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Wednesday, December 29, 2010

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

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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.

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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

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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.

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