Onboard automobile data logger

By order of an American vendor of automobile communication devices we developed a new ready-to-operate product — a portable automobile recorder for control and diagnostics of technical state ("black box" for an automobile). It is plugged into a standard OBD-II plug, traces a route, fixes tens of technical parameters, records negotiations of passengers in a passenger compartment and transmits all information over a wireless channel to a dispatch-coordination center. The size of the recorder: slightly more than a matchbox.

Key characteristics of the automobile recorder

  • The casing of the device is protected from unauthorized shutdown (the mechanism is blocked in a plug using a special key)
  • The device fixes different technical parameters according to the OBD-II standard:
    • rate of motion
    • engine speed rate
    • fuel content
    • brake operation
    • coolant temperature
    • air conditioning system state, etc.
  • If the automobile is in a Wi-Fi access area (IEEE-802-11b/g), data of the recorder can be transmitted remotely. The capability to store information on a USB drive is also implemented.
  • Software provides the following functions:
    • fault-tolerant firmware upgrade without data loss
    • codification of an initialization file of the recorder
  • The device can be used for finding causes and RTI causers, information collection for a hire fleet and parental control
     

Onboard recorder specifications

Hardware
Processor Atmel AT91SAM9RL64, ARM 9
RAM 32 MB SDRAM, 1024 MB NAND flash
Interfaces
GPS Worldwide navigation network
USB USB 2.0 Device
WiFi IEE802-11b/g
UART Used for debugging
SPI Used for connection with a microchip of CAN-interface
CAN Interface for automobile diagnostics
Software
Operating system Linux
OBD-protocol support ISO9141, ISO14230, PWM, VPW
General characteristics
Size 66,5 mm х 56 mmх 33,8 mm

 

Project results

In the process of developing the onboard automobile recorder Promwad experts accomplished the following tasks:

— Software development and testing
— Case design and construction development

— Production and debugging of prototypes