Fuel on-site mixing and compressed ignition internal combustion engine and control method

Abstract

The invention provides a fuel field mixing compression ignition internal combustion engine and a control method thereof, in particular relates to fuel preparation, supply and combustion control of a combustion engine. The invention adopts a high-octane and high-cetane fuel field mixing and auxiliary ignition technology, and can meet the requirement that the internal combustion engine makes use of the fuel of different octane numbers under different loads, namely, more high-cetane fuel is mixed in the high-octane fuel under low load or ignition is assisted in, to improve the ignition property of the mixed fuel so that the mixed fuel can be fired reliably under low load and temperature with the firing time controllable. The quantity of high-cetane fuel to be mixed in is reduced under medium load; a signal high-octane fuel is adopted under large load to avoid engine detonation. By adopting the fuel field mixing compression ignition combustion mode, not only an even premixing compression ignition engine is prevented from being on fire under low load, but also the working condition range under large load can be widened. In addition, the power performance of the engine is improved. In this way, the even premixing compression ignition engine is practical.

Description

technical field [0001] The invention provides a fuel on-site mixed compression ignition internal combustion engine and a control method, in particular to fuel preparation, supply and combustion control of a combustion engine. Background technique [0002] Since the 1970s, with the widespread application of electronic technology and exhaust gas after-treatment technology, the fuel consumption and harmful emissions of internal combustion engines have been greatly reduced. The traditional gasoline engine belongs to premixed homogeneous combustion. Due to the limitation of many factors such as knocking, the compression ratio is low and the thermal efficiency is low. The use of electronic control and exhaust after-treatment devices can make the gasoline engine achieve extremely low emissions. Compared with gasoline engines, diesel engines have higher compression ratio, higher thermal efficiency and superior fuel economy. However, the combustion of traditional diesel engines is th...

AI Technical Summary

Problems solved by technology

High-pressure common rail, variable compression ratio, variable valve timing, intake air preheating and other technical means can effectively broaden the operating range of homogeneous premixed compression ignition engines, but high-pressure common rail, variable compression ratio, variable Valve timing and other technologies are expensive and require a lot of engine modification, so it is difficult to popularize and use them in the short term, and the intake warm-up time is long, which makes it difficult to meet the actual requirements of vehicle transient control

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