Cylinder Deactivation (CDA)

CDA is a modular valve actuation technology that shuts off all or some engine cylinders in certain conditions.  This technology has been adopted in the USA and is contributing to achieving some of their emissions reduction targets and low-load cycle emissions.

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Cylinder Deactivation (CDA)

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How it works

• CDA is usually used on V6 or V8 engines to reduce engine displacement by turning off a number of cylinders, however, this depends on engine size and vehicle
• It is done by hydraulically managing the valvetrain to keep exhaust and intake valves closed on certain cylinders¹⁷. 

Features:

• Reduces fuel consumption and improves SCR temperatures in all operating modes
• While increasing efficiency and cutting emissions, CDA can improve fuel economy by up to 25%
• This technology can reduce CO2 emissions by 12% and NOx emissions by 77% in a low-load cycle
• Reduced fuel consumption requires less maintenance, reducing total cost of ownership

Typical use case:

Gasoline passenger cars and light trucks, diesel-powered heavy trucks. CDA is prevalent in big-bore petrol engines in Australia and is likely to be implemented in light diesel trucks with the adoption of Euro VI standards.

¹⁷HDT Trucking Info, How Cylinder Deactivation Can Help Meet 2027 Emissions Targets, https://www.truckinginfo.com/10186582/jacobs-technology-truck-tour-demonstrates-cylinder-deactivation-technology#:~:text=Cylinder%20Deactivation%20and%20NOx%20Emissions%20Reduction&text=The%20resulting%20higher%20exhaust%20temperature,maximizing%20its%20NOx%20reduction%20efficiency