COMMON RAIL SYSTEMS
COMMON RAIL, CRDI or " Common Rail Direct Injection" is the name of a direct injection system ofdiesel fuel under high pressure in internal combustion engines. Developed in the mid-1990s, initiallydeveloped for heavy vehicles and later adapted for light cars. The Commo Rail injection system has beendeveloped for better performance, increases fuel effi ciency and reduces gas emissions.
The operation of the Common Rail Diesel system consists of: The pressure generation is carried by apipe to the HIGH PRESSURE PUMP. The pump compresses the fuel and sends it to the rail hole(dispensing tube) through a high pressure conductor, which acts as a common high pressureaccumulator for all INJECTORS.
GUNS COMMON RAIL
Common Rail injectors receive pressurized diesel oil from the rail and inject it into the enginecombustion chamber. The injection is made commanded by the control box, which electrically triggersthe solenoid of each injector. With pressure is always available on rail.
A common rail injector plays an important role in the system, being responsible for the properfunctioning of the vehicle. Its function is to inject the fuel under high pressure into the engine cylinder with precision andcorrect pressures, determined by the electronic control of the module.
COMMON RAIL HIGH PRESSURE PUMPS
All Common Rail high pressure pumps have the same operationg principle: an engine-connected shaft, moves an internal mechanism with piston-like elements, which receive low-pressure diesel and pumps under high pressure according to the injection system demand. Differentiation between them occurs in four aspects: pumping capacity (in liters/hour), low pressure pump concept mechanical or electrical, rail pressure control device (DRV or M.Prop Valve) and possibillity of repair.
High pressure pumps can be divided into three different components: low pressure, high pressure and control.