Abstract

Current stringent emission legislation, market and environmental concern governs the automotive research for developing high-efficiency and low emission engines. Vehicle manufacturers meet the present emission norms using a combination of in-cylinder emission reduction methods and exhaust after-treatment devices. Proposed future emission norms are even more stringent; and thus, newer technologies are required to satisfy emission standards worldwide. Low temperature combustion (LTC) engines have potential to deliver higher fuel conversion efficiency and simultaneous reduction of NO x and soot emissions to an ultralow level. The LTC engines can also reduce the heavy dependence on NO x and soot after-treatment devices for meeting the emission norms. In this chapter, LTC principles along with different proposed LTC strategies are discussed in detail. The LTC strategies are broadly categorized into homogeneous charge compression ignition (HCCI) and partially stratified charge compression ignition (SCCI). The SCCI strategy is further classified as thermal stratification- and fuel concentration stratification-based combustion process. The partially premixed compression ignition (PPCI) and reactivity-controlled compression ignition (RCCI) are the two main engine combustion modes with fuel concentration stratification are discussed in this chapter. Thermally stratified compression ignition mode is also described in the present chapter.

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