Dedicated
gas engines can be developed from varying diesel engine
types that have gone through an application engineering
programme. Engine components need to be redesigned and
this included the cylinder head and pistons plus engine
control tables and settings need to be generated for
that engine type during dynamometer engine testing.
Exhaust catalysts may be required to allow the engine
to emissions requirements. The prototype engine will
be ready for endurance and road testing when this work
is completed.
The accompanying schematic
drawing is typical of the dedicated gas engine kit design.
The modules include:
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Ignition
module – the diesel injection system is replaced
by an ignition system, electronic distributor and
spark plugs and leads. |
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Gas module – takes the high pressure
gas from the storage cylinders and delivers it at
a constant pressure to the gas valve and then injects
the gas into the inlet manifold of the engine. The
storage cylinder pressure is monitored and a solenoid
valve is fitted for safety.
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Throttle
module – maintains the speed and load control.
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Sensor module – indicates the drivers demand,
engine speed, coolant temperature and inlet manifold
air temperature and pressure. |
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Driver interface module – to communicate
with the driver including a gas storage pressure
readout, LED lights to indicate faults and an RS232
computer communication port. |
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Controller module – includes the Controller
module and wiring loom. |
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Storage module – includes fill valve
and storage cylinders and pipe work that is installed
on the vehicle but this not normally the responsibility
of DieselGas. |
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Mechanical
hardware – the cylinder head will require
modification or replacement, new pistons manufactured
and distributor drive components designed and made.
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The total of these components plus the tables and settings
developed during the application engineering dynamometer
tests will allow engines of the same type to be converted
to dedicated gas.
This work is usually undertaken
by or in conjunction with the engine manufacturer.
A kit made up of all of the engine modules (not including
cylinders and fill valve)
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