BAE Systems announced advancements in hybrid-electric propulsion for buses and trucks, improving efficiency and reducing emissions. The latest systems integrate electric drive, energy storage, and power management for lower fuel consumption and optimized fleet performance.

1. Series-E Electric Hybrid System: A proven series-hybrid drive that uses an onboard generator to charge batteries, delivering diesel-electric operation without a mechanical transmission. It powers vehicle accessories electrically, cuts fuel use through regenerative braking, and lowers maintenance by decoupling the engine from the wheels.
2. Series-ER (Electric Range Hybrid) System: Extends electric-only driving by combining a larger battery pack with an onboard generator. Operators can define “zero-emission zones” where the engine shuts off automatically, reducing urban emissions and noise without relying on external charging infrastructure.
3. Series-EV Battery Electric System: A full battery-electric propulsion package offering zero tailpipe emissions. Featuring modular power electronics and high-torque traction motors, it supports opportunity, overnight, inductive, and conductive charging to maximize uptime and range for transit applications.
4. Series-H Fuel Cell Electric System: A hydrogen fuel cell variant delivering 100% zero-emission operation. It integrates fuel cells with batteries for route-independent service, powers all accessories electrically, and achieves over 300-mile range per fill, offering a durable alternative to battery-only drivetrains.
5. Energy Storage System (ESS-3G-32K): A high-capacity lithium-ion battery module that captures regenerative-braking energy and supplies peak power for electric-only operation. Its modular design allows easy capacity scaling to match vehicle requirements and boosts hybrid-electric performance.
6. Modular Power Control System (MPCS):  A scalable inverter architecture controlling primary traction motors. It enables OEMs to add or remove modules for battery expansion, optimizes efficiency with silicon-carbide semiconductors, and simplifies maintenance through a reduced-component, high-reliability design.
7. Dynamic Drive Traction Motor (DDTM): A permanent-magnet electric motor delivering high torque at low RPM for smooth acceleration. Its compact, liquid-cooled design integrates directly with the drivetrain, enhancing energy efficiency and lowering noise for both hybrid and battery-electric applications.
8. Modular Accessory Power System (MAPS): Replaces engine-driven accessories by supplying AC and DC power to HVAC, air compressors, and steering systems. Its modular, bidirectional converters reduce parasitic load on the engine, improving overall fuel efficiency.
9. Integrated Starter Generator (ISG): Combines starter and generator functions into one compact unit. It enables engine start-stop operation, regenerative energy capture, and seamless transition between electric and engine-driven modes, enhancing drivability and reducing idle emissions.

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Presentations - BAE Systems hybrid drive for refuse trucks data sheet BAE Systems is a world leader in the design of hybrid electric technology.   Presentations - BAE Systems HybriDrive Truck Data Sheet A detailed presentation of the heavy duty HybriDrive parallel propulsion system built to withstand the rugged demands and frequent stop and go operation of heavy duty vocational trucks.