Operation principle, lean-burn gas engine
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1.01
, Gas
0211 BC
An air flap for each cylinder restricts the air supply
during start-up and low load operation.
As the pressure in the cylinder is low, gas is
admitted into the small pre-chambers - one in each
cylinder head, electronically controlled by the pre-
chamber pressure unit. During compression, the
lean charge in the cylinder is partially pushed into
the pre-chamber, where it mixes with the pure gas
to form a rich mixture that is easily ignited by the
spark plug. This powerful ignition energy from the
pre-chamber ensures fast and complete combustion
of the main charge in the cylinder.
Advanced electronic engine management ensures
the operating parameters of the engine are
adjusted and optimised in relation to each other.
The system sets the optimum main, and pre-
chamber gas pressures, the AFR (air/fuel ratio), the
fuel rack position, the ignition timing and air throttle
position.
The alarm and monitoring part of the system
features many built-in safety functions. It combines
safe operation with high availability, protecting the
engine and signalling any fault. It includes a mis-
firing detection system based on analysing different
operational parameters and a knock
detection system. The system detects and eliminates
knocking individually for each cylinder.
The complete engine management, control and
monitoring system fits into a cabinet next to the
engine and communicates with the plant control
through one simple cable.
Operating principle, lean-burn gas engine
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