Disclosed is a method for discharging the pressure in a fuel supply rail of an injection system of an engine, the fuel injection rail connected to a fuel tank by piezo-electric injectors, each including a needle and a piezo-electric actuator pressing on a servo valve of the injector. The injection system includes a fuel pressure sensor and an electrical generator transmitting electric current pulses to each actuator. When the accelerator is released, a first electrical command allows determination of a moment of opening of the respective servo valve without triggering an injection. A second electrical command triggers a discharge of fuel from the fuel supply rail to the tank and therefore to discharge the pressure of the supply rail without triggering an injection. The second electrical command charges the piezo-electric actuator between a first voltage level that opens the servo valve, and a second voltage level triggering an injection.

An internal combustion engine with at least one combustion chamber, at least one fuel delivery line for the delivery of fuel to at least one combustion chamber, and at least one differential pressure control valve for controlling the pressure in the at least one fuel delivery line. The at least one differential pressure control valve is configured to perform a valve opening or valve closing movement based on a pressure difference between the at least one fuel delivery line and a reference volume having a reference pressure. The internal combustion engine further includes at least one pressure relief valve, separate from the at least one differential pressure control valve, and configured to open to cause a pressure relief in the reference volume and a decrease in the reference pressure if a drop occurs in the power to be performed by the internal combustion engine.

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.

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.

A method of manufacturing an internal combustion engine is provided. The engine includes a cylinder forming member, a piston reciprocatably accommodated in a cylinder, an injector which supplies fuel into a combustion chamber, and a heat insulating layer covering at least a part of a combustion-chamber wall surface and having a lower heat conductivity than the combustion-chamber wall surface. The method includes applying a coating material that is a material of the heat insulating layer to the combustion-chamber wall surface, assembling the piston to the cylinder forming member while the coating material is uncured, and heating the coating material to be cured by combusting the fuel injected from the injector and reciprocating the piston. The heating the coating material includes injecting the fuel from the injector at least in an early stage of the heating so that the injected fuel adhering to the surface of the coating material is suppressed.

Methods and systems are provided for injecting gaseous fuel during an engine start. In one example, a method comprises generating gaseous fuel via a fuel gasification device and injecting the gaseous fuel via a fuel injector. The fuel injector is configured to inject adjacent to an ignition device.

A method includes: initiating a low engine-out NOx (LEON) mode by controlling a component of a vehicle having an aftertreatment system to decrease an instantaneous engine-out NOx (EONOx) amount; comparing a temperature of the aftertreatment system during the LEON mode to a warm-operation threshold temperature; responsive to determining that the temperature of the aftertreatment system exceeds the warm-operation threshold temperature, disengaging the LEON mode; responsive to determining that the temperature of the aftertreatment system is below the warm-up operation threshold temperature, comparing information indicative of an operating status of the vehicle to a LEON exit threshold; and disengaging the LEON mode responsive to determining that the information indicative of the operating status of the vehicle during the LEON mode exceeds the LEON exit threshold.

Separation of carbon dioxide from the exhaust of an internal combustion engine, the production of hydrogen from water, and reformation of carbon dioxide and hydrogen into relatively high-octane fuel components.

Separation of carbon dioxide from the exhaust of an internal combustion engine, the production of hydrogen from water, and reformation of carbon dioxide and hydrogen into relatively high-octane fuel components.

The present invention provides a closed-loop control method for an electronic fuel injection piston-engine on an unmanned aircraft consisting of the following steps: determination of a set of control coefficients; preliminary determination of fuel injection flow; determination of the injection limit; determination of the actual injectable value; perform fuel injection; the opening of the air intake valve is controlled to ensure that the fuel-air ratio always remains within a specified range. The present invention also provides a method for modeling the operation of an engine at each operating range. In addition, the method of physically simulating the operating conditions according to the pressure ranges of the engine is also proposed. The simulation method to find the control coefficients corresponding to each operating model of the engine is presented, the fuel injection closed-loop control structure is built on a control simulation software.