1.2L REVOTRON Bi FUEL CNG ENGINE 95 CNG FUEL SYSTEM COMPONENTS 1. CNG Fuel Injector 2. CNG Fuel Rail CNG delivered to the intake manifold through the fuel rail. . The timing of injection and quantity is controlled by the EMS ECU through PT sensor at the rail end. 3. CNG Fuel Tank Function: CNG is stored in a high pressure cylinder at a pressure of 200 bar (working pressure). The maximum storage pressure of CNG in cylinder is up to 260 bar. Mounting Location: The CNG cylinder is located in the boot of the car mounted on the rear floor at four points in a cradle. 4. Regulator The Pressure Regulator reduces the CNG pressure from 200 bars (working pressure) to 4 bar. A 15 microns filter is inbuilt inside the Pressure regulator for filtering CNG coming from the tank. An electrical solenoid is also mounted on the Pressure regulator that allows and stops gas flow to Regulator. There is an over pressure relief valve which automatically opens if pressure inside regulator increases up to 10 ± 2 bar. A high pressure sensor is also connected on the inlet of the pressure regulator is used for displaying the quantity of CNG in the tank on the instrument cluster. Working Principle: The regulator supplies gas at the working pressure to the injectors. This is done by decreasing the pressure of the gas coming from the CNG tank (normally at 200bar) by expansion process. The output pressure is calibrated to maintain constant output pressure of 4 bar. Mounting Location: Pressure regulator is mounted in the Engine compartment on the firewall. A solenoid valve is integrated on the inlet of the pressure regulator. Technical Specifications of Solenoid coil: Nominal Voltage: 12V DC Operating voltage: 8V to 16V Current Consumption: 0.6 to 1.85 (at 20 degree Celsius) Resistance: 8.65 to 9.95 Ω (at 20 degree Celsius) The CNG Pressure Regulator is not a serviceable part. The CNG pressure regulator and CNG LP filter are both assembled on the same bracket along with the LP hose that connects the pressure regulator to the LP filter. For removing the pressure regulator, the assembly consisting of the pressure regulator, the filter along with the hose connecting the two needs to be removed. Below is the procedure.
RkJQdWJsaXNoZXIy MTIwNTUz