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October 2004
The EV Control Unit is a central sensor computer for all those miscellaneous features.
Critical Features
The critical features are safety features which must have a high level of reliability. This includes:
- Low battery charge stop (settable based upon SOC)
- Accessory low battery charge stop
- Emergency power cut-off
- A gentle chime when the vehicle is put into reverse
- Overtemp protection for LiIon battery pack
- Warning if power steering brushes are worn
- Use existing fuel gauge to indicate state of charge
- Convert Inverter RPM signal to signal for tach
- Display errors if a high reliability fashion
- Warning if heater fault
Comfort/Informational Features
The comfort/informational features are features which do not require a high level of reliaility, and thus can be based on easy-to-program operating systems.
- Interface to the critical features system for displaying of error codes, etc.
- Interface to the inverter for real time information (via RS-232 and DOS)
- Display nice information on a touch screen
- Interface to GPS for recording of routes, and calculating power usages
Input connections
- Heater fault
- PS brushes
- Pack Voltage
- Pack Amperage
- FNR reverse
- Battery temp sensors
- GPS interface
- Failure power inverter
- Failure DC-DC system (controller)
- Power reduced indication(controller)
- Motor speed (controller)
Output Connections
- Tachometer
- Display: voltage, amperage, state of charge
- Fuel tank
Sensors
- Amperage sensor (must be fused and isolated)
- Voltage sensors (must be fused and isolated)
- Battery temp sensors
Reference
Touch screen LCD with wide viewing angle
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