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6.2 Adjustment of LPG/CNG direct injection in spontaneous combustion engines
Diesel engines are adapted to be fed with a lean mixture. To measure composition of very lean mixtures
occurring at low and medium loads, it is necessary to observe oxygen content (in %) in exhaust gas (the
"Measured value" should be set to "Oxygen" in controller settings, as described in section 5 of this
instruction).
Depending on engine model, oxygen content in exhaust gas varies typically between a dozen of
percents at low loads and several per cents at high engine loads.
If at certain engine load range, oxygen content in exhaust gas drops to around 0% (this is indicated by
intensive smoke from the exhaust because the smoke limit is exceeded), it means that gas direct injection
or its increase has not justified (increased gas injection will cause no increase in engine power and
decrease in diesel oil consumption).
If oxygen content in exhaust gas is too high (12% can assumed as a reasonable limit, but this value will
vary depending on engine design), injected gas will not be burnt completely and will escape from the
exhaust in the form of not burnt hydrocarbons. In such situation no direct gas injection is recommended.
7. Technical data
Supply voltage 12[V] -20% ÷ +30%
Maximum input current 2A
Operating temperature -40°C ÷ 70°C
Protection Class IP40
8. Warranty terms and conditions
Warranty does not cover the wideband oxygen sensor provided in the kit. This is a consumable component
subject to natural wear.
Warranty also does not cover:
damages resulting from improper use of the device,
damages resulting from not keeping the set operating conditions (e.g. installation at locations not
consistent with installation instructions or in locations exposed to water or high temperature; supply
from a source of voltage exceeding the allowable range)
mechanical damages,
systems modified or repaired without authorisation,
mechanically damaged systems on user's fault, in particular:
damages to connectors,
damages to connectors due to use of chemical cleaning agents,
damages to housing,
damages to PCB’s,
systems damaged electrically due to connection of communication interfaces incompatible with
installation instruction,
other damages on user's fault.
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