Engine braking and cylinder deactivation technologies are key technologies for meeting upcoming global emission standards. Well known for its engine braking technologies–for example, the Jake Brake and High Power Density (HPD) engine brake–Jacobs is also developing new and effective valve control technologies, that enhance engine performance and at the same time reduce emissions and improve the fuel economy of commercial vehicles with conventional and alternatives fuels. Jacobs emission solutions are seamlessly integrated into the valvetrain using technically proven and cost-effective solutions.

Jacobs technologies aims to lower CO2 and NOx simultaneously

Jacobs Cylinder Deactivation (CDA) can turn a six-cylinder engine into a three-cylinder engine or less, decreasing fuel consumption and keeping the aftertreatment system hot. Even when the engine is running at low loads, aftertreatment temperatures are maintained. CDA improves fuel economy because of the increased load on the cylinders that are still operating, while the switched-off ones are not fueled at all. Additionally, the system is designed to last the lifetime of the engine, unlike other emission technologies that need to be replaced or serviced.

To further enhance cylinder deactivation, Jacobs is teaming up with Tula Technology Inc., a mobility controls specialist that has been collaborating with Jacobs since 2019 and will join Jacobs as a co exhibitor at IAA Transportation. Tula’s dynamic skip fire (DSF) combined with Jacobs’ CDA means decisions about which cylinders to deactivate are made on an individual basis, and every engine rotation, to best meet torque demands and eliminate vibration.

Although Jacobs’ product portfolio contains different valve actuation technologies to serve various purposes, many of these are modular and compatible with each other. This gives OEMs the flexibility to specify one of Jacobs’ technologies individually or multiple technologies working together to meet the OEM’s needs.

One example is Jacobs’ High Power Density engine braking technology. If the engine’s valve train already includes the HPD rocker brake, it’s possible to also incorporate Cylinder Deactivation technology. HPD is modular to a standard Compression Release rocker brake as well; one can choose between the two while making use of the same base hardware. It’s also an option to add Variable Valve Actuation technologies that assist in meeting upcoming transient emissions and fuel economy targets.