Insulation class H
Equipment class I
The TOTEM’s internal circuit size, flow rates, temperature deltas and circuit pressure
values have been carefully calculated and set upon design.
- Exhaust Treatment and Discharge Line
Exhaust gases from the endothermic engine are conveyed along the treatment and
cooling line before being expelled. The exhaust discharge line comprises a 4-1
manifold, a coaxial exchanger, a three-way catalyst, a tube bundle exchanger for
heat recovery and an in-built silencer.
The 4-1 manifold conveys exhaust gases from the 4 engine cylinders into the
exhaust duct. It is equipped with a lambda sensor for injected mass control as well
as with a sensor checking gas temperature right at the engine outlet.
The manifold is efficiently insulated so as to minimize heat dispersion along this
section. Gases then go through the coaxial heat exchanger where a first cooling
stage takes place, after which they are sent to the three-way catalyst where
emissions are lowered. The ceramic substrate catalyst simultaneously reduces CO,
NO
x
and HC emissions. It is fitted with a sensor at the inlet to check the right
operating temperature for the catalyst, plus a lambda sensor downstream for a
second level titration control. The catalyst is thermally insulated, too. The gases
leaving the catalyst reach the tube bundle exchanger where they are cooled down
until condensation occurs (T<70°C).
Before being discharged, gases go through an exhaust gas silencer, specifically
devised to lower the noise emissions from the micro-cogenerator for the given rev
number.
- Electrical and Control Switchboard
The Electrical Switchboard complies with current applicable standards and it contains
all the electrical safety devices as well as all control devices governing the unit’s
functioning.
The TOTEM is governed by 3 control units:
ECU (Engine Control Unit): manufactured by Magneti Marelli, it governs
control of the endothermic engine. The control unit is set to work under
steady state conditions and it interfaces through CANbus system with
the MCU. It is located inside the unit’s enclosure;
MCU (Machine Control Unit) “Arya”: developed to fit specific TOTEM
ENERGY requirements, it governs the control and operation of the
TOTEM® unit through an interface with the ECU via CANbus and with
the Gateway via Modbus protocol. Also, it is connected to a multi-
function multimeter that conforms to a 0.5s accuracy class in
compliance with IEC 62053-22 standards. It is located inside the unit’s
enclosure.
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