Hydraulic Launch Assist

With Eaton Hydraulic Launch Assist (HLA) systems, you can improve fuel economy and reduce emissions in vehicles that operate in continuous stop-and-go duty cycles, such as refuse trucks and buses. These hybrid hydraulic systems supplement conventional vehicle powertrains in two ways: Regeneration and Launch Assist.

Regeneration

During braking, the vehicle's kinetic energy drives the pump/motor as a pump, transferring hydraulic fluid from the low-pressure reservoir to a high-pressure accumulator. The fluid compresses nitrogen gas in the accumulator and pressurizes the system. This regenerative braking captures about 70% of the kinetic energy produced during braking.

Launch Assist

ADuring acceleration, a high-pressure accumulator meters out fluid to drive the pump/motor as a motor. The system propels the vehicle by transmitting torque to the driveshaft. Launch Assist features Economy Mode and Performance Mode.

• Economy Mode

  Economy Mode When the Hydraulic Launch Assist System is operating in Economy Mode, the energy stored in the accumulator during braking is used alone to initially accelerate the vehicle. Once the accumulator has emptied, the engine will begin to perform the acceleration. This process results in increased fuel economy.

• Performance Mode

  Performance Mode When the Hydraulic Launch Assist System is operating in Performance Mode, acceleration is created by both the energy the stored in the accumulator and the engine. Once the accumulator has emptied, the engine is completely responsible for acceleration. While fuel economy improvements are seen in Performance Mode, the greatest benefit is increased productivity.