Bosch 2008 User Manual download pdf (Page 15)

2008 | 2009 Bosch Automotive Aftermarket

Gasoline injection systems | A 13

Motronic – gasoline direct injection

Engines with gasoline direct injection form

the air/fuel mixture directly in the combus-

tion chamber. Only fresh air ﬂows through

the open intake valve on the induction

stroke. Special injectors inject the fuel

directly into the combustion chamber at

high pressure. Exact metering, condition-

ing and distribution of the air and fuel for

each individual combustion stroke permit

economical fuel consumption and a low

level of emissions. With its torque-based

electronic control function, the DI-Motronic

from Bosch sets new standards in the ﬁeld

of gasoline direct injection. The intelligent

system adapts all the relevant quantities to

the corresponding driving situation with a

high degree of accuracy. In part-load mode

it generates a lean stratiﬁed air/fuel mixture

and at full load a homogeneous mixture.

Operation: With gasoline direct injection,

the high-pressure pump supplies the

high-pressure circuit with fuel at the high

pressure required for the fuel rail. The high-

pressure injector attached to the fuel rail

very quickly meters and atomizes the fuel

at high pressure, thus ensuring the best-

possible formation of the air/fuel mixture

directly in the combustion chamber.

 Air-mass meter with temperature sensor

 Carbon canister

 Canister-purge valve

 High-pressure pump

 Pressure-control valve

 Fuel rail

 Ignition coil

 Accelerator-pedal module

 Throttle device (ETC)

N EGR valve

O Intake-manifold pressure sensor

Q High-pressure sensor

M High-pressure injector

K Knock sensor

, Engine-temperature sensor

- Lambda sensor (LSU)

I Lambda sensor (LSF)

H NO

x

Catalytic converter

J Electronic control unit

N Diagnosis interface

O Diagnosis lamp

Q Immobilizer

M CAN

K Delivery module with presupply pump

, Speed sensor

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