Bi-fuel control system and retrofit assembly for diesel engines

A digital bi-fuel control assembly structured to modify a diesel engine so as to achieve operation thereof in either a full diesel fuel mode or a bi-fuel mode at comparable operating efficiencies, said control assembly comprising:

• a) a gas control sub-assembly structured to control the amount of gas supplied to the diesel engine during operation in said bi-fuel mode,
• b) an electronic control sub-assembly structured to at least partially regulate operation of said gas control sub-assembly,
• c) said gas control sub-assembly and said electronic control sub-assembly being cooperatively structured to provide both automatic and manual transfer of operation of the diesel engine between said full diesel fuel mode and said bi-fuel mode without disruption of engine output, and
• d) said gas control sub-assembly further structured to operate independently from a governor of the diesel engine, and to determine the amount of gas to be supplied to the diesel engine in response to a load requirement of the diesel engine.

A digital bi-fuel control assembly structured to modify a diesel engine so as to be operable in either a bi-fuel mode or a full diesel fuel mode at comparable operating efficiencies, said control assembly comprising:

• a) a gas control sub-assembly structured to control the amount of gas supplied to a diesel engine during operation in said bi-fuel mode,
• b) an electronic control sub-assembly structured to at least partially regulate operation of said gas control sub-assembly,
• c) said gas control sub-assembly and said electronic control sub-assembly being cooperatively structured to provide both automatic and manual transfer of operation of the engine between said full diesel fuel mode and said bi-fuel mode without disruption of output, and
• d) said electronic control sub-assembly further including an engine intake manifold air pressure sensor disposed in operative proximity with the diesel engine intake manifold and structured to measure an engine intake manifold air pressure which is utilized to determine a required gas flow rate.

A digital bi-fuel control system for modifying diesel engines so as to be operated either in a full diesel fuel mode or a bi-fuel mode, at substantially equivalent operating efficiencies, said control system comprising:

• a) a gas control sub-system structured to control the amount of gas supplied to the diesel engine while being operated in the bi-fuel mode,
• b) an electronic control sub-system structured to regulate operation of pre-determined components of said gas control sub-system,
• c) said gas control sub-system and said electronic control sub-system being cooperatively structured to provide both automatic and manual changes of operation of the diesel engine between the full diesel fuel mode and the bi-fuel mode without disruption of output, and
• d) said electronic control sub-assembly further including an engine intake manifold air pressure sensor disposed in operative proximity the diesel engine intake manifold and structured to measure an engine intake manifold air pressure, said electronic control sub-assembly structured to utilize said measured engine intake manifold air pressure to determine a required gas flow rate.