ENGINE 6 Knock Control: A sensor mounted on the engine detects when the knock occurs and allows the ECU to determine on which cylinder knock is occurred. Then the Ignition and fuelling corrections are applied to prevent further knock and thus protecting the engine from any damages. Further an intelligent software strategy enables a ‘Cylinder selective’ knock control, despite the ignition is ‘grouped’. Gear Ratio Determination: Employing different calibrations for open loop Idle control and fuel cut off depending on which gear is currently selected can enhance Drivability. Gear ratio, and hence the gear engaged, is calculated from the vehicle’s measured engine speed and road speed. This input is further synchronized with the ‘Anti- surge’ functions for a smoother drivability during the transients (accelerations and decelerations). Purge Control: Fuel vapours generated in the fuel tank is stopped in a canister, in order to limit the hydrocarbon emissions into the atmosphere. The vapours stored in the canister are purged into the engine under controlled conditions via a Purge valve to minimize any detrimental effects on drivability or on the emissions. Irrespective of the mode of fuel, the purge control mechanism vents the fuel vapours to limit the evaporative emissions. Engine Speed Limiting: Engine speed is limited through ECU. The cut off is introduced progressively to make the operation smooth to the driver. Vehicle Speed Limiting: The vehicle speed is limited from over speeding to provide safety and protection. A smooth vehicle speed cut off is applied in order to have a better drive ability feel. Gear Position Speed Limit in Petrol Mode (kmph) Speed Limit in CNG Mode (kmph) Petrol above low fuel level in Petrol Tank Petrol below low fuel level in Petrol Tank 1st 35 35 30 2nd 60 60 55 3rd 90 90 75 4th 105 105 105 Auxiliary load Input Information: Auxiliary drive like power steering, Air-conditioning and Alternator load information are taken into consideration in order to have a better idle speed control and the drive ability. CNG EMS OVERVIEW: Tata MPFI Bi-fuel CNG BS IV uses the most advanced Gas Injection System. ECU controls the operations in gasoline as well as CNG. CNG SENSORS AND ACTUATORS The EMS for CNG injection has the following EMS components in addition to the standard Petrol EMS components. CNG injectors. Pressure And Temperature (P&T) Sensor on CNG rail Safety Shut-Off (Solenoid) Valve on CNG tank. Safety Shut-Off Valve (Solenoid) on pressure regulator. Fuel Selector Switch (FSS) Tank pressure sensor in pressure regulator The CNG system other than the EMS components has the following mechanical components CNG tank / Cylinder Pressure Regulator with tank pressure sensor CNG L.P.Filter CNG Rail with P & T sensor. CNG L.P. lines. CNG H.P. lines.
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