本文介绍助力车、链锯和摩托车用四种50mL 装填催化剂的发动机。发动机的最佳汽化作用、冷却活塞形状和间隙、扫气及排气谐调等措施,都可使发动机运转于稀的工况下。放热反应时必须有足够的氧,也必须使转换为氧化催化剂的能量最小。已采取辅助措施来缩短催化剂的起燃时间和使温度范围保持在限值内。 This article describes mover, chain saw and motorcycle with four 50mL catalyst loading engine. Engine optimal vaporization, cooling piston shape and clearance, scavenging and exhaust harmonization and other measures, can make the engine run in dilute conditions. There must be sufficient oxygen in the exothermic reaction and the energy converted to the oxidation catalyst must also be minimized. Additional measures have been taken to shorten the catalyst’s light-off time and keep the temperature range within limits.