Jacobs’ CDA technology passes verification testing

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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%.

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About Author

After spending six years working as a mechanic for various motorsport and high-end performance car companies, Callum joined UKi Media & Events in February 2020 as an assistant editor. In this role he uses his vast practical knowledge and passion for automotive to produce informative news pieces for multiple vehicle-related sectors.

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