Computerized Engine Controls: COMPUVALVE

The compuvalve consists of a combined metering valve and control module assembly. The Compuvalve meters fuel electronically according to engine load and calculates spark advance for driveability and emissions. The compuvalve uses signals from several input devices and also controls output signals to various actuators. See INPUT DEVICES  and OUTPUT SIGNALS  . Input sensors are used to monitor the engine and signals the compuvalve to select the correct combination of injectors to deliver CNG fuel flow and also CNG fuel mass. On Contour, correct CNG fuel mass is delivered through the metering valve to the supply manifold and supply lines. On F-Series, correct CNG fuel mass is delivered through a low pressure hose, into the fuel rails and injector sleeves. The compuvalve calculates the CNG mass every spark event.

Compuvalve also incorporates a Fuel Absolute Pressure (FAP) sensor, Fuel Rail Temperature (FRT) sensor and a Manifold Absolute Pressure (MAP) sensor. When in ALT fuel mode, compuvalve will substitute gasoline fuel gauge level signal with a signal from the FUEL TANK PRESSURE (FTP) SENSOR (CNG) , located on the high pressure regulator (on Contour and F-Series), or from the FUEL LEVEL FLOAT (FLF) SENSOR (LPG)  located in the LPG fuel tank (F-Series only). This allows compuvalve to send a CNG fuel level signal (on Contour and F-Series) or LPG fuel level signal (F-Series only) to the gasoline fuel gauge.