Coking in and around the injector nozzles of indirect injection compression ignition engines is reduced by means of distillate fuel into which has been blended suitable concentrations of
(a) organic nitrate ignition accelerator,
(b) copolymer of an alpha-olefin having from 8 to 30 carbon and an N-substituted maleimide wherein the n-substituents are organic radicals having from 3 to 60 carbons and from 1 to 5 amine nitrogens, said copolymer having from 4 to 20 repeating olefin-maleimide units, and
(c) hydrocarbyl amine having from 3 to 60 carbons and from 1 to 10 nitrogens.
间接喷射压缩点火发动机喷油器喷嘴内部和周围的结焦可以通过馏分燃料来减少,在馏分燃料中掺入适当浓度的以下物质:(a) 有机
硝酸盐点火
促进剂;(b) 具有 8 至 30 个碳原子的α-烯烃和 N-取代的马来
酰亚胺的共聚物,其中 n-取代基是具有 3 至 60 个碳原子和 1 至 5 个
硝基胺的有机基,所述共聚物具有 4 至 20 个重复的烯烃-马来
酰亚胺单元;(c) 具有 3 至 60 个碳原子和 1 至 10 个硝基的烃基胺。