RENAULT - BOSCH MD1CS006

FULL EMISSION REMOVAL

FULL EMISSION REMOVAL is a solution offered by combining DPF + EGR + ADBLUE modules as a single module.

DPF (Diesel Particulate Filter)

It is a filter added to the exhaust system in order to remove or reduce Particulate Matter that naturally occurs as a result of combustion in diesel engines.

Increasing back pressure is absolutely undesirable, especially in terms of engine performance and fuel consumption. This situation, that is, the clogging level of the DPF, is constantly monitored by the DPF's inlet and outlet pressure difference and temperature sensors. When the sensors detect that the DPF has reached a certain clogging point, the engine control unit increases the exhaust gas temperature with the help of additional fuel injections (considering a single injection time, after-injections made after the preliminary and main injections). In this way, it aims to burn the particles and remove them from the DPF. This process is called "Regeneration" process.

FUNCTION OF DPF (Diesel Particulate Filter)

1. Particle Filter:

DPF has a filter structure through which exhaust gases pass. This structure traps particles and keeps them in the filter while allowing gases to pass.

2. Regeneration:

Over time, the DPF fills with the particles it traps and becomes clogged. To prevent this situation, regeneration, which is the self-cleaning process of the DPF, is performed. Regeneration is the process of burning the soot accumulated in the filter at high temperatures and converting it into CO2 and water vapor.

Passive Regeneration: It occurs with the natural heat of the exhaust gases while the engine is running.
Active Regeneration: The engine control unit (ECU) initiates regeneration by increasing the temperature of the exhaust gases when necessary. This can be done using fuel injection or a heater.

3. Physical and Chemical Structure:

DPF is usually made from high temperature resistant materials such as silicon carbide or cordierite. Its internal structure consists of numerous small channels and pores, thanks to which particles are trapped and gases can pass freely.

COMPONENTS OF DPF (Diesel Particulate Filter)

Diesel particulate filter
Diesel particulate filter temperature sensor.
Diesel particulate filter pressure sensor.

PROBLEMS OF DPF (Diesel Particulate Filter)

Limp mode problem.
Malfunction light coming on (Check Engine Light)
DPF lamp remains on.
Increase in engine oil level.
Increased Fuel Consumption
White smoke seen in the exhaust.
Increase in Regeneration Frequency
Low engine performance

EGR (Exhaust Gas Recirculation)

It is a system that aims to reduce the heat generated as a result of combustion by directing (recycling) some of the exhaust gas in internal combustion engines back into the engine and into the cylinders, thus keeping environmentally harmful nitrogen oxide gases (NOx) under control. It is widely used in today's gasoline and diesel engines.

The mixture of fresh air entering the engine with burnt exhaust gas reduces the combustion temperature and (in diesel engines) the amount of excess oxygen. Since the formation of NOx gases accelerates at high temperatures, controlling the temperature also helps control the formation of harmful NOx gases.

Contrary to popular belief, a well-functioning EGR system increases the efficiency of gasoline engines.

FUNCTION OF EGR (Exhaust Gas Recirculation)

1. Function:

The EGR system returns some of the exhaust gases to the engine's intake manifold. This reduces the amount of oxygen in the combustion chamber, lowering the combustion temperature. Lower combustion temperatures reduce NOx formation because NOx emissions occur more at higher temperatures.

2. Working Principle:

Recirculation of Exhaust Gases: The EGR valve redirects some of the exhaust gases to the intake manifold. These gases mix with clean air and return to the combustion chamber.
Reducing Combustion Temperature: Returning exhaust gases slow down the combustion process in the combustion chamber and lower the temperature.
Reducing NOx Emissions: Lower combustion temperatures significantly reduce NOx emissions.

COMPONENTS OF EGR (Exhaust Gas Recirculation)

Exhaust gas recirculation valve.
Exhaust gas recirculation valve sensor.
Exhaust gas recirculation cooling block.
Exhaust gas recirculation temp and pressure sensors.

PROBLEMS OF EGR (Exhaust Gas Recirculation)

Limp mode problem.
Malfunction light coming on (Check Engine Light)
Black smoke seen in the exhaust.
Increase in Fuel Consumption
Erratic Idle

ADBLUE (Diesel Exhaust Fluid)

AdBlue is a fluid used to reduce emissions in diesel engines. Also commonly known as "Diesel Exhaust Fluid" (DEF). AdBlue is used in SCR (Selective Catalytic Reduction) systems to reduce nitrogen oxide (NOx) emissions in modern diesel engines.

FUNCTION OF ADBLUE (Diesel Exhaust Fluid)

1. Function:

AdBlue is a solution of urea and pure water injected into the exhaust system of diesel engines, converting harmful NOx emissions in exhaust gases into harmless nitrogen and water vapor.

2. Working Principle:

SCR System: AdBlue solution is injected into the exhaust system while the exhaust gases of the diesel engine pass through the SCR catalyst.
Chemical Reaction: AdBlue turns into ammonia (NH3) at high temperatures. This ammonia reacts with NOx in the SCR catalyst and turns into harmless nitrogen (N2) and water vapor (H2O).
Emission Reduction: This process significantly reduces NOx emissions, minimizing harmful gases released into the environment.