An engine including an exhaust bypass valve and an intake bypass valve. The exhaust bypass valve is disposed in an exhaust bypass channel connecting an outlet of an exhaust manifold and an exhaust outlet of a turbocharger to each other. The intake bypass valve is disposed in an intake bypass channel connecting an inlet of an intake manifold and an inlet of the turbocharger. An intake pressure sensor detects a pressure of the intake manifold. If an instruction value indicating an upper limit or a lower limit of the valve opening degree of the intake bypass valve is continuously output for a predetermined time or more, an engine control device determines that an abnormality occurs in at least one of the exhaust bypass valve and the intake bypass valve.

An engine including an exhaust bypass valve and an intake bypass valve. The exhaust bypass valve is disposed in an exhaust bypass channel connecting an outlet of an exhaust manifold and an exhaust outlet of a turbocharger to each other. The intake bypass valve is disposed in an intake bypass channel connecting an inlet of an intake manifold and an inlet of the turbocharger. An intake pressure sensor detects a pressure of the intake manifold. If an instruction value indicating an upper limit or a lower limit of the valve opening degree of the intake bypass valve is continuously output for a predetermined time or more, an engine control device determines that an abnormality occurs in at least one of the exhaust bypass valve and the intake bypass valve.

An engine including an exhaust bypass valve and an intake bypass valve. The exhaust bypass valve is disposed in an exhaust bypass channel connecting an outlet of an exhaust manifold and an exhaust outlet of a turbocharger to each other. The intake bypass valve is disposed in an intake bypass channel connecting an inlet of an intake manifold and an inlet of the turbocharger. An intake pressure sensor detects a pressure of the intake manifold. If an instruction value indicating an upper limit or a lower limit of the valve opening degree of the intake bypass valve is continuously output for a predetermined time or more, an engine control device determines that an abnormality occurs in at least one of the exhaust bypass valve and the intake bypass valve.

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 of operating a dual fuel engine includes conveying intake air, and a first fuel as a vapor and as a liquid, into a combustion cylinder in an engine, and directly injecting a second fuel into the combustion cylinder to form a first combustion charge of the first fuel as a vapor and as a liquid, the second fuel, and intake air. The second fuel is ignited to initiate combustion of the first combustion charge. Operating the dual fuel engine further includes varying at least one of, a vapor proportion of the first fuel or a total proportion of the first fuel, in a subsequent combustion charge to mitigate undesired combustion. The first fuel can include a liquid alcohol fuel. The second fuel can include a liquid compression-ignition fuel. Related apparatus and control logic is also disclosed.

Systems, apparatuses, and methods of controlling an ignitor are disclosed. A method includes: receiving, by a controller, fuel quality data regarding a fuel for a spark-ignition engine; determining, by the controller, a fuel quality metric based on the fuel quality data; and controlling, by the controller, an ignition energy characteristic of an ignitor in response to the fuel quality metric.

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.

A gas engine power generating system includes an electricity generating component including a gas engine, an alternating-current electricity generator, a cooling system portion, an exhaust system portion, an engine control unit, a battery, and an alternating current/direct current inverter, and a housing. A plurality of the electricity generating components are provided as electricity generating units, and are accommodated in the housing. Each electricity generating unit is configured to be capable of generating electricity independently, the plurality of electricity generating units are electrically connected together in parallel, operation, shut-down, and the amount of generated electric power for all the electricity generating units are managed by a total control unit, and direct-current power from each electricity generating unit is aggregated and converted to alternating-current power, and is supplied to the load side.

Various methods and systems are provided for a method for a multi-pressure fueling system. In one example, the multi-pressure fueling system includes providing a first fuel delivery pressure enabling high pressure direct injection of a fuel at a first injector and a second fuel delivery pressure insufficient for high pressure direct injection, at a second injector, based on engine operation.

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.