The development of LPG injection controller for reducing PM at exhaust pipe

摘要

The popularity of the diesel engine revolves around its fuel efficiency, reliability, and durability compared to the gasoline engine. However, the main disadvantage of diesel engine is the emission of particulate matter (PM) which is known as carcinogenic substance. Therefore recent progress in engine management and after-treatment systems has led to great improvement to satisfy strict emission regulations. To comply with powerful environment regulations, this study is focused on the decrease of PM (soot) as to increase significantly exhaust temperature. Therefore, HC injection is used as the method to go to the PM regeneration temperature in front of filters composed of diesel oxidation catalyst (DOC) and diesel particulate filter (DPF). And especially, LPG is used because it has good chemical reactions with exhaust. In this study we could manufacture the test bench through LPG injection - with which soot can be decreased-, construct 3 kinds of database (DB) according to quantity of temperature to decide the LPG injection quantity and develop DPF ECU algorithm.