ENGINES
54 iVT International Off-Highway 2020
ABOVE: Nominal rated values of the Hatz 3H50TIC/4H50TICD – torque and power
FREE READER ENQUIRY SERVICE
To learn more about this advertiser, visit
www.magupdate.co.uk/pivt
compact design is one result of this technology.
Thanks to the engines’ enormous power and high
torque, machine manufacturers can use the Hatz
H-series in machines normally fitted with higher
displacement class systems. The turbocharged
three-cylinder 3H50TICD engine with
intercooler and 1.5-litre displacement is proof
that more than enough power is available. It
already reaches its high torque of 200Nm at 1700
rpm, which in many cases even exceeds the
torque of older 56kW engines. In addition, there
are H-series versions under 19kW, without an
intercooler, which already deliver a very high
torque of 130Nm at 1300rpm and as a result
encroach on the former 19-37kW class. This
means torque-intensive applications such as
hydraulic hoisting are no problem. In addition,
noise emissions have been slashed compared
to conventional engine solutions without
a turbocharger thanks to the low speed of the
Hatz engine.
Creating space and reducing weight
A special design challenge for Hatz was retaining
the H-series’ compact dimensions while
integrating additional indispensable components,
such as the diesel particulate filter (DPF). This
massively reduces the construction space
problems in machines for manufacturers due to
the conversion to Stage V. The DPF in particular
plays a decisive role in an engine’s space
requirements. Consisting of a cordierite DOC
(diesel oxidation catalysts) and silicon carbide
DPF, the DPF was placed at the front of the
engine contour and as a result only extends the
engine in the direction of the power take off
(PTO) above the flywheel housing. Furthermore,
the optional integration of a glow device in the
inlet housing to the DOC to raise the exhaust gas
temperature during the active regeneration
phase, combined with a more powerful 150
ampere alternator, was realized without
additional construction space requirements.
Another decisive factor was the development of
far more compact electronic components, which
are grouped in the plug-and-play solution of the
Hatz OPU (Open Power Unit) in the central
electric assembly.
Yet another important achievement of the
H-series’ design is the particulate filter concept.
It permits maximum flexibility with minimal
space requirements. The modular design
facilitates versatile, space-saving installation
with a wide range of exhaust outlets, engine or
chassis mounting and optional horizontal,
vertical or inclined placement.
An industry-wide innovation
DPF regeneration or the regeneration strategy
for the particulate filter system consists of
a complex interplay of technical necessities and
user-friendliness for the machine operator. Hatz
has adopted a completely new approach. The goal
was to maximize the range of use and reliability
in every conceivable installation scenario. Hatz
implemented novel thermal management via
demand-actuated adjustment of the exhaust gas
recirculation through the adjustment of the
throttle valve, late displacement of the
combustion and additional application of late to
very late - but still torque-generating injection,
with simultaneous realization of a very low lightoff
temperature on the DOC. In addition, with
optional additional heating at the the DOC inlet,
an increase in the exhaust gas temperature is
possible via the internal engine load boost and
external energy supply. This makes an individual
reaction to all load profiles possible. Moreover,
additional dosing of uncombusted fuel from split,
very late injection facilitates temperature control
during the active regeneration phase. Another
achievement is the automatic shut-down of one
(3H50TICD) or two (4H50TICD) cylinders
during standstill regeneration. This reduces the
exhaust gas flow, increasing the temperature level
during the temperature control phase. This is the
first use by Hatz of automatic cylinder shut-down
in industrial diesel engines in this power class.
Hatz Applicationizer at a glance
The design of the Hatz H-series engine platform
is distinguished by its durability, power, compact
size and great maintenance friendliness.
Innovations like the iHACS combustion
procedure ensure observance of the emission
thresholds. With an additional diesel particulate
filter, stricter limits, such as the EU Stage V
Regulation, can be observed, with identical
power characteristics and scarcely changed size.
This is all to the benefit of the machinery
manufacturer and operator. The range of three-
and four-cylinder models has been designed for
a wide variety of uses and provides a drive for
almost every scenario and market. iVT
Author: Dr.-Ing. Simon Thierfelder, Hatz, Germany
/pivt
