Initially developed for aviation diagnostics, this sub-system found applications in the ground vehicle platforms arena.
The WestWind Stryker BMS hardware consists of one Control Unit (CU), six battery mounted Sensor Units (SU) and the associated wiring harnesses. The CU interfaces to the GDLS Diagnostics Control Unit (DCU) via a J1939 CANbus.
The CU receives the temperature, current and voltage data from the SUs which is used in conjunction with the battery type information to calculate the Battery State of Health (SoH), State of Charge (SoC), and time remaining information approximately every 10 to 15 seconds. The data is stored in the CU awaiting output to the DCU upon command. The memory size is such that multiple data packets can be saved, downloaded and used for trending analysis if desired.
The design includes an optional RS-232 diagnostic communication port that will be used during development for hardware and software de-bug purposes. This feature can be removed, or used in addition to, or in lieu of, the DCU CANbus for initial installation tasks such as entering the battery type and configuration, initial calibration and offset adjustments, downloading of saved data or for maintenance tasks.
The CU also provides Start-up Built-In-Test (SBIT) functions which are performed at the application of Master Power. Background BIT (BBIT) is performed in the background during ACTIVE mode and the system status/health is saved and reported to the DCU upon command.