Jacobs Vehicle Systems has announced a collaboration with the Center for Alternative Fuels, Engine and Emissions (CAFEE) at West Virginia University to further define the benefits of Jacobs’ Cylinder Deactivation (CDA) and Early Exhaust Valve Opening (EEVO) systems on heavy-duty diesel engines for commercial vehicles.
With CAFEE’s expertise in emissions reduction research and Jacobs’ long history of partnering with OEMs to provide safe, reliable and efficient solutions for commercial vehicles, the two engineering groups will combine resources to further understand the full potential for CDA and EEVO in the market, with a focus on testing trucks in low load operation. The joint research team will use both the engine laboratories at Jacobs in Bloomfield, CT, and CAFEE in Morgantown, WV.
Jacobs’ CDA improves fuel economy by selectively preventing the intake and exhaust valves from opening on designated engine cylinders. When combined with the elimination of fuel injection, the engine operates with the fuel consumption of a smaller engine. Emissions are reduced, particularly at lower loads, because CDA achieves higher exhaust temperatures in the operating cylinders and makes it possible to maintain optimal after-treatment temperatures, the company says.
Jacobs and CAFEE research groups will measure the fuel economy and engine operational improvements of CDA, including how to keep the aftertreatment system hot and to safely convert engine-out NOx and particulates, while quantifying the vibration characteristics of the engine in various deactivation modes.
Jacobs’ EEVO reduces emissions by opening the exhaust valve during the expansion or power stroke of the engine cylinder, which releases high energy expansion gasses directly to the aftertreatment system, allowing for faster warm-up of the Selective Catalytic Reduction (SCR) system. This enables the earliest possible conversion and removal of NOx emissions from the exhaust. The company says Jacobs’ engineers will work closely with CAFEE counterparts to determine the benefits of EEVO in combination with rapid warm-up strategies, to ensure the aftreatment system is operational quickly, even in cold-start conditions.
“WVU CAFEE is proud to team up with Jacobs to research advanced technologies that will lower emissions and improve heavy-duty engine efficiency. Cylinder Deactivation and Early Exhaust Valve Opening strategies are promising pathways for improving thermal management. Our collaborative team of experts from the industry and academia are in the forefront of fine tuning these strategies to production-ready technology,” says Arvind Padmavathy, assistant professor, mechanical and aerospace engineering, West Virginia University.
Steve Ernest, vice president, engineering and business development, Jacobs Vehicle Systems, says, “As worldwide emissions are continually scrutinized and target markets such as California look to further reduce tailpipe NOx output, engine manufacturers need proven mechanisms and technologies that can keep the aftertreatment system hot and improve overall fuel economy. Jacobs is continuing to bring these solutions to the market.”