User Manual

Chapter 4
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
27
VII - SWIRL CONTROL ELECTROVALVE (1264)
A - ROLE
The Swirl control electrovalve controls the Swirl control diaphragm.
B - DESCRIPTION
The control electrovalve connects the vacuum pump and the Swirl control
diaphragm.
SDI010C
h
l
j k
h - Vacuum inlet from the vacuum reserve
j - Atmospheric pressure inlet
k - Electrical connector
l - "Usage" outlet
The electrovalve is controlled with an OCR (Open Cycle Ratio) and using a
cartographic map (injection ECU).
The electrovalve is subject to the following:
• atmospheric pressure,
• vacuum supplied by the vacuum pump.
The pressure supplied by the electrovalve is between atmospheric pressure and
the vacuum from the vacuum pump.
Warning: The "Swirl" control throttle is closed when it is not controlled
pneumatically.
Conditions allowing the throttle to open:
• engine speed above 2100 rpm (at 80°C) (2500 rpm at 0°C),
• injected fuel flow greater than 40 mg/stroke.
cardiagn.com