the requirements on stability, reliability and continuity are very high.


The GPS module is used to receive the signals from GPS satellite and locate the vehicle terminal. It is composed of transducer, signal channel, microprocessor and storage unit. Location coordinates are sent to the main controller by GPS module through serial ports. The main controller also sends setting commands to the GPS module to control its status and operating mode. The GPS module needs to be equipped with special GPS antenna to receive GPS satellite signals. Generally, the signals from at least three satellites are required for precise positioning. Positioning will be more accurate when the antenna is placed on the roof of the automobile.


The 3G/GSM module can easily use GSM network for communication and is connected to and communicate with the main controller at a specified baud rate through serial ports. The main controller can also control the GSM module to send short messages using AT 3G/GSM commands, transmit data and make voice calls by using GPRS. Data communication between GSM module and SIM card is conducted through SIMCLK and SIMDATA. In order to control the time interval between sending and receiving messages, it is better to use the SIM cards provided by the same telecom operator. A GPRS supporting SIM card is needed and GPRS service needs to be enabled when using GPRS function. The 3G/GSM module also supports two microphones, two speakers, and one buzzer. One of the microphones and one of the speakers can be connected to the earphone on the handle to make the automotive telephone usable.


The car reversing radar, namely visual car reversing aid system, is a video camera installed on the luggage boot cover or bumper, and the video it shoots is transmitted to and displayed on the electronic screen in front of the driver’s seat so that the driver can see the rear view clearly through the electronic display. It solves the problems of reversing, night vision and so on. A variety of systems and equipment based on the principle of radar (laser or ultrasonic) ranging are widely used on the automobile. They can be used to precisely measure the distance between the wave source and an obstacle, and the distance is displayed numerically on the meter which is within the visual range of the driver, or an alarm sounds when approaching an obstacle. Sometimes both methods are used.


The detection of automobile status includes the testing items of speed, distance, rotation speed, oil pressure, air pressure, meters of water temperature, fuel and charge and so on. Structurally, it comprises three parts: hardware platform, system software and application software.


System Requirements

1) High stability and adaptive to the change of temperature.
2) Good resistance to magnetism and vibration so that dead halt is avoided.
3) Small size since terminal equipment should be installed in the automobile where it is virtually unnoticed.
4) Easy to operate: The driver can easily respond through buttons on the screen or touch screen.
5) High processing speed: High data processing speed is required for data uploading and downloading.
6) High expansibility: Terminal equipment can be expanded without being completely replaced in the future.


Motherboard Selection

The motherboard EC4-1811LD2NA-U7500 with Intel® Core™ 2 Duo U7500 CPU, featuring onboard low-power CPU, memory and CF card. Motherboard integration improves the resistance to vibration and magnetism, and achieves stability, small size and high performance. The provision of PC/104 slot meets the requirement of the in-vehicle system.



CPU: Intel® Core™ 2 Duo U7500 1.06GHz;
Memory: DDRII SO-DIMM RAM, up to 2GB;
Display: Supports VGA + DVI dual-display;
Ethernet: 2 x 10/100/1000Mbps network interface;
IO Interface: AC´97 Audio interface; 1 x PS/2, 2 x RS232, 2 x RS422/485, 6 x USB;
Storage: Two SATA interfaces, 1 x CF;
Power Supply: DC6V~32V power.


System Evaluation

This automotive electronic system can satisfy car userscurrent demands for automotive electronics. Furthermore, it is expected to have a good extensibility and expandability in the future.


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