Ignition and combustion control method of lean or diluted combustion of engine
A technology of dilution combustion and control method, applied in engine control, machine/engine, electrical control and other directions, can solve the problems of lack of ignition control method, engine damage and lack of control means in gasoline compression ignition combustion, so as to improve fuel economy, Effects of improved fuel economy and extended operating range
Inactive Publication Date: 2014-08-27
TIANJIN UNIV
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Problems solved by technology
Therefore, gasoline compression ignition combustion lacks a direct ignition control method to achieve precise control of ignition timing
Secondly, gasoline compression ignition combustion is very sensitive to ambient temperature, which makes it difficult to work normally in the compression ignition combustion mode when the engine is in a cold state
Finally, due to the lack of means to control the ignition time, gasoline compression ignition combustion can easily cause high heat release rate and pressure rise rate under heavy load
A high pressure rise rate is not conducive to the long-term stable operation of the engine, and an excessively high pressure rise rate will cause damage to the engine
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[0024] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0025] The control method proposed by the present invention is: on a gasoline engine designed for gasoline compression ignition, a premixed lean or diluted mixture is formed by injection in the intake port, and the mixture is introduced into the cylinder. The diluted mixture in the intake port is achieved by introducing external exhaust gas recirculation in the intake system, whether it is through a high-pressure external exhaust gas recirculation circuit or a low-pressure external exhaust gas recirculation circuit or a combination of both external exhaust gas recirculation circuits method is available. The injection of premixed fuel is not limited to the port injection method, and can also directly introduce excess air or air-exhaust gas mixture into the cylinder, and then obtain it by direct injection of f...
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The invention discloses an ignition and combustion control method of the lean or diluted combustion of an engine. The method comprises, in the internal-combustion engine with an in-cylinder direct injector, igniting layered mixed gas through a spark plug to form flames, and utilizing the energy released by the flames to enable residual in-cylinder pre-mixed diluted or lean mixed gas to form stable and rapid combustion or multi-point autoignition; inducing cooled combusted exhaust gas into a gas intake channel through an EGR (exhaust gas recirculation) loop to convert the combustion process of the engine into a rapid flame propagation combustion mode when the engine encounters knockings or exceeds the maximum explosion pressure; when the in-cylinder thermal state is insufficient to meet the requirements of layered mixed gas ignition or to form stable compression ignition, improving the in-cylinder thermal state by inducing internal residual exhaust gas. The ignition and combustion control method of the lean or diluted combustion of the engine can overcome the gasoline compression ignition and combustion problem of pre-mixed diluted or lean mixed gas ignition and combustion process control.
Description
technical field [0001] The invention relates to an engine combustion control technology. Background technique [0002] Gasoline compression ignition (GCI) has become a promising new engine combustion technology because of its potential to simultaneously improve fuel economy and engine exhaust emissions. In the development history of gasoline compression ignition technology, due to different application platforms and control strategies, it is also called premixed charge compression ignition technology, homogeneous charge compression ignition technology, controlled spontaneous combustion technology and partial premixed charge ignition technology. Compression ignition technology, etc. Although the above technologies are different in implementation, their technical cores belong to the category of compressed gasoline ignition and combustion. One of the common characteristics of gasoline compression ignition combustion technology is that the dilute or thin air-fuel mixture spont...
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IPC IPC(8): F02D43/00F02D21/08
Inventor 赵华陈韬谢辉何邦全
Owner TIANJIN UNIV