Toyota is developing a next-generation hybrid powertrain for its future multi-pathway vehicle platforms. The system pairs a new family of four-cylinder 1.5-litre engines, available in naturally aspirated and turbocharged form, with lighter and more compact electric motors, power control units and inverters.
Toyota did not adapt an existing engine for electrified use. It developed the engine, hybrid system and power electronics together, and the new engines were designed for electrification from the start. The naturally aspirated version is intended to cover the performance range now served by the 1.8-litre engine and the current 1.5-litre three-cylinder unit.
Targeting More Than 15 Percent Better Fuel Economy
Toyota is targeting a fuel economy improvement of more than 15 percent. The company points to lower mechanical friction, improved thermal management, reduced electrical losses and lower aerodynamic drag as the sources of the gain. Closer integration of the engine, motors and power electronics is designed to reduce losses across the whole system.
One Platform for BEV, PHEV and HEV
The new multi-pathway platform is being developed to deliver BEV performance without compromise, and the compact hybrid system can be integrated into the same architecture. Hybrid and plug-in hybrid versions share the basic layout without changing vehicle silhouette, interior space or capability.
The smaller engine and hybrid package allow lower bonnet heights and more dynamic proportions, giving designers more freedom with vehicle shape.
Because BEV, PHEV and HEV models share one architecture, Toyota can spread development and production investment across higher combined volumes.
The common structure is also meant to let manufacturing adjust the powertrain mix to match customer demand. Toyota notes that energy conditions, customer needs and preferences differ by region and country, and says the approach is built to respond to that.
A Carbon-Neutral Role for Combustion Hybrids
Toyota presents highly efficient hybrid technology as a continuing part of its multi-pathway approach to carbon neutrality. It plans to increase external sales of the new engine and hybrid technologies in the coming years.
The system is also being developed to run on renewable and carbon-neutral fuels, which Toyota says extends the role combustion-based electrified vehicles can play in reducing emissions while battery-electric and fuel cell technologies continue to expand.