Premixing compression internal-combustion engine and operation method thereof

Abstract

A premixing compression internal-combustion engine and an operation method thereof belong to the technical field of compression internal-combustion engine. A crankshaft is mounted in a cylinder body through a bearing and hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to a piston; a cavity is formed in the upper part of the cylinder body, and the piston is in movable sealing fit with the wall of the cavity in the cylinder body; an oil injector is arranged at the upper end of the wall of the cavity in the cylinder body, a cylinder cover is arranged at the top of the cylinder body, and an intake valve and an exhaust valve are respectively arranged between the cylinder cover and the cylinder body and respectively communicated with the cavity; one end of a gas adjusting valve is communicated with a gas storage tank, and the other end of the gas adjusting valve is communicated with the cavity through the cylinder cover. The operation method comprises the following steps: preheating compressed air at the initial stage of start, igniting a premixed gas during starting, conducting expansion action of the premixed gas, feeding exhaust into the gas storage tank, realizing exhaust release of the gas storage tank when inspiration finishes and compressing the premixed gas. Through reciprocating the operation, the internal-combustion engine enters a stable working state.

Description

technical field [0001] The invention belongs to the technical field of compression ignition internal combustion engines, in particular to a premixed compression ignition internal combustion engine and its operating method. Background technique [0002] In the current field of internal combustion engine technology, homogeneous compression ignition (HCCI) technology has become the focus of development and research. It has the characteristics of low combustion temperature, high thermal efficiency and low pollution emissions. Internal combustion engines using homogeneous compression ignition (HCCI) technology, It is the most promising to replace the gasoline internal combustion engine and diesel internal combustion engine commonly used today, and become the main force of the next generation internal combustion engine. [0003] However, there are still some technical problems that cannot be solved in internal combustion engines using homogeneous compression ignition (HCCI) techno...

AI Technical Summary

Problems solved by technology

[0003] However, there are still some technical problems that cannot be solved in internal combustion engines using homogeneous compression ignition (HCCI) technology:

[0004] 1. The starting point of combustion is difficult to control

[0005] The compression ignition method is adopted, and spark ignition is not used. The starting point of combustion can only be controlled indirectly by changing the compression ratio and controlling the initial temperature of the mixture, so that it is very difficult to control the starting point of combustion.

[0006] 2. Narrow operating range

[0007] When the internal combustion engine is running at high load, it will be restricted by knocking, and when it is running at too low load, it will be restricted by flameout, so that the internal combustion engine can only run at the low and medium load state

[0008] 3. Difficulty starting

However, the above-mentioned methods are all at the expense of sacrificing the intake air volume. For the exhaust gas residual method in the cylinder, a part of the exhaust gas is kept in the cylinder, and then a part of fresh air is sucked in to increase the initial temperature of the mixture; while the exhaust gas recirculation method, It is to suck the exhaust gas and fresh air into the cylinder at the same time to increase the initial temperature of the mixture; this greatly reduces the intake of fresh air, resulting in the internal combustion engine using the above-mentioned homogeneous compression ignition (HCCI) technology, which cannot operate under high load. normal operation

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