Fuel compositions for internal combustion engines, and more particularly, fuel compositions for use in fuel-injected internal combustion engines are described. The fuel compositions comprise a major amount of a liquid hydrocarbon fuel and a minor, property-improving amount of a hydrocarbon-soluble dispersant prepared generally by the post-treatment of a nitrogen-containing composition with mono- and polycarboxylic acids which may be aliphatic or aromatic carboxylic acids although aromatic polycarboxylic acids are preferred. The nitrogen-containing compositions which are post-treated in accordance with the present invention are obtained by reacting an acylating agent with alkylene polyamines or alkanol amines. When fuel conpositions of the present invention are utilized in internal combustion engines, and in particular, fuel-injected internal combustion engines, the amount of solid deposits of the various parts of the internal combustion engines are reduced. In particular, the use of such fuels prevents or reduces intake system deposits and injector nozzle deposits. Accordingly, methods for reducing or preventing the buiid-up of deposits in internal combustion engines also are described.
本文描述了用于内燃机的燃料组合物,特别是用于燃油喷射内燃机的燃料组合物。这些燃料组合物包括主要量的液态碳氢化合物燃料和少量的可改善性能的碳氢化合物可溶性分散剂,后者一般是通过用单
羧酸和多
羧酸对含氮组合物进行后处理而制备的,单
羧酸和多
羧酸可以是脂肪族或芳香族
羧酸,但芳香族多
羧酸更可取。根据本发明进行后处理的含氮组合物是通过酰化剂与亚烷基
多胺或烷醇胺反应获得的。将本发明的燃料组合物用于内燃机,特别是喷射式内燃机时,可减少内燃机各部件的固体沉积物。特别是,使用这种燃料可以防止或减少进气系统沉积物和喷油器喷嘴沉积物。因此,还介绍了减少或防止内燃机沉积物形成的方法。