TIAGO

1.05L REVOTORQ ENGINE

H. FUEL SYSTEM :

Introduction :

1.05 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 pres-

sure 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 pollu-

tion. The common rail technology also reduces

noise.

1.05 CRAIL System :

The 1.05 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 associat-

ed with diesel engines.



The brain of 1.05 Lf 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 Meter-

ing Valve (IMV), to send the required quantity of

fuel to common rail, thus improving the fuel con-

sumption. The fuel gets distributed through the

common rail to each electronically controlled in-

jector. 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 pro-

cess takes less than a second.



Finally, to control the exhaust emission, the Ex-

haust Gas Re-circulation (EGR) valve, along with

EGR cooler returns unburnt fuel to the combus-

tion chamber for further combustion, thereby

reducing the release nitrogen oxide and other

particulate matter to atmosphere.

Features of 1.05 CRAIL system :



1.05 CRAIL is powered by 1.05 CRAIL engine

uses advanced Delphi 1600 bar electronic com-

mon rail injection system.



The ECU constantly monitors functioning of vari-

ous sensors and actuators and detects the faults

generated in the system and indicates the status

of fault through the check engine lamp.



1.05 CRAIL engine automatically adjusts to suit

External environment conditions.



Cylinder balancing: The engine speed is well bal-

anced 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 reduc-

es jerks during sudden accelerations. The engine

speed, vehicle speed and gear change is contin-

uously monitored and adjustments are made to

enhance driving pleasure.

Advantages of 1.05 CRAIL Technology :



Electronically controlled fuel injection system.



High pressure injection (1600 bar) for better

emission and pilot injection to reduce noise, vibra-

tion 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 pleas-

ure.