New 1.9 CDTI with diesel particulate filters for the Vectra and Signum

Opel is on a good way of dealing with failures of the past when it
comes to diesel engines. Moreover, the new 1.9 CDTI Ecotec
four-cylinder engines for the Vectra and the Signum model family
demonstrates the efforts GM's German subsidiary, to be among the
leading diesel engine manufacturers in Europe. Variable multiple
injection of the second generation, variable turbine geometry and a
standard-, maintenance-free diesel particulate filter (DPF) to bring
Opel's new common-rail turbo diesel engines now on the top of the
European competition.

The new 1.9-liter CDTI engines in the Vectra and Signum models are
available in wattages of 88 and 110 kW and also meet the Euro 4
emissions standard. They develop their maximum torque 2000-2750 1/min.
In the 88-kW version of the engine provides up to 280 Newton meters
available, the 110-kW peak model, the maximum torque of 315 Newton
meters. The acceleration from a standstill to 100 km / h takes less
than ten seconds, top speed is 217 km / h. With two motors which is a
newly developed six-speed manual transmission, which was specifically
tailored to the engine characteristics, the power transfer.

The layout of the two 1.9-liter diesel engine is almost identical:
four cylinder, 1910 cm3 displacement, a turbocharger with variable
turbine geometry and intercooler. The most striking difference have
the cylinder heads: During the 88-kW unit has two valves per cylinder,
the 110-kW version equipped with four-valve technology. The so-called
E-Gas, with the two step on the accelerator electronically to the
injection system and gives a more spontaneous response. The Common
Rail system operates at up to 1600 bar injection pressure. Here, a
variable multiple injection reduced before each work cycle fuel
consumption, pollutant emissions and engine noise.

The maintenance-free diesel particulate filter system (DPF) of Opel,
with these engines is celebrating premiere waived entirely on fuel
additives. With the help of a new regeneration process had succeeded
the Opel engineers, fuel consumption, CO2 emissions and performance on
the same level as in the operation to maintain without a filter.
Before making a close-coupled and one underfloor catalytic converter
in combination for effective cleaning of the exhaust.

The new diesel particulate filter consists of a honeycomb-shaped
ceramic solid-state silicon carbide, which is crisscrossed by tiny
channels. The exhaust gas stream passes through the channel walls,
collect on the surface of the carbon black particles. The deposited
particles are burned regularly targeted by multiple injections. These
bring the temperature of the engine exhaust to the combustion process
in the filter for the required ignition temperature of 600 degrees
Celsius. The multi-injection system Injection of the 1.9 CDTI ECOTEC
unit Opel, according to this is in any engine load range, the
necessary flexibility. Therefore, the system does not work only under
full load, but also in the "cold" optimal. Regeneration occurs through
controlled pressure and temperature sensors in the environment of the
DPF unit in discontinuous intervals - ie only if the filter back
pressure created by deposits.