2134/35202 Lei Zhou Lei Zhou Kai Dong Kai Dong Jianxiong Hua Jianxiong Hua Haiqiao Wei Haiqiao Wei Rui Chen Rui Chen Yiyong Han Yiyong Han Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine Loughborough University 2018 SACI Knock Internal EGR External EGR Split injection Mechanical Engineering Engineering not elsewhere classified 2018-10-05 16:07:14 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Effects_of_applying_EGR_with_split_injection_strategy_on_combustion_performance_and_knock_resistance_in_a_spark_assisted_compression_ignition_SACI_engine/9228518 Spark assisted compression ignition (SACI) is a proven method for extending the load range and controlling the combustion phase of homogeneous charge compression ignition (HCCI) while maintaining high thermal efficiency. However, the occurrence of abnormal combustion, such as knock, limits the improvement of efficiency in SACI combustion. In this study, the effects of a coupling strategy, which combines internal/external exhaust gas recirculation (i & e-EGR) and split injection, on knock suppression in SACI mode were investigated in a high-compression-ratio, single-cylinder gasoline engine with a fully variable valve system. During the experiment, the mass of intake air remained constant while e-EGR was added. The results show that the coupling strategy combines the advantages of e-EGR and split injection, providing an effective method for resisting knock and improving engine efficiency. The results also demonstrate that applying e-EGR to SACI combustion significantly decreases the knock intensity by effectively reducing the in-cylinder temperature. In addition, the effect of split injection on knock suppression is related to the initial in-cylinder temperature and fuel stratification. With high initial in-cylinder temperature, the relationship between knock probability and split injection timing is non-monotonic. However, with low initial in-cylinder temperature, the capacity of resisting knock monotonically increases with the delay of secondary injection timing.