Bosch 2008 - Manual (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