位于美国俄亥俄州克利夫兰的州际柴油机公司（InterstateDiesel）开发出一种可降低机车柴油机燃油消耗和排放的喷油器。据该公司声称：这种被命名为Microsac的替代型喷油器具有一个全新设计的喷嘴和一个享有专利权的止回阀，这两个部件促进了烟度、碳氢化合物和一氧化碳排放值 Interstate Diesel, based in Cleveland, Ohio, USA, has developed a fuel injector that reduces fuel consumption and emissions from locomotive diesel engines. According to the company, the alternative injector, named Microsac, features a newly designed nozzle and a patented check valve that promote smoke, hydrocarbon and carbon monoxide emissions