SAFARI

ENGINE

Introduction of Dicor Technology

How does DICOR technology work?

The DICOR engine uses a 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.

Common-rail is key to better diesel engine

performance, since more accurate high pressure

injection results inmore efficient fuel combustion.

It also injects the fuel only when it is required

thereby increasing fuel efficiency. In fact, tests on

the Safari DICOR show that it helps the engine to

create aperfect blendof power and fuel economy.

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 signals from sensors on

temperature, air pressure, vehicle speedandother

factors to calculate the timing andquantity of fuel

required by the engine. Besides the ECU also

controls Engine cooling electric fans, A/C, etc..

In addition to the other sensors, the ECU also

receives continuous inputs from the rail

pressure sensor which monitors fuel pressure.

The ECU can thus keep the system pressure at

an optimal value as per the engine speed and

load. For example, if the pedal is pressed,

depending on the amount of pressure applied,

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.

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

requisition the additional amount of fuel to be

received by the 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.

The ECU also tells the injectors exactly when

and how much to inject, to produce the amount

of power actually needed.

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).

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).

The fuel gets distributed through the rail to the

individual 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 to

inject a small amount of fuel into the cylinder

before the main injection happens. This pilot

injection helps to reduce the instantaneous

combustion which causes the traditional Diesel

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

vibration and harshness that is conventionally

associatedwith diesel engines.

12)

This entire process happens in tiny fractions of a

second.

13)

Finally, the EGR (Exhaust Gas Recirculation) valve

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)

The most important thing in India is fuel quality.

Safari DICOR is equipped with Fuel filter &

water separator (Sedimenter with water sensor)

designed for Indian environment to filter out

external particles & separate water from Diesel.

The water sensor gives an alarm to the Driver

through a Dash board indicator when the water

level increases which indicates presence of

water in fuel.