Eaton Cylinder Deactivation – CDA system is the most direct way to reduce CO2 emission, and at the same time improve fuel economy through driving cycle. It overcomes the obstacles of designing a high performance engine that is optimized for fuel efficiency. CDA deactivates the cylinders of the engine whenever full power is not needed. In that way, remaining, active cylinders run in higher efficiency mode, increasing fuel efficiency.
Eaton is knowledgeable in engine air management. As such, they offer a variety of cylinder deactivation solutions for Type 2 (roller finger follower) valvetrains including:
- Hydraulic Lash Adjuster-based
- Roller Rocker Arm-based
- Roller Lifter-based
Eaton has focused its Cylinder Deactivation System offer mainly to the gasoline engines with Type II valvetrain. While typically applied to Type II engines mainly, they can also be designed for Type I (direct acting) and Type III (center pivot) valvetrains, often used for Medium and Heavy Duty Diesel engines. For Gasoline Type II engines with odd number of cylinders (3-cylinders) Eaton Dynamic Cylinder Deactivation systems allows large field of utilization of CDA function: up to 50% of engine load and up to 4000 rpm.
Eaton Cylinder Deactivation function could be incorporated (based on) different valvetrain components:
Hydraulic Lash Adjuster-based:
Latch Pin under HLA keeps part as solid if cylinder is activated. To deactivate a cylinder, the pin is withdrawn and when the cam presses on the RRA, the HLA collapses into its housing, rather than moving the valve.
Roller Rocker Arm-based:
Latch Pin holds the RR/A as one solid piece. To deactivate a cylinder, the pin is withdrawn and the RR/A becomes two concentrically pivoted pieces. When the cam presses on the roller, the roller arm pivots around the valve. Rocker arm and valve do not move.
Developed for, larger displacement, gasoline engines with pushrod type valvetrain.
Axial Cam-Shifting based, dynamic or traditional CDA.