Lamborghini S.p.A. will incorporate Maxwell ultracapacitors to support a stop-start idle-elimination system in all Lamborghini’s Aventador cars which will go into production in late 2012. The idle-elimination system is an important element of Lamborghini’s announced program to reduce its new models’ CO2 emissions by 35% by 2015.
The stop-start system restarts the 12-cylinder, 700 hp (515 kW) engine in 180 milliseconds, significantly faster than with conventional systems. Incorporating the six-cell ultracapacitor module for added cranking power to ensure efficient restarting for the Aventador also enabled Lamborghini to reduce the size and weight of the battery to further enhance performance.
The new Aventador also features a Cylinder Deactivation System (CDS). Under low load and at speeds of less than 135 km/h (84 mph), the CDS deactivates one cylinder bank, allowing the power unit to run as an inline six. The slightest movement of the gas pedal brings the full 12 cylinders back online. With the help of the stop-start system and the CDS, the average fuel consumption of the Aventador LP 700-4 drops by 7% to 16 liters/100 km (14.7 mpg US). At highway speeds of around 130 km/h (81 mph) the reduction in consumption and emissions is as much as 20%. In total the CO2 emissions of the Aventador have been reduced from 398 g/km to 370 g/km.
The stop-start system originally was designed by Dimac, Maxwell’s ultracapacitor distribution partner in Italy. The production system will be supplied by the Continental Engineering Services unit of Continental AG.
Stop-start idle-elimination systems reduce fuel consumption and emissions by shutting off a car’s internal combustion engine as the vehicle slows, and seamlessly restarting the engine when the driver requires to drive off. Ultracapacitors provide burst power to re-start the engine, relieving the car’s battery of high current, repetitive cycling that can shorten battery life.