Toyota has announced a series of newly-developed, highly fuel-efficient gasoline engines, and these are due to be utilised in the company’s models scheduled for partial redesign in the near future. In all, a total of 14 new engine variations will be introduced globally by 2015. No mention of how wide the range will be in terms of displacement solutions, but the theme keeps in line with the company’s primary focus on the non-turbocharged route.
The new engines leverage combustion and loss-reduction technologies refined from the automaker’s dedicated hybrid engines. Initially, two engines will form the base of the new series, a 1.3 litre Atkinson-cycle unit and a 1.0 litre design jointly developed with Daihatsu. Featuring combustion and loss-reduction technologies from the automaker’s dedicated hybrid engines, the new mills promise improved thermal efficiency and improved fuel effiency.
The design of the high 13.5 compression ratio 1.3 litre unit includes an intake port, which has a new shape that generates a strong tumble flow – where the air-fuel mixture flows in a vertical swirl – inside the cylinder. It also features a cooled exhaust gas recirculation (EGR) system, paired with Variable Valve Timing-intelligent Electric (VVT-iE). The new features, combined with idling stop and other functions, aid fuel efficiency gains of approximately 15% over that being obtained now. Maximum thermal efficiency for the unit is 38%.
A similar tumble flow-generating intake port is also found in the 1.0 litre engine, as is a cooled EGR system and a high compression ratio. In combination with an idling-stop function and various other fuel consumption reduction technologies, Toyota claims that vehicles equipped with the engine will have a maximum fuel efficiency improvement of approximately 30% over current vehicles.