Lotus Engineering has unveiled a new, range-extending engine for series hybrid vehicles ahead of the Frankfurt Motor Show. The new engine promises to be one of the most efficient powertrains ever used in a hybrid vehicle.
At the heart of the system is a 47 horsepower 1.2L three-cylinder engine. However, unlike typical engines, the Lotus-designed Range Extender uses a unique aluminum monoblock construction. By casting the cylinder block, cylinder head and exhaust manifold into one unit, Lotus managed to cut costs, improve efficiency and improve durability.
Similar in design to a diesel train engine, the 1.2L is mated to an electricity generator. Depending on conditions, that generator can either send power to the vehicle’s electric motor or divert power back to the car’s battery pack. Lotus ’ engine is designed to work at two specific intervals, one at 1,500 rpm — developing 15 kW — and the other at 3,500 rpm, making 35 kW.
No production application of the Lotus engine have been announced, but we wouldn’t be surprised to hear something at this month’s Frankfurt Motor Show.
