SsangYong Actyon Sports II. Manual — part 33

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1914-01

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1914-01

1. SYSTEM DESCRIPTION OF E-VGT
(Electric-Variable Geometry Turbine)

The E-VGT turbocharger has one shaft where at each ends are installed with two turbines having

different angles to connect one end of housing to the intake manifold and the other end to the exhaust

manifold. As the turbine, at exhaust end, is rotated by exhaust gas pressure the impeller, at intake end,

gets rotated to send air around center of the impeller, being circumferentially accelerated by the

centrifugal force, into the diffuser. The air, which has been introduced to the diffuser having a passage

with big surface, transforms its speed energy into the pressure energy while being supplied to the

cylinder improving the volume efficiency. Also, the exhaust efficiency improves as the exhaust turbine

rotates. The turbocharger is often referred to as the exhaust turbine turbocharger.

1) Overview

Diffuser: With the meaning of spreading out it is a device that transforms fluid's speed energy into the

pressure energy by enlarging the fluid's passage to slow down the flow.

The E-VGT system installed to the D20DTR engine variably controls the passages of the turbine

housing to regulate the flow rate of the exhaust gas. The actuator of E-VGT is a DC motor actuator (E-

Actuator) which controls more quickly and precisely than the previous vacuum type actuator.

The engine ECU controls the E-Actuator electronically as follows:

At low speed: Narrows the flow passage for the exhaust gas, resulting in increasing the flow

speed of the exhaust gas and running the turbine quickly and powerfully.

At high speed: Expands the flow passage for the exhaust gas, resulting in increasing the mass

flow of the exhaust gas and running the turbine more powerfully.

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Maximizes the intake air charging efficiency (Approx. 15%)

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Optimizes the exhaust gas flow rate by controlling the vanes inside the turbine housing with the E-

Actuator.

1.

(2) E-VGT Actuator (Electric-Actuator)

Target temperature and airflow control

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Enhanced emmission control: By temperature control with CDPF system

1.

(1) Performance (for EURO V)

Has a faster response time than the conventional vacuum actuator.

2.

Improved low speed torque, high speed power and fuel economy.

Improved acceleration performance with rapid response time of vane.

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2) Features

Features

Benefits

Folding and unfolding of the vane

is controlled electrically

Easy to get low speed air volume

Rapid response time

Electric control

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Improved low speed torque and

power

Reduced exhaust gas

Improved fuel consumption

Improved acceleration

performance

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