Holset turbocharger after a long high-speed operation, can not turn off immediately. When the engine work, some of the oil supply turbocharger rotor bearings for lubrication and cooling. Shock Absorbers After running the engine suddenly stopped, the oil pressure to drop rapidly to zero, the high temperature reached turbocharger middle part of the heat bearing housing can not be taken away quickly , and high-speed rotation inertia turbocharger rotor while still Therefore, if the engine is hot state a sudden stop , causing retention turbocharger oil overheating and damage to the bearing and shaft. (Auto Performance Parts)Particularly to prevent sudden flameout Meng kicks after the throttle. When the fuel injection system failure, burning low-grade fuel oil, the fuel increase, high exhaust temperatures. Whether it is full load or part load, regardless of how serious afterburners, which are in the normal operating point tie with running line. With the burning end delay, exhaust temperature , turbocharger speed increases , the compressor flow increases, the pressure ratio increases, the operating point to the curve with high mobile , less surge margin.( isuzu turbo)
One direct consequence of the pressurization system flow obstruction factors turbocharger flow obstruction is increased resistance to airflow in the system. Engine running, the gas flow path pressurization system are: the compressor inlet filter and silencer → → Compressor compressor impeller diffuser air cooler → → → Diesel tank scavenging air inlet ( valve ) → exhaust port ( valve ) → exhaust → Holset turbocharger nozzle ring → → chimney exhaust turbine wheel . Wherein the flow area of the components are fixed. If any of the above flow route links clogging, such as dirt, carbon knot, deformation, etc., will make the compressor due to increased flow resistance back pressure, flow reduction caused by the surge. Which is easy to dirty parts are the compressor inlet filter, compressor impeller and diffuser, air coolers, engine intake (sweep) air intake and exhaust ports (valves) , gas turbine nozzle ring , gas turbine impeller. Typically, the gas flow passages blocking turbocharger which is the main cause of the surge.( isuzu turbocharger)