Upcoming diesel engine emission regulations will require significant reductions in NOx and CO2. The key to achieving this is maintaining the aftertreatment temperature in a sweet spot and maximizing the engine's thermodynamic efficiency. Eaton has developed several variable valve actuation technologies for medium- and heavy-duty engines addressing both needs:
Our VVA capsule approach provides flexibility which enables modifications to the basic cam profile on the fly. Oil commands to different valves can force the valve open or keep them closed when needed, reducing the amount of air going through the cycle, increasing exhaust temperature and improving thermal efficiency.
The LIVC capsule can keep the intake valve open a longer time, which improves the air flow at high engine load. The same type of capsule on the exhaust valve can open it early for higher temperature, or pulse open it during a compression stroke for engine braking.
This modular and flexible allows the same capsule with different oil commands achieve multiple functions allowing OEMs flexibility and choice in the design space. In addition, these solutions are more cost effective than additional aftertreatment.
Eaton’s capsule technology can be employed to modulate the intake valve to achieve either early or late valve closing.
Changing the duration of the intake event enables the powertrain engineer to deploy Miller cycle combustion and achieve their fuel economy objectives.
Eaton’s capsule technology can be employed to modulate the exhaust valve to achieve early exhaust valve opening during a firing event.
Opening the exhaust valve early hotter exhuast gases into the exhaust system. This can be used in the vehicle's thermal management strategy to optimize catalyst efficiency and emissions.
By deactivating the valves on one or more cylinders, the working cylinders are forced to operate at lower Air/Fuel Ratios. This works to increase the exhaust temperatures and ultimately improve emissions through improved catalyst efficiency. Simultaneously, a fuel efficiency benefit is possible.
Eaton’s deactivation technology is available for medium- and heavy-duty diesel engines applications and all valvetrain types.
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