Back to search. Information on the product. In simplified terms: Heating a certain volume of gas causes it to expand; the volume decreases as the gas cools down. If the volume is restricted, as is the case for example in a cylinder, the pressure increases with increasing temperature and drops on cooling. Product group : Emission control. This might also interest you. Information on the product Troubleshooting in exhaust gas recirculation system on Otto and diesel engines Basic information What is exhaust gas recirculation?
Information on diagnostics Troubleshooting in exhaust gas recirculation system on Otto and diesel engines 2 Tips for troubleshooting Irregular idling? Information on diagnostics OBD-System OBD and exhaust gas return system The on-board diagnostics shows a fault in the exhaust gas recirculation system, but what does the displayed diagnostic trouble code mean?
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Draw conclusions regarding you as a person except where you have explicitly entered your details, e. Convenience These cookies make the website easier to use and save settings, for example, so that you do not have to repeat them every time you visit the site. Remove the EGR valve. Does the EGR valve look wet, gummed up, or steam cleaned.
This may be a result of an EGR cooler problem. Tips from the Auto Shop. Having Trouble Locating a Part? This Weeks Hot Buy. Diesel Pro. However, instead of a pump, many of these systems ended up using a hybrid configuration such as that illustrated in Figure 4 for the 2. High pressure EGR is supplied to all 6 cylinders from only 3 of the cylinders. The fixed geometry turbocharger turbine is a twin scroll design but the scroll for the cylinder supplying EGR is smaller in cross-sectional area to enable a higher back pressure to be generated by these cylinders and ensuring adequate EGR flow over a wider range of operating conditions than would be possible with a fixed geometry turbine having equal scroll sizes.
This approach avoids to need to use a variable geometry turbine. The other larger scroll can be optimized for scavenging of the other three cylinders []. For low-speed two-stroke marine engines designed to burn heavy-fuel oil HFO , the EGR system can become quite complex owing to the need to clean the recirculated exhaust gas of harmful metals and sulfur and the need to maintain the exhaust header pressure below that of the intake header to ensure cylinder scavenging.
Figure 6 illustrates one such system designed for a retrofit application []. The main components are: scrubber, cooler, water mist catcher, blower, shut-down valve, change-over valve, water treatment plant WTP consisting primarily of the buffer tank, NaOH dosing system and water cleaning unit.
A control system controls the amount of EGR, the scavenge air pressure, the NaOH dosing, scrubber water circulation and scrubber water discharge. Scrubbing can be carried out with sea water or fresh water.
In sea water scrubbing, intended as the main operating mode, sea water is passed through the scrubber once and dumped into the sea. As fresh water flows through the scrubber it becomes acidic from the sulfur in the exhaust gas. You can also change your cookie settings for this website at any time. We place great importance on transparent information relating to all aspects of data protection.
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