SAFARI

FUELSYSTEM 2.2LDICOR

Introduction toDicorSystem

1. The DICOR engine uses DELPHI high-pressure

pump and a common rail for supplying all the

cylinders with high-pressure diesel through the

electronically-controlled fuel injectors. High

pressure results in better atomisation which leads

to complete combustion.

2. Common-rail is key to better diesel engine

performance, since more accurate high pressure

injection results in more efficient fuel combustion.

It also injects the fuel only when it is required

there by increasing fuel efficiency. It helps the

engine to create a perfect blend of power and

fuel economy.

3. The brain of the DICOR engine is the ECU

(Electronic Control Unit) which keeps the DICOR

engine functioning at its optimal capacity. It

continuously receives signal from various sensors

to calculate the timing and quantity of fuel

required by the engine with complete flexibility.

Besides the ECU also controls Engine cooling

electric fans,A/C, EGR, VNTand diagnosis etc.,

4. In addition to the other sensors, the ECU also

receives continuous inputs from the rail pressure

sensor whichmonitors fuel pressure. The ECUcan

thus keep the system pressure at an optimal value

as per the engine speed, load and various

operating conditions. For example, if the pedal is

pressed, depending on the amount of pedal

pressed, the accelerator pedal sensor

immediately sends a signal to the ECU. SAFARI

DICOR has “Drive by wire” technology where in

Driver demand translation is done through ECU.

5. The ECU determines the load required by the

engine to meet the driver demand. It then sends

a signal to the high pressure pump through the

IMV ( Inlet Metering Valve ) to send the exact

amount of fuel to common rail to meet the

requirement. The Inlet Metering Valve determines

the quantity of fuel required to be pumped to the

rail depending on the engine speed & load and

pressurises the same thus avoiding wastage of

fuel. This helps in improving the fuel consumption.

6. The ECU also tells the injectors exactly whenand

how much to inject, to produce the amount of

power actually needed.

7. The high pressure pump has an internal lift pump

to draw the fuel from the fuel tank. (In case, the

pedal is released abruptly the excess fuel is

recycled back into the fuel tank via the injectors,

through the venturi and fuel return lines).

8. The desired amount of fuel is pumped into the

common rail after taking into account the current

fuel pressure (as detected by the rail pressure

sensor and sent to the ECU).

9. The fuel gets distributed through the rail to

theindividual electronically controlled injectors

into the cylinders.

10. The fuel is injected into the combustion chamber

at the specified time and pressure. As a result it

increases the power output and vastly enhances

the fuel efficiency.

11. In addition the ECU commands the injectors

toinject a small amount of fuel in to the cylinder

before the main injection happens. This pilot

injection helps to reduce the instantaneous

combustion which causes the traditional Diesel

‘Knock’. As a consequence there is far less noise,

vibration and harshness that is conventionally

associated with DI diesel engines.

12. This entire process happens in tiny fractions of a

second.

13. Finally to control the emission, the EGR (Exhaust

Gas Recirculation) valve along with EGR cooler

does its bit to reduce nitrogen oxides and

particulate matter content in the emissions by

effectively managing exhaust gas and unburned

fuel by returning it to the combustion chamber

for further combustion events.

14. SAFARI DICOR is equipped with Fuel filter &water

separator (Sedimenter with water sensor)

designed to filter out external particles in filter &

separate water from Diesel. The water sensor in

sedimenter gives an alarm to the Driver through

a Dashboard indicator when the water level

increases which indicates presence of water in

fuel.