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FIGURE 10.12
Alternative energy control unit design architecture.
This block also calculated the regenerative brake energy available during different
vehicle operation scenarios.
As shown in Figure 10.12, the alternative energy control unit design architecture,
4 high-voltage sense lines for sensing high voltage, 64 low-voltage sense lines for
sensing low voltage, 4 current sensors for sensing current, 10 temperature sensors
to sense 10 zones, an ambient air temperature sensor, a cooling system temperature
sensor, and an explosive gas detection sensor were interfaced with the sensor mea-
surement block. The sensor diagnostics block was designed to perform a power-on
sensor health and a periodic sensor health check and to report sensor errors upon
detection. If sensors were determined to be good, and no hybrid and motor safety in-
terlock fault or ECU health check faults were set, then a “NO FAULT” flag was SET.
Depending on the alternative energy available, available alternative energy torque
was calculated and fed to the torque arbitration and regenerative braking algorithm
block. In addition, vehicle parameters such as rpm, vehicle speed, acceleration, de-
celeration, emergency situation parameters, and vehicle torque demand also were fed
to this block to calculate the arbitrated torque required from the motor and the engine.
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