| 摘要 |
A 4-stroke cycle engine with EGR system equipped with a particulate filter, an external EGR system, and an exhaust valve sub-lift type internal EGR system is provided. With the engine, reduction of NOx emission by EGR can be achieved without incurring deterioration in engine durability by enabling operation of the engine with proper EGR rate all over the operating ranges of the engine through making it possible to compensate for reduction in EGR amounts due to reduced DPF pressure difference which occurs when recovering operation of the DPF is performed.
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