Yellow Equipment Services

Electric Hybrid Propulsion for Transit Buses

Allison introduced its first electric hybrid propulsion system for transit buses more than 20 years ago. eGen Flex® is our next-generation solution, capable of operating up to 50% of a bus’s route in engine-off mode. The system’s electric-only mode is activated through geofencing technology and eliminates engine emissions and noise in pre-defined zones.

Inside eGen Flex®

Drive Unit

Featuring a multispeed gearbox with fully integrated electric motors built in, the drive unit provides propulsion while the engine is at zero speed, enabling full engine-off propulsion capability.

Rechargeable Energy Storage System

eGen Flex uses lithium-titanate (LTO) battery chemistry to support EV operation. The electric battery is recharged through a regenerative braking system, enabling storage of energy caused by the friction from braking that would normally be released as heat.

Inverter

Designed to improve vehicle efficiency and save space, Allison reduced the inverter to be one-third the weight and half the footprint of earlier generation electric hybrid systems.

Electrify Your Fleet with Allison's Revolutionary Electric Hybrid

Allison Transmission is leading the charge in innovative propulsion solutions. The eGen Flex®electric hybrid provides revolutionary capabilities and fully electric propulsion when you need it, without the added infrastructure requirements of full EV. Our electric hybrid systems continue to demonstrate bottom-line operating benefits for municipalities and fleets all over the world while delivering industry-leading performance, reliability and durability.

eGen Flex® Highlights

Improved Fuel Economy

Reduced Dependence on Fossil Fuels: Fleets that operate eGen Flex® can expect improved fuel economy of up to 25% compared to conventional diesel buses. The system’s electric battery is recharged through a regenerative braking system, eliminating the need for charging infrastructure. It also allows the vehicle to operate accessories, such as air conditioning and heat, at optimal efficiency with clean and quiet electric power.

Reduced Maintenance

Increased Vehicle Uptime: eGen Flex® eliminates inefficient belt-driven accessories and decreases the load on the engine. The regenerative braking system reduces brake wear and increases power to the wheels. In addition, the inverter utilizes WEG cooling, eliminating oil coolant lines from the drive unit. These factors all contribute to reduced costs for vehicle integration and maintenance.

Improved Sustainability

Protecting the Environment The system’s electric-only mode enables buses to operate in full EV mode using geofencing technology. This helps fleets reduce their carbon footprint and noise pollution, particularly in pedestrian-dense EV zones.

Yellow Equipment Services LLC,
Building number - 160,
Way number - 4902,
Rusayl Industrial Area, Muscat,
Sultanate of Oman,
Postal code:124
+968 9561 9537, +968 9921 8481
chandrasekar@yellowequipmentoman.com

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