Brochure - ABA Gas

Outlook into the future
The development of gas engines for TEDOM buses continues.
TEDOM focuses especially
on the development
and production of gas
engines which it uses
for its own cogeneration
units and for municipal
and prepared intercity
buses. We asked Jiří Piller,
Designer of the TEDOM
engines, to describe
the latest news on the
development workplaces
and in the engine testing
room.
In the design for the automotive industry the
company offered in the past a version of the
CNG engine with a simple method of control
and mixing. On the basis of the continually
increasing requirements relating to the decrease
in emission limits, a decision was made about
the development of the new design of the
CNG engine with a full engine management
system, because only an engine controlled
this way is capable of mastering not only the
requirements on emission limit reduction, but
also the requirements concerning the engine
control within the entire operating range. The
development of this engine (marked as TG 210
AH TA 04) started in autumn 2003. And already
at the beginning of June 2004, the engine
was successfully certified from the viewpoint
of emissions according to the limits “EURO 4”.
At the same time the first bus into which this
engine was incorporated was completed. After
driving tests and approval, the bus was put into
operation at the beginning of 2005.
In the years 2005 and 2006, the main part of
the development of the engine in the vehicle
was taking place, which meant especially the
knowing of an operation reliability from the
viewpoint of the components used, both for
the gas installation of the engine and the parts
of the engine management.
The result of the development in this period is
given by certain structural changes in favour of
Bus
the company and functionality. The area of the
control of the engine management underwent
some modification especially in the form of a
change in software and communication with
control elements of the vehicle. Together with
the development in the vehicle there continued
various work in the engine testing room, in
particular the verification of the change in the
components designed, as well as preparatory
work on the new version of the engine.
At the beginning of 2007, there were
commenced the tests of the version of the
engine for the compliance with the future
limits EURO 5 and EEV. Successful fulfilment of
these requirements represents certain design
changes and changes in the method of engine
control. This version of the engine presupposes
two capacity levels, 210 and 245 kW. The tests
focused on verification of the changes in the
components designed continues.
The core point of the work consisting in the tests
of the engine in the vehicle was transferred into
the tests whose aim is to reduce the operation
consumption of fuel. These tests will serve as
a basis for the treatments and settings of the
driving regimes of the vehicle, both in the
control unit of the gearbox and in the control
unit of the engine. The reliability and function
tests will continue.
9.