How Geometric Turbocharger Works?

How Geometric Turbocharger Works?

 

How Geometric Turbo charger Works?

Model: Hyundai Engine

2011  D 2.0 CRDI  Engine  Engine Control  P0234 Turbocharger/Supercharger Overboost Condition

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Study Guide and Component Location Study Guide and General Description Study VGT(Variable Geometric Turbocharger) is the device which increases the efficiency of turbocharger at low rpm and lasts optimum turbo efficiency at high rpm as varying the cross sectional area through which exhaust gas passes turbocharger impeller. It relieves turbo lag at low speed and increse engine power generation. Study Engine speed, APS signal, MAFS and Boost pressure sensor data are inputted to ECM. Study ECM actuates vacuum diafragm which controls exhaust gas line as controlling VGT actuator duty to maintain optimum state of air compression. Study Guide and DTC Description Study P0234 is set when real boost pressure is much lower than target boost pressure for more than 15 sec. at above 1750RPM and 10~22mg/hub of fuel injection quantity. Study This code is due to poor connection of VGT solenoid valve vacuum hose, vacuum leakage, clogging, VGT turbo charger component failure. Study Guide and DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Signal monitoring • VGT solenoid component • VGT vacuum line • VGT turbo charger component Study Enable Conditions • Engine running (at above 1750RPM and 10~22mg/hub of fuel injection quantity) Study Threshold Value • Real boost press. is much lower than target boost press. Study Diagnostic Time • 15 sec. Study Fail Safe Fuel cut NO • - EGR Off YES Fuel Limit YES Check Lamp ON Specification VGT Actuator Component Resistance VGT Actuator Operating Hz VGT Actuator Operating Duty 14.7 ~ 16.1Ω (20°C) 300Hz 76% at idle, decreases as accelerating Signal Waveform & Data Fig.1) VGT actuator output waveform at 79% duty( (-)duty ). Duty decreases as boost pressure increases. Fig.2) VGT actuator duty( (-)duty ) decreases as accelerating.