INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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Status Siemens AG

Dr. Michael Höge

25-26 Mai 2009

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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Function and system concept of the Generation 1 injector

two piezoelectric actuator

guiding cylinder

piston (1)

hydraulic chamber (1)

hydraulic chamber (2)piston (2)

needle

Advantage:high and robust needle lift

Disadvantage:production costsabrasion @ needle

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

INGAS INtegrated GAS PowertrainINGAS INtegrated GAS Powertrain

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Function and system concept of the Generation 2 injector

one piezoelectric actuator

guiding cylinder

piston (1)

hydraulic chamber (1)

hydraulic chamber (2)piston (2)

needle

Advantage:less production costshigher durability due to less abrasion @ needle

Disadvantage:needle lift is more sensibleagainst rail and combustion chamber pressure

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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Comparison of Gen1 to Gen2 injector

Gen2 injector

Gen1 injector

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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- 12 stroke amplifier with 3 different diameters of piston (5)

and

- 3 stroke amplifier with notches to reduce shear stresses

Best configuration will be used for Generation 2

Different configurations of Generation 2 injectors

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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Development of an optimized nozzle layout

Gen 1 ‘slotted’ needle Gen 2 ‘hollow’ needle

Larger guiding surface => less stresses => higher durability

A Gen1 top = 16mm² A Gen2 top = 60mm²

A Gen1 bottom = 50mm² A Gen2 bottom = 190mm²

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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Calculation of gas flow

Target is 10g/s

Calculation of theoretic gas flow @ CT

Politecnico di Torino: quantity and diameter of bores / exact quantity of gasflow

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Comparison of the simulated (PT) and theoretically calculated mass flow rate

Actual Status @ Siemens CT

Boundary conditions @ PT:

INGAS meeting, Prague, 25-26 Mai 2009INGAS meeting, Prague, 25-26 Mai 2009

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Calculation of the simulated and theoretically calculated mass flow rate

Actual Status @ Siemens CT

TemperatureFEM => 30°C

PressureFEM => 17bar

=> 272um needle lift ~ 10 g/s

Next step => measurement of gas flow @ CT* FEM Results from Politecnico de Torino

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Planning for next time @ Siemens CT

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Siemens CT

Dr. Michael HögeSiemens AGCorporate Research and TechnologiesPower & Sensor Systems / Actuators & ControlOtto-Hahn-Ring 6D-81730 Munich

Thank you for your attention!