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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 22 / 64

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A: A 5.9-liter diesel engine runs at an optimal controlled speed and is connected to a generator to produce electrical power for the drive motor and batteries. B: The electric motor drives the vehicle and acts as a generator to capture energy during braking. C: The batteries supply power during acceleration and hill climbing and store energy recovered during regenerative braking. D: The propulsion control system manages the entire system and optimizes performance for emissions, fuel economy, and power. Figure 1. BAE Systems HybriDrive Propulsion System

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