A hydrogen discharge control system controls a hydrogen discharge flow rate in a hydrogen engine vehicle that discharges hydrogen from a hydrogen tank in which a resin liner is laminated on an inner wall, to a hydrogen engine, in accordance with an accelerator operation amount. The hydrogen discharge control system comprises a control device. The control device estimates a temperature attained in the hydrogen tank after a predetermined time elapses with the accelerator operation amount at a maximum during an on operation of an accelerator, based on a temporal temperature gradient in the hydrogen tank and a temperature in the hydrogen tank, and when the temperature attained is no higher than a first predetermined temperature, performs discharge limit control for limiting a maximum value of the hydrogen discharge flow rate from the hydrogen tank to a predetermined flow rate.

Operating an internal combustion engine system includes combusting gaseous hydrogen fuel and gaseous hydrocarbon fuel at a first substitution ratio in a plurality of cylinders in an engine, inputting an emissions cost value and a hydrogen cost value to a fuel blending control system for the engine, and determining, by way of an electronic control unit of the fuel blending control system, a fuel blending control term based on the respective cost values. Operating the engine system further includes varying admission of at least one of the hydrogen fuel or the hydrocarbon fuel to an intake system for the engine based on the fuel blending control term, and combusting the hydrogen fuel and the hydrocarbon fuel at a second substitution ratio produced by the varied admission in the plurality of cylinders in the engine.

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

A compression ignition engine system allows use of hydrous fuels, in particular hydrous biofuels, with high water content (e.g., 20-85% water). The hydrous fuel is pressurized, and also preferably heated via the engine's exhaust gas, to increase its enthalpy, and is then directly injected into the engine cylinder(s) near top dead center. The system provides brake thermal efficiency increases of 20% or more versus a comparable system using conventional diesel fuel, while allowing the use of inexpensive undistilled or lightly distilled biofuels.

An apparatus for use with a combustion apparatus and an associated Selective Catalytic Reduction (‘SCR’) device, comprises a temperature sensing device configured to measure the temperature of an exhaust from the combustion apparatus; and an injection unit configured to inject hydrogen into a feed of oxidizer to the combustion apparatus. An amount of hydrogen is added to an oxidiser feed of the combustion apparatus sufficient to reach a temperature in the exhaust of at least about 270° C.

An ammonia engine includes: an engine body which includes a first cylinder and a second cylinder; an air supply unit which supplies air to each of the first cylinder and the second cylinder; an ammonia supply unit which supplies ammonia to each of the first cylinder and the second cylinder; an ammonia amount adjustment unit which adjusts an ammonia supply amount to the second cylinder by the ammonia supply unit to be larger than an ammonia supply amount to the first cylinder; and an exhaust gas supply unit which supplies an exhaust gas generated by the second cylinder to the first cylinder.

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

Disclosed herein are novel systems and methods for performing the following: decomposing water into hydrogen by using low-power consumption electrolysis, converting orthohydrogen into parahydrogen by using vibrational frequency, converting parahydrogen into atomic hydrogen, and mixing converted atomic hydrogen with combustible gas. The system uses a unique low-power hydrogen production cell to perform electrolysis on water. Hydrogen output from the production cell runs through coils under vibrational frequency to optimally convert orthohydrogen to parahydrogen. The system further comprises a magnetic reactor that is used to convert parahydrogen into atomic hydrogen, which is in turn mixed with combustible gas to create an eco-friendly fuel.

A system for supplying hydrogen gas to an engine is disclosed. The system includes a main line configured to send hydrogen gas produced in a hydrogen gas producer by electrolysis to a supply line; a sub-line configured to send hydrogen gas from a hydrogen absorbing alloy cylinder to the main line, a governor configured to maintain an engine rotation speed within certain range; and a control device. The governor sends a signal corresponding to the engine rotation speed to the control device. A pressure regulating valve is disposed in the sub-line to be downstream with respect to the hydrogen absorbing alloy cylinder to regulate a supply amount of added hydrogen. An opening degree of the valve is adjusted based on a signal from the control device corresponding to the opening degree of the valve for supplying the added hydrogen with an amount according to a load state of the engine.

An engine includes a reformer, a reforming-air adjuster, a reforming-fuel supply unit, a reformed-gas adjuster, and a control unit. The reformer is configured to reform fuel into a reformed gas. When a start signal is input, the control unit controls the reforming-air adjuster and the reforming-fuel supply unit to a reformable state in which the fuel is reformable in the reformer, and the control unit controls the reformed-gas adjuster so that the reformed gas flows through the reformed-gas adjuster with a degree of opening smaller than a normal degree of opening that is a degree of opening of the reformed-gas adjuster when composition of the reformed gas is in a stable state before the composition of the reformed gas becomes in the stable state, for a given period of time including at least a period immediately after the engine starts.