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More CNG tech

by David Zatz on

More compressed natural gas (CNG) engines may be on their way — or Ram may be upgrading their current CNG engine, if a recently granted patent is any indication.


FCA US’ Louai Faied and Bryan Axe filed for the patent, which involves having a computer decide whether the temperature is low enough that injectors may “freeze up.” If so, the system uses a heater to heat up the tank and injector in such a way that both are ready for use at the same time, making it possible to switch from gasoline to CNG more quickly. Ram’s current CNG pickups are dual-tank setups, with gasoline used either when the CNG tank is empty or when it is too cold to use compressed natural gas (essentially, when it is below freezing).

The system prevents the injectors from freezing up while in use, as well as from having the engine attempt to switch to CNG while the tank or injector is too cold from not being used. See patent #9,188,043. 

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