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BMW公司研制的可变气缸数发动机,是使6缸发动机中的半数气缸停止工作,成为部分负荷运转的直列6缸电子控制燃油喷射式汽油发动机.目前,已达到先进技术的试验阶段。此发动机的排气量分2.8升和3.5升两种.在部分负荷时,通过电子控制,停止3个气缸的燃油喷射[见图(a)的右半部],同时用另外继续工作的3个缸[见图(a)的左半部]中燃烧后排出的气体代替新气通入,以保证气体循环,称之为TZA系统(即部分负荷气缸停气)。装有这种系统的汽车在欧洲公路上行驶时可节省25％的燃料。
The variable cylinder count engine developed by BMW is an in-line six-cylinder electronically controlled fuel-injection gasoline engine that stops half of six-cylinder engines and becomes partially loaded, and has now reached the pilot stage of advanced technology. The displacement of this engine is divided into 2.8 liters and 3.5 liters, and at partial load, the fuel injection of three cylinders is stopped by electronic control [see the right half of Figure (a)], while the other 3 In order to ensure the circulation of gas, it is called the TZA system (that is, part-load cylinder is stopped) by replacing the fresh air with gas discharged from the combustion chamber [see the left half of Figure (a)]. Cars equipped with this system save 25% on fuel on European roads.