Bosch 2008 User Manual download pdf (Page 44)

A42 | Gasoline injection components

Bosch Automotive Aftermarket 2008 | 2009

Pulse valves

System:

K-Jetronic (with Lambda control)

Purpose:

The pulse valve is installed in the connecting line between the fuel distributor’s lower chambers

and the fuel return. It is actuated by the Lambda controller and opened and closed in a deﬁned

cycle. This enables the pressure in the lower chambers to be varied and the air/fuel mixture

regulated to λ = 1.

Part number:

0 280 150 300 – 0 280 150 349

Secondary-air pump (electrical)

System:

Motronic

Purpose:

Use is made of the electric secondary-air pump to comply with the stringent emission legislation

in the post-start phase. Fresh air injected directly downstream of the combustion chamber

causes afterburning of the hot exhaust gases and ensures more rapid warm-up of the catalytic

converter.

Part number:

0 580 000 ...

Shutoff valve

System:

Motronic

Purpose:

The shutoff valve is used in turbo engines to protect the turbocharger. The turbocharger

remains in operation on switching from turbo to overrun mode. Without a shutoff valve, the air

would impact against the closed throttle valve and ﬂow back into the turbocharger. This return

ﬂow of air could damage the turbocharger. To guard against this, the seat of the shutoff valve

is opened by the vacuum applied in the intake manifold in overrun mode with the throttle valve

closed. This enables the air conveyed by the continued operation of the turbocharger to be

routed via a bypass around the turbocharger and back into the intake manifold.

Part number:

0 280 142 100 – 0 280 142 150

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 74 75

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Bosch 2008 User Manual Page 44