Jacobs’ CDA technology passes verification testing


Jacobs’ cylinder deactivation technology has been proven to deliver better fuel economy and lower emissions following independent verification testing.

Testing focused on NOX emissions during cold startups, low-load cycles and engine idle conditions – all representative of real-world driving. Experiments were carried out on a Navistar 13-liter engine equipped with the company’s CDA (cylinder deactivation) technology, and results show that fuel consumption was improved by 5% over baseline testing when increasing exhaust temperatures and limiting the cool-down of the selective catalytic reduction. By creating higher operating temperatures in functioning cylinders, the technology is able to further reduce greenhouse gases.

A hydraulically activated mechanism is integrated into a collapsible valve bridge system for engines with an overhead camshaft, while cam-in-block combustion engines use a collapsing pushrod system. When teamed with a disabled injection system, a powertrain can shut off a selected cylinder in any combination. The invention has also proved beneficial when applied to heavy-duty diesel engines found in commercial trucks. 

Further demonstration of the CDA system under low load cycles showed that a raised exhaust temperature reduced NOX emission from the tail pipe by 86%, while also reducing CO2  and fuel consumption by 12%. SCR NO conversion also increased from 48% to 95%.


About Author

After spending the past six years working as a mechanic for various motorsport and high-end performance car companies, Callum recently joined UKi Media & Events as an assistant editor. In this role he will use his vast practical knowledge and passion for automotive to produce informative news pieces for multiple vehicle-related sectors.

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