Audi is the first time using this technology of 'Cylinder on Demand "(COD) is the Audi S6, S6 Avant S7 Sportback and S8 2012 are equipped with 4.0 TFSI engine. Audi is now applying to the COD 4 engine cylinder 1.4-liter TFSI found in the Audi A1 is capable of producing 138 hp and 250 Nm of torque.Audi A1 This powerful engine is able to record the fuel consumption with a dose of 24.4 km / liter with CO2 emissions of 109 g / km. Compare this with the 1.4 liter TFSI engine with no COD gives 18.8 km / liter with CO2 emissions of 122 g / km.
This technology serves to disable two of the four cylinders when the vehicle does not require a large force. You do this by closing the intake valves and exhaust in the cylinder to the second and third shift through additional mechanical camshaft (cam shaft) so that the valves do not lift (open).
Before this happens in a cylindrical combustion chamber is filled with fresh air, while the fuel injection and ignition is turned off. As a result only the cylinder number one and number four are working to give power, making it more efficient.
When the system reads the changing circumstances that require additional driving power of the engine, then the COD will automatically disengage the four-cylinder that will work simultaneously.
COD is ready to work all the time, and Audi has developed a control logic that monitors driving conditions and behavior. When driving conditions is true, the system will notify the COD has been active through the indicator lights are on intrument cluster.
COD will disengage automatically if driving conditions change either when the driver hit the gas pedal and brake pedal. The transition process took place very smoothly and it only takes one round of the camshaft.
AUDI has released the secret of the fuel-saving technology that is named by 'Cylinder on Demand "(COD) on YouTube, which illustrates how the valve control system plays a major role in these technologies.
