| 摘要 |
When an engine is driven in a compression self-ignited combustion region, a fuel injector injects a fuel into a cylinder in a negative-valve-overlap period where an exhaust valve and an intake valve are both closed. Then, the fuel is injected into the cylinder in an intake stroke. The injected fuel is compressed in a compression stroke to be self-ignited. When it is determined that a steep combustion occurs and a fuel injection quantity in the negative-valve-overlap period is greater than a lower determination threshold, the fuel injection quantity in the negative-valve-overlap period is reduced. When the fuel injection quantity is not greater than the lower determination threshold, an oxygen quantity in the cylinder is reduced.
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