Presentation on theme: " Modern & clean diesel system The common rail system of fuel injection was used in marine diesel engines during the early and mid-19th century.marine."— Presentation transcript:
The common rail system of fuel injection was used in marine diesel engines during the early and mid-19th century.marine diesel engines The common rail system of fuel injection is a simple and efficient system. The recent trend in the automobile industry is the usage of common rail direct fuel injection systems in some modern vehicles. Some of the engines in the automobile sector introduce this common rail system of injection not only in diesel engines, but also in petrol/gasoline engines.
It is a new technology and it is called common rail direct injection because there is only one plunger in the pump which supply fuel to the rail from where fuel is injected to the different nozzles (injectors).
Provide the diesel engine with fuel. Generate the high pressure needed for fuel injection and distribute the fuel to the individual cylinders. Inject precisely correct amount of fuel at exactly the right moment in time. In contrast to other injection system Common rail fuel injection system is an accumulator injection system.
COMMON RAIL FUEL INJECTION SYSTEM Low Pressure Circuit High Pressure Circuit ECU With Sensors
High –pressure circuit comprises: High – pressure pump with pressure – control valve The high – pressure accumulator (Rail )with the rail –pressure sensor Injectors, and The respective high – pressure connection lines.
ECU and sensors The common rail ECU evaluates the signals from the following sensors. Crankshaft – speed sensor, Boost – pressure sensor. Camshaft sensor, Accelerator-pedal travel sensor. Air temperature sensor. Air – mass meter and Rail pressure sensor.
PRE SUPPLY PUMP - electric - roller - gear Rail-pressure sensor (RDS). Injector High pressure pump. High- pressure accumulator (Rail). Pressure-control valve (DRV)
The electric fuel pump comprises of: 1.Electric Motor 2.Roller-Cell Pump 3.Non Return Valve
The roller cell is driven by an electric motor. Its rotor is mounted eccentrically and provided with slots in which movable rollers are free to travel.
Gear type fuel pump The drive gear wheel is driven by the engine. Delivery quantity is directly proportional to engine speed. Shut off is by means of an electromagnet.
The pump plunger moves downwards The inlet valve opens The fuel is drawn in to the pumping element chamber(suction stroke) At BDC, the inlet valve closes The fuel in the chamber can be compressed by the upward moving plunger.
Responsible for maintaining the pressure in the rail at a constant level.
Measures the pressure in the rail. Inputs the information to the ECU.
Common Rail is an EDC controlled injection system The ECU controls & monitors the complete injection process The sensors delivers all the measured values which are required in the process