| 摘要 |
Provided is a natural gas engine that is equipped with an exhaust gas introduction mechanism that introduces exhaust gas (G) into a cylinder during an intake stroke, and in which the amount of diesel fuel (f) injected into a cylinder is set to a diesel fuel amount for idling condition across the entire operating region of an engine, engine output is increased or decreased by increasing or decreasing the amount of a natural gas fuel (C), and fuel injection of the diesel fuel (f) into a cylinder is performed using multi-injection in a high load region in which the accelerator opening degree (±) is greater than a preset first opening degree (±1). As a result, natural gas fuel is ignited in a reliable and stable manner across the entire operating region and highly efficient combustion is performed using a small amount of fuel and a small amount of intake air in an engine that uses diesel fuel as an ignition source and natural gas fuel as a main fuel. In addition, knocking resulting from detonation is minimized even when the engine operation condition is in a high load region. |
