Common Rail Direct Injection System CRDI, GDI, FSI

Introduction

Common Rail Direct Injection System CRDI in the case of diesel engines and Gasoline Direct Injection GDI or Fuel Stratified Injection FSI in the case of gasoline engines are some modern yet widely employed technologies used by leading car manufacturers world wide.

The technologies CRDI, GDI, FSI are the technologies that forms a part of fuel system of an automobile. All these technologies works on the very same concept ie the fuel is supplied directly via a common rail to which all the fuel injectors are connected.

This also adds to the advantage of the fuel system as it decreases overall weight of the system and stamps the automobile equipped with a modern tech.

This systems also ensures perfection and the precision for the best performance.

Components

• High Pressure Fuel Pump
• Common Fuel Rail
• Fuel Injectors
• Electronic Control Unit

Working Principle

All fuel injectors of the engines are connected to a common rail.

A high pressure fuel pump supplies pressurized fuel through fuel lines to the inlet of the common rail.

This common rail is closed from one end and take in the fuel from the other end via fuel pump.

The fuel stored in the fuel tank is then monitored through a number of sensors monitoring various specs and electronically controlled through the ECU.

These systems maintain the best optimum pressure of the fuel and also acts as a collective reservoir of fuel for all the injectors.

The fuel is continuously supplied to the injectors unlike the earlier conventional fuel injection pumps.

Advantages

The cars employed with these modern technologies are proved to be 25% higher torque and power units.

Great initial pickup and significantly reduced vibrations.

Disadvantages

Modern sophisticated technologies often comes with high costs.

These systems also requires more often repairs and high cost spare parts.

Originally published at https://www.carengineered.com on November 23, 2020.