Yanmar partners with Transfluid on new hybrid system

Yanmar's 6LY440 is a 5.8 litre six-cylinder engine Yanmar's 6LY440 is a 5.8 litre six-cylinder engine
Industry Database

As part of its development towards offering complete engine and transmission packages, Japanese diesel engine manufacturer Yanmar has teamed up with the Italian company Transfluid to offer a hybrid system.

The new system is based around Yanmar Marine’s new diesel engine, the 6LY440. This development follows over a year of testing the system, first on a test bench and then a further year on trials at sea.

Unveiled recently the 6LY440 is a 5.8 litre six-cylinder engine rated at 324kW at 3,300rpm with an alternative version, the 6LY400 designed for heavier duty and producing 400 hp. In the hybrid system the Transfluid unit is an HM2000-40 parallel system that comes equipped with a 40kW permanent-magnet electric motor/generator. Incorporated into this is a 2:1 ratio marine transmission gearbox with a low final drive to the propeller shaft. Battery power is included with the package and this comprises a DNV GL type-approved LiFePO4 battery that can produce 19.2kWh of energy at 96V DC.

The first section on the engine side incorporates a dry clutch unit that is operated by a solenoid valve which enables the engine drive to be disconnected so that the electric motor can take over. The output shaft from the clutch is then connected to the electric motor/ generator which is installed above the bell housing in a parallel mounting. The main drive then continues to the gearbox in the normal way and on to the propeller shaft.

These units can offer combined operation in three modes, the first being when the motor/generator is used for battery charging or supplying the vessel’s domestic and auxiliary requirements. The second its to have the vessel operating under electric power alone when the diesel engine drive is isolated and battery power supplies the electric motor. The third is to use the electric power to boost the diesel power output so that diesel and electric motors operate in tandem. Transitions from electric to diesel mode and vice versa are automatic and can be performed independently of the vessel’s speed. All commands are integrated into a Transfluid-supplied control lever.

One of the benefits of this hybrid system is that it can provide a degree of redundancy in single engined boat by offering the capability to operate under electric power independent from the diesel power.

By Dag Pike

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