Device and method for expanding compression-ignition type gasoline engine load range

Abstract

The present invention relates to a device expanding the load range of a compression ignition gasoline engine and a method thereof. The device comprises a cylinder which is respectively connected with an air inlet channel and an exhaust channel by a vale, a piston which moves up and down in the cylinder and is provided with a drop pit at the top, an electric heater plug with a heating end extended into the drop pit when the piston runs to an upper stop point, and an oil atomizer with a nozzle opposite to the drop pit when the piston runs to the upper stop point. The method has the steps as follows: the oil atomizer sprays oil respectively during an air intake stroke and a compression stroke to form delaminated mixed gas in dense and thin areas; the electric heater plug heats the mixed gas in the cylinder to form heat delamination; the area with dense gas and high temperature in the drop pit of a combustion chamber fires firstly and ignites other areas to fire accordingly. The present invention controls the dense and the thin areas to fire successively, so as to reduce the pressure increase rate in the cylinder, ensure the reliable firing and achieve the purpose of developing HCCI combustion executable high and low charge ranges at the same time.

Description

technical field [0001] The invention relates to the technical field of combustion of automobile engines and internal combustion engines, in particular to a device and method for expanding the load range of a compression ignition gasoline engine. Background technique [0002] Homogeneous Charge Compression Ignition (HCCI) or Controlled Auto Ignition (CAI) combustion methods applied to compression-ignition gasoline engines can significantly improve the combustion thermal efficiency of gasoline engines, greatly reduce fuel consumption, and simultaneously oxidize nitrogen Compared with ordinary gasoline engines, the emission of NOx is reduced by more than 95%, which is a research hotspot in the world at present. [0003] However, due to the limitation of misfire and deflagration, the operating range of homogeneous charge compression combustion HCCI engine is narrow. Under low load conditions, the combustion efficiency is low and ignition is difficult, so that HCCI combustion ha...

AI Technical Summary

Problems solved by technology

But each method has disadvantages: When expanding high load, the low load limit is also improved

In addition, even if the HCCI high load is extended, the advantage of NOx reduction becomes less obvious

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