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当前发动机的发展趋势是最充分地利用二次能源,并且对降低运输用内燃机废气中的有害成分提出了日益严格的要求。这样一来,不可避免地会增大排气管道阻力,从而恶化扫气条件,增加残余废气量,最综导致内燃机活塞中气体交换条件受到破坏,活塞热应力升高。寻求和制订气缸背压升高的复合式发动机工作过程的优化方法就成为当前发动机制造业的一项迫切任务。
The current trend of engines is to make the best use of secondary energy sources and to place increasingly stringent demands on reducing the harmful components in the exhaust gas of transportation internal combustion engines. As a result, it will inevitably increase the exhaust pipe resistance, thus deteriorating scavenging conditions, increasing the amount of residual exhaust, the most comprehensive lead to the internal combustion engine piston gas exchange conditions are damaged, the piston thermal stress increases. It has become an urgent task for the current engine manufacturing industry to seek and make the optimization of the working process of the hybrid engine with increased cylinder backpressure.