Woodward OH-Series are proven electronic control systems for gas- and propane-fueled, medium- or heavy-duty vehicles. These systems provide clean-burning engines, strong performance and outstanding fuel economy, essential to OEMs worldwide. Whether you’re running CNG (compressed natural gas), LNG (liquefied natural gas) or LPG (liquid propane gas) in your medium- or heavy-duty vehicle, we have a control solution for you. Our integrated system of electronic controls, sensors, valves, and actuators work together to control precisely the air flow, fuel flow, exhaust flow, and combustion processes of the engine. This helps the engine meet mandated emissions levels with the fuel economy and reliability vehicle operators demand. Operating under an OH system, an engine can meet any targeted emissions level from Euro 2 to Euro 6 (or equivalent) while maintaining diesel-like drivability and excellent fuel economy.