The New 3.5L V6 Gasoline Engine Adopting the Innovative Stoichiometric Direct Injection System D-4S

Authors

N. Tsuji, M. Sugiyama, S. Abe, Toyota Motor Corporation, Toyota-shi

Year

2006

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 622

Summary

A new 3.5L V6 engine was introduced for the new Lexus sedan vehicles, GS350 and IS350 in Japan in August 2005. In 2006, this engine will be adapted to the power source of the new hybrid rear wheel driven vehicle GS450h. This new engine uses a newly developed stoichiometric direct injection system with two fuel injectors in each cylinder (this system is called D-4S: Direct injection 4-stroke gasoline engine system Superior version). One is a direct injection injector generating a dual-vertical-fan-shaped spray with wide dispersion, while the other is a port injector. This new fuel injection system can maximize the DI advantage for full-load performance. Simultaneously the optimisation of the intake and exhaust system and the increase of stiffness of the moving parts such as the timing chain system and the valve train system enable a specific power of 67kW/L and 234kW at 6400r/min to be achieved, placing it near the top of all naturally aspirated production gasoline engines in the world. Additionally, employing the dual-VVTi system (intake and exhaust VVT system) and the long dual exhaust pipe, an excellent maximum torque of 380Nm at 4800r/min was achieved while keeping 90 percent of maximum torque for a wide engine speed range from 2000r/min to 6500r/min. During partial load and cold-start condition, simultaneous injection by the two injectors can obtain stable combustion and achieve low fuel consumption and low emission level, which enable the GS450h to meet the most stringent emission standard SULEV.

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