Energy-saving ultra low emission dual-mode homogeneous compression-ignition engine based on fully variable valve mechanism

Abstract

The invention discloses an energy-saving ultra-low discharge dual-mode uniform engine, based on variable-throttle device, wherein a cylinder cover is a variable-throttle cylinder cover arranged with two throttle strike continuous changers and a variable-throttle phase device whose frame is arranged with a chain tooth around and connected with a crank of the engine via chain. The inventive engine can completely utilize the high-effect energy-saving ultra-low discharge character of uniform HCCI burning mode to switch between spark burning SI and HCCI burning mode according to working conditions, to save energy and ultra-low discharge. And the variable-throttle device can realize the control on different burning modes, and switch between two modes.

Description

Technical field: [0001] The invention belongs to internal combustion engines, in particular to an energy-saving ultra-low emission dual-mode homogeneous compression ignition engine based on a fully variable valve mechanism. Background technique: [0002] At present, the widely used gasoline engines are based on the spark ignition combustion mode. A large number of basic research results have proved that although various technical improvements have been made to the traditional spark ignition internal combustion engine (gasoline engine), it has been improving fuel utilization. The efficiency and the reduction of harmful emissions have reached the limit, and further development requires a breakthrough in the combustion theory of internal combustion engines. In particular, most of the engines currently produced at home and abroad will sacrifice fuel utilization to varying degrees in order to meet the increasingly stringent emission regulations, so as to reduce the emission of ha...

AI Technical Summary

Problems solved by technology

Due to the limitations of the characteristics of the gasoline fuel itself and many factors such as knocking, the gasoline engine can only use a lower compression ratio, which makes the thermal efficiency much lower than that of the diesel engine, and produces a large amount of NOx and incomplete combustion products. In addition, the gasoline engine needs to use the throttle Control the intake air volume, and the pumping loss at part load reduces the mechanical efficiency. The fuel utilization rate of gasoline engines is 30% lower than that of diesel engines, which is the limit of fuel utilization rate that traditional gasoline engines are difficult to overcome. In order to break through this limit, relevant experts at home and abroad Has been committed to exploring a new generation of combustion process for organizing fuel efficient and clean combustion and developing a new generation of internal combustion engine combustion theory

So far, although the homogeneous compression ignition of gasoline engines has been realized, its operating range is narrow, which is far from meeting the requirements of vehicle engines for various operating ranges.

In 2001, the U.S. Department of Energy pointed out that there are still 9 major difficulties in the HCCI combustion mode, which clearly pointed out that the narrow range of operating conditions and the switching between the two combustion modes have yet to be resolved

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