1.5L REVOTORQ ENGINE 90 H. FUEL SYSTEM Introduction 1.5 L engine incorporates a new technology that injects diesel into the cylinders, through electronically controlled fuel injectors. The fuel is pre pressurized before being injected into the cylinder. Description A tube or common rail having fuel at constant high pressure connects all the injectors. The high pressure in the common rail ensures that when fuel is injected, the fuel breaks into fine particles and mixes evenly with air, thereby leaving little unburned fuel, hence increasing fuel efficiency and reducing pollution. The common rail technology also reduces noise. 1.5 CRAIL System The 1.5 CRAIL engine from TATA uses DELPHI high pressure pump to supply diesel to cylinders, through a common rail and electronically-controlled injectors. The high pressure in the common rail ensures that when fuel is injected, the fuel breaks up into small particles and mixes evenly with the air, thereby leaving little un-burnt fuel, thus reducing pollution. The common rail principle has been used to cut out the noise factor which is associated with diesel engines. The brain of 1.5 L engine is Electronic Control Unit (ECU), which aids engine functioning at its optimal capacity. The ECU continuously receives signal from sensors installed at various locations in the vehicle. The ECU also receives continuous input from rail pressure sensor, which monitors the fuel pressure depending on engine speed and load. Depending on the position of throttle pedal, the ECU sends signal to high pressure pump through Inlet Metering Valve (IMV), to send the required quantity of fuel to common rail, thus improving the fuel consumption. The fuel gets distributed through the common rail to each electronically controlled injector. The ECU then sends signal to the injectors, on the quantity of fuel to be injected to produce the required power. The fuel is injected into the combustion chamber at specified time and pressure, thereby increasing the power output and efficiency. The entire process takes less than a second. Finally, to control the exhaust emission, the Exhaust Gas Re-circulation (EGR) valve returns unburnt fuel to the combustion chamber for further combustion, thereby reducing the release nitrogen oxide and other particulate matter to atmosphere. Features of 1.5 CRAIL system 1.5 CRAIL is powered by 1.5 CRAIL engine uses advanced Delphi 1600 bar electronic common rail injection system. The ECU constantly monitors functioning of various sensors and actuators and detects the faults generated in the system and indicates the status of fault through the check engine lamp. 1.5 CRAIL engine automatically adjusts to suit External environment conditions. Cylinder balancing: The engine speed is well balanced by reducing cyclic variations in the engine as all the parameter of injectors/injection system, are controlled by ECU. Anti-Oscillation Strategy (AOS): The AOS reduces jerks during sudden accelerations. The engine speed, vehicle speed and gear change is continuously monitored and adjustments are made to enhance driving pleasure. Advantages of 1.5 CRAIL Technology Electronically controlled fuel injection system. High pressure injection (1600 bar) for better emission and pilot injection to reduce noise, vibration and harshness (NVH). Highest power and torque. Excellent drivability. Improved grade ability / restart ability. Excellent cruising ability, lower fuel consumption Improved noise characteristics. Smoother running and enhanced driving pleasure.
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