Compressed Natural Gas (CNG) System

COMPRESSED NATURAL GAS (CNG) SYSTEM






Fuel from the Compressed Natural Gas (CNG) fuel tanks flows through the fuel tank lockoff valves, the manual fuel shutoff valve (Contour) high pressure shutoff valve (F150) and coalescent fuel filter to the gas regulator. The gas regulator provides a consistent system operating fuel pressure of approximately 100 psig. The fuel is passed to the Compuvalve. The Compuvalve meters fuel according to demand, calculates spark advance for maximum power, and registers fuel storage pressure on the gasoline fuel gauge when in ALT mode. A combination of sensors and inputs from the Powertrain Control Module (PCM) are used to monitor the engine and environment to provide closed loop control of fuel. Through speed density calculations, the Compuvalve determines fuel flow and air flow while adjusting the air/fuel mixture using internal injector valves. An air/fuel adjustment is made for each spark event. The fuel is then introduced into the gaseous fuel distribution manifold (Contour) or fuel rails (F-Series) and to the intake air system through the fuel injector sleeve assembly (F-Series).