A kind of thermal insulation combustion auxiliary device for internal combustion engine

Abstract

The invention provides a novel heat-insulation combustion auxiliary device for an internal-combustion engine. The device comprises an exhaust gas recirculation (EGR) pump, a high-pressure gas pipe, a high-pressure gas track, exhaust gas distributing pipes, electrically-controlled gas nozzles, an EGR pipe and an ECU; the electrically-controlled gas nozzles are connected with the high-pressure gas track through the exhaust gas distributing pipes; the high-pressure gas track is connected with the EGR pump through the high-pressure gas pipe; when proper heat insulation is required to be performed on the engine, the ECU issues a command, the electrically-controlled gas nozzles mounted on a gas cylinder wall are opened, high-pressure engine exhaust gas is sprayed in, a vortex rotating around the central line of a gas cylinder is produced through movement relative to a cylinder liner, and the rotating direction of the vortex is identical with the direction of a vortex formed by a gas channel in a pit of a combustion chamber, so that vortex flow zones are formed above the top surface of a piston and nearby heat-transfer surfaces such as the surface of the cylinder liner and the like, proper insulation is performed on the wall surface of the combustion chamber and a high-temperature combustion area, wall surface heat transfer is reduced, and the low-heat-dissipation combustion process is realized. A certain degree of EGR is realized, the combustion temperature is reduced, and the NOx emission is reduced.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a thermal insulation combustion auxiliary device for internal combustion engines. Background technique [0002] Insulated combustion technology is a combustion technology developed for low heat dissipation engines, and the research on low heat dissipation engines began in the 1970s. Heat insulation design reduces heat transfer loss and improves engine thermal efficiency. At the same time, the cooling water system can be eliminated to reduce the size and weight of the machine. [0003] The most commonly used method before is to coat the thermal barrier material in the combustion chamber. In this way, due to the heat insulation of the combustion chamber during the intake process, the combustion chamber wall faces the heat transfer to the gas, which will increase the compression end temperature and shorten the combustion delay period of the fuel. The...

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Problems solved by technology

[0006] However, due to the poor durability and reliability of thermal barrier materials, the application of low heat dissipation technology on internal combustion engines has not been effectively realized, which limits the promotion of this technology

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