An HHO gas stream for use in an internal combustion engine is heated by heat exchange from with an exhaust gas stream from the internal combustion engine.

A method includes determining that at least one diesel emissions fluid (DEF) doser of an exhaust aftertreatment system is likely frozen based on at least one of an ambient air temperature or a DEF source temperature; operating an engine in a cylinder cutout mode in response to the determination that the at least one DEF doser is likely frozen; and, discontinuing the cylinder cutout mode in response to determining that the at least one DEF doser is in a predefined condition.

A dual-chamber electrolysis vessel safely stores HHO gas for use by an internal combustion engine.

Safety of vehicles employing an electrolysis generator is improved by a rollover abatement system.

HHO gas is introduced to a diesel particulate filter to improve combustion of a fuel to aid in regeneration.

A dual-chamber onboard electrolysis system is configured to produce HHO gas for heavy duty trucking applications.

An HHO gas stream for use in an internal combustion engine is heated by heat exchange from with an exhaust gas stream from the internal combustion engine.

Timing of HHO gas injection into a 4-stroke engine is optimized based on engine operating parameters to improve fuel economy.

Injection of HHO gas to plural injection points about an internal combustion engine is controlled based on combustion timing parameters.

HHO gas is distributed proximate combustion chambers of a diesel engine and to a diesel particulate filter regeneration system.