A hybrid electric system for HGVs capable of delivering 1,140hp and more than 5,000Nm of torque has been developed in Finland.

The two companies behind the technology, Visedo and Sisu Auto, said it marks a "breakthrough" in hybrid electric technology that will give operators the power and performance they need, while also reducing fuel and emissions.

A proof-of-concept vehicle, unveiled at Finnish trade show Kuljetus 2017, integrates a parallel hybrid drive: this draws power from both an electric motor and a diesel engine connected via the same axle.

The electric motor assists the diesel engine during peak periods and charges energy storage during the off-peak via supercapacitors.

Locating the electric motor between the engine and gearbox means no modifications are needed for the existing chassis or suspension structure.

Visedo system solutions manager Risto Tiainen said: “We’re proud to be giving Europe its first look at such a breakthrough hybrid truck drive system that’s capable of delivering breakthrough power and performance while saving fuel and reducing emissions.

“After delivering pioneering hybrid and electric power for passenger buses, Visedo is proud to be powering the next generation of cleaner truck transport solutions.”

The electric drive system was developed to work in parallel with the Mercedes-Benz OM471 and OM473 diesel engines, which are used in the Sisu Polar truck range.

While the main objective for Visedo and Sisu was to reduce fuel consumption and emissions, the powerful hybrid system also boosts available low-speed torque. It enables the use of the vehicle with or without electric power since the drive line is mechanically continuous from the diesel engine to the axle.

Power is delivered via a permanent magnet motor, while the mechanical powertrain is controlled by an inverter and PowerBOOST DC-DC converter. Energy is stored with the company’s supercapacitor unit.

The system supplies additional power and charging automatically, allowing the driver to concentrate on the road unless they choose to use a bypass function and take control.