A device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine includes a gear chamber (3), a connecting disc (5) and a high-pressure fuel pump (2), wherein the gear chamber (3) and the connecting disc (5) are assembled in the diesel engine, and the high-pressure fuel pump (2) is arranged at a left end surface outside the gear chamber. A main shaft end of the high-pressure fuel pump (2) extends into the gear chamber (3) and is connected to the connecting disc (5). A right end surface of the connecting disc (5) is connected to a timing gear (6) of a fuel injection pump. A right end surface of the timing gear (6) of the fuel injection pump is provided with three penetrating circular-arc waist-shaped holes (61) that are away from the center and equally spaced along the circumference direction. Annular sizing blocks (63) are arranged on the waist-shaped holes (61). A penetrating circular hole (68) is arranged at a tail end of at least one of the waist-shaped holes (61) in a counterclockwise direction and away from the waist-shaped hole (61). The circular hole (68) is provided with a T-shaped nut (65), and the axis of the T-shaped nut (65) is in parallel with the end surface of the timing gear (6) of the fuel injection pump. A support screw (67) is arranged in the T-shaped nut (65), and the screw head of the support screw (67) is jacked against the annular sizing block (63). A method for adjusting a fuel supply advance angle of a multi-cylinder diesel engine is also disclosed. The adjusting device and the adjusting method are convenient for adjusting a fuel supply advance angle and therefore have high adjustment precision.

A method for controlling an engine in various operating modes and for controlling an engine having dual injectors, may include selecting a number of injectors configured to inject fuel based on an operating mode of the various operating modes, and injecting fuel based on a selection of whether to inject fuel while an intake valve is open, or to inject fuel while the intake valve is closed.

A method for controlling an engine in various operating modes and for controlling an engine having dual injectors, may include selecting a number of injectors configured to inject fuel based on an operating mode of the various operating modes, and injecting fuel based on a selection of whether to inject fuel while an intake valve is open, or to inject fuel while the intake valve is closed.

An apparatus and method for operating an engine in multiple combustion modes includes storing a gaseous fuel as a compressed gas; the engine is operated in a first combustion mode when an injection or storage pressure of the gaseous fuel is greater than or equal to a threshold pressure, the engine is operated in a second combustion mode when the injection or storage pressure is less than the threshold pressure; in the first combustion mode, the gaseous fuel substantially burns by diffusion combustion; and in the second combustion mode, the gaseous fuel substantially burns by one of partially-premixed combustion and premixed combustion.

An apparatus and method for operating an engine in multiple combustion modes includes storing a gaseous fuel as a compressed gas; the engine is operated in a first combustion mode when an injection or storage pressure of the gaseous fuel is greater than or equal to a threshold pressure, the engine is operated in a second combustion mode when the injection or storage pressure is less than the threshold pressure; in the first combustion mode, the gaseous fuel substantially burns by diffusion combustion; and in the second combustion mode, the gaseous fuel substantially burns by one of partially-premixed combustion and premixed combustion.