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ELECTRICAL
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Auxiliary combustion control device
The air fuel mixture self-ignition points are mainly
influenced by two factors: pressure & temperature
inside the combustion chamber. The temperature
control in all those condition in which the
combustion chamber is relatively “cold” (i.e. during
cut-off or during post-start) may improve the
reduction of ignition delay with large benefit in
terms of emission & combustion efficiency.
Auxiliary Power Management device
The total power dissipation of glow plug is not
negligible (it may vary from 240W to 750W
according with glow plug characteristics). In some
cases, it may be useful to increase the engine
load operating point in order to achieve higher
exhaust temperature (e.g. in order to start the
regeneration of diesel particulate filter). The glow
plug activation in this condition may help either
directly, increasing combustion temperature
indirectly increasing engine load as required.
The features of modern Glow plug Interface unit
must allow the EMS to operate in all of above
conditions with possibility to choose the driving
method & parameter optimization.
Command & feedback Signal Description
Command signal
The glow plugs are supplied by control unit with
battery voltage (12V). The glow plug temperature
is controlled by ECU through a function stored
in memory, which links glow plug temperature with
the duration of heat signal (12V).
Feedback Signal
Feedback signal given by glow plug controller to
EMS ECU. Glow plug informs the EMS ECU
whether the command given by ECU is followed.
Circuit Diagram