US Patent 8117999 Electrolyte delivery system and method

In a system for providing electrolyte to an electrolysis cell for producing hydrogen gas to inject into the intake of an internal combustion engine, a water store is in communication with a water supply line, for replenishing the level of electrolyte solution used by the electrolysis cell. A valve which may be disposed at a level below the level of the water supply line and is opened, for example upon deactivation of the engine, to drain the water out of the water supply line and prevent freezing in sub-freezing temperatures.