Volkswagen implements cylinder shut-off system on a four-cylinder TSI engine in mass production, the first company to do so among the manufacturers in the world.
The high-tech system’s main function is to significantly lessen the fuel consumption by temporarily turning off two of the four cylinders during low to medium loads. In the 1.4-litre TSI, the cylinder shut-off allows a drop in fuel consumption by 0.4 liter per 100 km in the NEDC driving cycle.
Greater savings of up to 0.6 liter per 100 km is further achieved with the integration of the Start/Stop functionality, which deactivates the engine when in neutral gear. When driving at constant moderate speeds, one achieves the greatest benefits of this innovative technology.
In third or fourth gear at 50 km/h, savings could reach to almost one liter per 100 km. All in all, this fuel efficient TSI will meet the future EU6 emissions standard. Driving comfort is not sacrificed with high efficiency. In fact, when running on two cylinders only, the 1.4-litre TSI remains very silent and low in vibration, thanks to its exceptional engine balance.
Cylinder shut-off is active when the engine speed of the 1.4-litre TSI is in the range of 1,400 to 4,000 rpm and its torque is between 25 and 75 Nm. This is applicable to almost 70 percent of the driving distance in the EU fuel economy driving cycle.
Once the driver presses the accelerator pedal sufficiently hard, cylinders 2 and 3 are reactivated unnoticeably. The system obtains its signals from the accelerator pedal sensor in order to identify the driving mode.
The shut-off functionality is suppressed automatically if the driving demonstrates a non-uniform pattern such as those experienced when driving in roundabout traffic or in a sporty style on a country road.