A Euro 6 Nissan 1.5 dCi engine (model K9K) was used in this study. This is a four-cylinder turbocharged, intercooled, direct-injection diesel engine, which is equipped with double EGR system, one low-pressure cooled EGR (LP-EGR) and another high-pressure non-cooled EGR (HP-EGR). In addition, the after-treatment system includes a diesel
Diesel high-pressure EGR valves divers high-flow exhaust gas with soot as it enters the diesel particulate filter. The gas is then transferred to the inlet manifold via a pipe or internal drillings. Diesel low-pressure EGR valves divert the harmful gas after passing through the particulate filter. However, it has a lower flow than high-pressure
Mechanical EGR valve position sensors are mounted on the top of the EGR valve. EGR pressure sensors will be located close to the EGR valve as the exhaust gas hose must be connected to the sensor as well as the valve. Will a malfunctioning EGR Position or Pressure Sensor illuminate the check engine light or affect vehicle operation?
The main challenge in this is to keep a track of exhaust gas mass and recirculate according to the requirements. Once all this is achieved, there are plenty of advantages to EGR including reduced fuel consumption, controlling of temperature and pressure inside the combustion chamber, reduction of harmful and toxic pollutants and a ton more.
One of the first symptoms of a possible problem with the EGR control solenoid is engine performance issues. If the EGR solenoid has any issues, it can cause the finely tuned air fuel ratio to be thrown off. This may result in a decreased power, acceleration, fuel economy, as well as an increase in emissions. 2. Engine pings or knocks.
Many diesel owners ask about the necessity of having an oil catch can – especially when most modern diesel engines are fitted with an Exhaust Gas Recirculation (EGR) system. These components have become a necessity in modern vehicles and aim to lower emissions outputs, as well as improve throttle response and provide greater engine longevity.
I understand the function of the egr in gas engines. On FId gassers EGR can be a good thing. EgR Gets you better fuel mileage/ cuts emissions. If you delete EGR on FId engines with out reprogramming the ECM or chip it can hurt Gas mileage. There is no real performance gain by deleting egr because it only works at cruise and part throttle. 1.
The valve does have some trouble with soot buildup however. Given that the use of any EGR in diesel engines creates a soot rich environment, we have to learn to mitigate the problems it causes.
The valve on the left is relatively clean because it is from a truck with a failed EGR cooler (the coolant from the blown EGR cooler removed the soot).
.
how egr works in diesel engine
