In-use emissions report for Achates heavy-duty OP diesel shows substantial margin to most stringent EPA NOx proposed regulation
Achates Power has released initial in-use NOx measurements from the cleaner, heavy-duty diesel engine it developed in a project funded by the California Air Resources Board (CARB) and several partners. Achates Power previously announced the opposed-piston has entered fleet service with WALMART Corporation in a Peterbilt 579 tractor. (Earlier post.)
It is the only diesel engine operating on the road capable of meeting CARB’s 2027 regulation, which requires a 90% reduction in NOx emissions compared to current standards. In addition, the Environmental Protection Agency (EPA) recently released its proposed rule to lower NOx emissions levels for commercial vehicles across the entire United States. (Earlier post.) Option 1 from EPA is similar in many respects to the CARB regulation.
Both CARB and EPA have introduced Low Load requirements, in-use NOxmeasurement updates, and limits on permissible real-world emissions.
Before entering fleet service, the 400 hp, 10.6L 3-cylinder (6 pistons) engine was extensively tested, and the ultra-low emissions and improved fuel efficiency were measured and confirmed at the Aramco Research Center-Detroit. The University of California, Riverside (UCR) provided the in-use emissions measurements, using a Portable Emissions Measurements System (PEMS).
This article originally appeared in Green Car Congress April 20, 2022