Independent testing validates benefits of Jacobs' cylinder deactivation system
By Jim Gibbins - 1st March 2020
USA - Jacobs Vehicle Systems Inc of Bloomfield, Connecticut has completed testing with a recognised third-party laboratory, funded by the US Environmental Protection Agency (EPA), to quantify the fuel savings and emissions benefits of the Jacobs’ Cylinder Deactivation (CDA) technology. The tests were conducted on a 13-litre Navistar engine equipped with CDA.
Results from the tests showed improved fuel consumption of 5% over the baseline in the Hot FTP (Federal Test Procedure) cycle, while increasing exhaust temperatures and limiting the cool-down of the SCR system. To demonstrate the capability of the CDA system, the proposed CARB Low Load cycle was evaluated, and CDA was found to raise the exhaust temperatures so that tail pipe NOx emissions were reduced by 86%. CO2 and fuel consumption was reduced by 12%. SCR NOx conversion increased from 48% (baseline) to 95% (CDA). More extensive tests and results will be published under a joint paper at the April 2020 SAE World Congress.
