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1.研究背景本公司到1976年为止,一直把装有二冲程发动机的轻型汽车作为基本车型。主要研究1000毫升以下的小型轿车用发动机。1975年和1976年由于排气法规更加严格,所以迫切要求建立小排量(单缸排量250～300毫升)发动机的排气净化系统。为此,把第一阶段的排气指标定为:NO_x0.5～0.6克/公里,同时对二冲程和四冲程机的优劣进行了对比研究。二冲程发动机,用比较简单的机构就能发出较大的扭矩,这对轻型汽车是有利的。但是
1. Research Background As of 1976, the Company has been using light-duty vehicles with two-stroke engines as the basic models. The main research 1000 milliliters of small cars engine. In 1975 and 1976, due to stricter exhaust regulations, there was an urgent need to establish an exhaust gas purification system for small-displacement engines (250 to 300 cc). To this end, the first phase of the exhaust indicator as: NO_x0.5 ~ 0.6 g / km, while the pros and cons of two-stroke and four-stroke machine were compared. Two-stroke engines, with relatively simple mechanism can issue a larger torque, which is beneficial for light vehicles. but