SmartSprocket™ Camshaft Torque Cancellation (CTC)

SmartSprocket™ is a patented device invented by Litens that provides improved control of timing system dynamics and results in complete elimination, or significant reduction of, system vibration. It consists of an engineered, non-round sprocket that introduces a controlled, periodic excitation in the system which, when combined with the existing system excitation, cancels the camshaft torsional vibrations thus reducing maximum dynamic belt or chain tension. A correctly designed and applied SmartSprocket™ is an extremely effective, robust and convenient solution - a technology that was recognized by the industry when Litens received the Automechanika Innovation Award in 2004.

Application of a SmartSprocket™ usually doesn't require any additional changes to the drive or the engine itself. Shape and phasing of the SmartSprocket™ are optimized using advanced computer simulation programs and confirmed through engine functional testing.

The direct benefits are numerous, including:

• Reduced timing error, particularly at resonance
  
• Reduced and controlled dynamic belt tension
  
• Possibility to use narrower and/or lower grade belt or chain
  
• Increased timing drive durability to ‘life of engine’ level
  
• Improved drive energy efficiency
  
• Reduced system noise level
  

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