Toyota developed a continuously variable valve lifting structure VALVEMATIC

Toyota Motor Co., Ltd. announced on June 12, 2007 that it has developed the continuously variable valve lifting structure "VALVEMATIC" and plans to apply it to the 2.0L engine of the new car recently launched. It is expected to be first equipped with the minivan "Noah OXY" and then gradually expand the application of this technology in other models.

The company plans to update its engine lineup by 2010 – the suction and exhaust are both continuously variable valve timing structures and have been equipped with 1.8L displacements in Corolla and Premio/Allion. "2ZR-FE" engine. VALVEMATIC will be set with the continuously variable valve timing structure in the high-end model of this engine, the 2.0L engine.

Regarding the continuously variable valve lifting structure, in addition to the German BMW "Valve Tronic" name for a variety of engines, Nissan Motors is scheduled to be listed in the fall of 2007 "Skyline Cool" will also be used as "VVEL" in the V-type 3.7L engine Equipped.

The detailed construction of the VALVEMATIC has not yet been disclosed, but it is characterized in that an actuator is provided at the rear end of the engine, and the shaft that is arranged side by side with the cam shaft can be moved in the longitudinal direction. In the Valve Tronic, although the fulcrum of the rocker arm is changed by rotating the eccentric control shaft, the same function is achieved by rotating the shaft. The advantages are: the fuel efficiency is increased by 5 to 10%, the maximum output power is increased by more than 10%, and the responsiveness when the accelerator is stepped on is also improved.

The reason for the improvement in fuel efficiency is that, in the low load area, the pumping loss caused by the squeeze throttle valve and the mechanical loss caused by the valve spring (Valve Springs) can be reduced. On the other hand, it is because in the high load region, it is possible to increase the output power by increasing the valve lift amount to draw in more air. In addition, instead of adjusting the amount of air through the throttle valve, by changing the amount of lift of the valve closer to the combustion chamber, the amount of air is instantaneously changed when the accelerator is stepped, and the responsiveness is also improved.