so hydrolysis occurs inside the component. The first SCR unit is fitted downstream, still close to the engine.
The close-coupled design of these
compact metal components ensures
rapid heating for catalyst light-off and is
highly effective for engine cycle conditions commonly found in nonroad applications, Emitec said.
NOx emissions are already substantially reduced in the first SCR stage. In
combination with a second SCR unit, the
system can achieve NOx conversion
rates up to 90 to 95%.
With these NOx conversion rates, NOx
engine-out emissions can exceed 5 to
6 g/k Wh and still meet the requirements
of EU Stage 4, Emitec said. This is intended to allow a larger degree of freedom in the design and tuning of the engine for further improved fuel efficiency.
Emitec said that modern engines with
high-pressure fuel injection and highly
effective turbocharging will require no
other emissions control technology than
its SCRa system to achieve EU Stage
3b or even Stage 4.
SEE DIRECTLINK
WWW.DIESELPROGRESS.COM
Engine Control Systems
Europe AB
Engine Control Systems Europe AB
(ECS) has launched its Actifilter DB, a
particulate filter system and silencer,
which regenerates with a diesel burner.
There are no duty cycles or exhaust
temperature requirements for this system, and fuel consumption is low due to
a short regeneration time of 5 to 15 minutes when the vehicle is idling.
The Actifilter DB particulate filter part
is the same as is used in the company’s
Unikat Combifilter, which reduces PM
up to 99%.
SEE DIRECTLINK
WWW.DIESELPROGRESS.COM
Heinzmann GmbH & Co. KG
The latest development at Heinzmann
is the Apollon range of throttle-valve-controlled EGR-TV valves operated by
high-performance actuators. The control
electronics allow the size of the opening
to be calculated precisely without the
need for a position sensor.
The Apollon range of throttle valve-controlled EGR-TV valves from
Heinzmann.
The throttle valve in the low range
benefits from the higher resolution of
the flow rate and the metering accuracy. The high holding force provided by
the actuator means the valve is not sensitive to pulsations in the exhaust,
Heinzmann said.
The EGR-TV valve has higher dynamic
response due to its faster opening, which
maximizes the exhaust gas recirculation
rate. Conversely, rapid closing of the valve
prevents unwanted soot blow-off during
transitions to low load on the engine.
The functional unit formed by the throttle
valve and the stepper motor can be customized according to the intended application. The two components can be mounted
separately or as a combined unit.
Heinzmann said it developed the
EGR-TV valve with a more robust design
to decrease the sensitivity to contaminants, making it ideal for deployment in
the harsh environment of a diesel engine
exhaust system. The compact design
and flexible installation options allow the
valve to be used universally in a variety of
engine applications.
SEE DIRECTLINK
WWW.DIESELPROGRESS.COM
HJS Fahrzeugtechnik GmbH &
Co. KG
HJS has developed an aftertreatment system for critical applications of
particulate filter systems or NOx
reduction systems in regards to the operating
temperature of the exhaust gas.
To ensure regeneration or dosing during
engine operation, HJS has developed a
burner technology resulting in a new
degree of freedom for thermal manage-
ment of aftertreatment technologies. Be-
sides being an OE component in after-
treatment systems engineered by engine
manufacturers, this component enables
HJS to upgrade existing Tier 3 or Stage 3a
engines to Tier 3b or Stage 3b engines.
With this component, thermal manage-
ment can be controlled by independent
aftertreatment with full OE capabilities,
such as an onboard diagnosis (OBD).
Hug Filtersystems AG, a subsidiary of
the advanced technology company Hug
Engineering AG located in Switzerland
has launched an “all-in-one” filter to the
market after several years of research
and development.
Mobiclean R Advanced, the round
filter for engines from 15 to 650 k W, is
designed to reduce particulate matter
by 99.9%. Additionally, a specialized
catalyst reduces CO and HC output.
The Mobiclean R advanced is a
closed filter system with passive regeneration, which functions at exhaust temperatures from 170°C through the catalytic coating of silicium carbide.
VERT certification proves the effectiveness of the filter even after extended
usage. Hug Filtersystems explained, for
instance, that the engine testing department of MAN in Nuremburg, Germany,
