Bosch 2008 User Manual download pdf (Page 37)

Gasoline injection components | A35

2008 | 2009 Bosch Automotive Aftermarket

Fuel rail

Systems:

L, LH-Jetronic, Motronic

Purpose:

Along with the electric fuel pump, fuel ﬁlter, injectors and pressure regulator, the fuel rail forms

part of the fuel-supply system which always supplies the engine with the necessary amount

of fuel under all operating conditions. The pressure generated by the fuel pump is applied to

all injectors by way of the fuel rail. The unused fuel ﬂows back to the fuel tank via a pressure

regulator. In most cases, the pressure regulator (fuel rail – conventional design with pressure

regulator) uses the intake-manifold pressure as a reference. The use of this typical pressure

and the ﬂow through the fuel rail (fuel cooling) prevent the formation of any unwanted vapor

bubbles in the fuel.

Part number:

0 280 151 ..., 0 280 152 ...

High-pressure injector HDEV-1 + HDEV-5

Purpose:

The high-pressure injector (HDEV), one of the key components of a gasoline direct-injection

system, is linked by way of hydraulic connections to the fuel rail (KVS-HD) and is actuated via a

current-controlled output stage. The solenoid swirl valve injects a precisely metered quantity of

fuel with a deﬁned spray pattern directly into the combustion chamber in ﬁnely atomized form.

The injected fuel quantity is determined by pressure, ﬂow rate and the actuation time of the

injector. The spray geometry is matched to the requirements of the corresponding engine and

the combustion process.

Part number:

0 261 500 ...

High-pressure injector HDEV-4

System:

Motronic gasoline direct injection

Purpose:

The HDEV-4 is a high-speed piezo injector for gasoline with variable needle lift. The nozzle

opens outwards and ensures outstanding spray stability whilst at the same time being

extremely resistant to coking. The injector covers a wide metering range in which the quantity

characteristic curve is distinguished by a high degree of linearity.

The HDEV-4 can be employed for various combustion methods and injection concepts. Its rapid

and accurate multiple injection action opens up new potential for conﬁguring the injection

process.

Part number:

0 261 500 ...

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 74 75

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Bosch 2008 User Manual Page 37