Fuel Saving Onboard Fishing Vessels through Hydraulic/Pneumatic Hybrid Propulsion/Power Technology

Implemented Application of Hydraulic/Pneumatic Hybrid Propulsion System

• Suitable for heavy-duty machineries: Vehicles, Trucks, Vessels, Power Machineries
• Fuel economy between 30-70 %
• Decrease CO₂, NO_X, and SO_X emissions from the engine
• No battery is required by using a hydraulic/pneumatic accumulator
• High regeneration efficiency
• Due to the hydraulic motor direct drive wheel, it produces less mechanical loss
• The high power density is about 5 kW/kg while 0.5 kW/kg for the electric hybrid system
• Lower system and maintenance cost than the electric hybrid system
• The hydraulic regeneration system achieved the better energy available for acceleration than the electric regeneration system
• Accumulator requires a small installation space
• Reduce exhaust gases during acceleration
• Downsizing of main engine 30-50 %
• Efficient storage and reuse of regenerative
• The braking energy of vehicles

How to Apply Hydraulic/Pneumatic Hybrid Propulsion/Power for Fishing Vessel? (Development Perspective)

Operation of series hybrid hydraulic/pneumatic propulsion system:

• Recovery/braking mode: the motor uses the momentum of the flywheel-propeller to pressurize fluid from the low-pressure accumulator and store it in the high-pressure accumulator. This process recaptures about 70 % of the energy lost during braking.
• Short cruising mode: hydraulic pump/motor only uses high-pressure fluid from the high-pressure accumulator to drive the flywheel-propeller.
• Extended cruising mode: After a short cruising mode, pressure in the high-pressure accumulator will drop to a setting point, and the engine will turn on and begin to pressurize fluid from the low-pressure accumulator to drive the pump/motor. The excess pressure from the system will be stored in the accumulator.

Operation of parallel hybrid hydraulic/pneumatic propulsion system:

• Recovery/braking mode: 70% of kinetic energy from flywheel-propeller’s motion recaptured by hydraulic motor and stored in high-pressure accumulator
• Economy mode: energy stored in the accumulator during braking is used alone to accelerate the flywheel-propeller. Once the accumulator is emptied, the engine will begin to perform the acceleration.
• Accelerating mode: flywheel-propeller accelerated by stored energy in the accumulator and the main engine, until the accumulator is emptied, the engine will completely acceleration.