The new Toyota Optimal Drive D-4D & D-CAT engines use the very latest piezoelectric technology.
The solenoid injectors of the previous diesel engines have been replaced by new efficient piezoelectric injectors.
Piezoelectric injectors can 3 times more accurately control the fuel volume and the timing of the injection. The increased injection pressure - the highest injection pressures among systems of this type of 2000 bar - in combination with the new piezoelectric injectors leads to a better atomisation of the fuel, hence better mixing and combustion. More accurate control of fuel to volume ratio means less fuel used.
This state-of-the-art system achieves class-leading levels of power and torque, with high fuel efficiency.