Special HCCI (Homogeneous Charge Compression Ignition) engine and realization method thereof

Abstract

The invention relates to a special HCCI (Homogeneous Charge Compression Ignition) engine and a realization method thereof. A volume-variable container is arranged to be communicated with a space in a cylinder, the volume of the cylinder is accordingly changed by changing the volume of the volume-variable container, and the compression ratio of the cylinder is changed accordingly, that is to say, the volume of the volume-variable container is increased before ignition time, so that the condition required by HCCI can not be achieved in the cylinder; and the volume of the volume-variable container is rapidly reduced at ignition time, so that the pressure and the temperature in the cylinder are instantaneously increased to realize the HCCI, and the purpose of engine HCCI is achieved.

Description

technical field [0001] The invention relates to an HCCI engine and its realization method, in particular to a special-purpose HCCI engine and its realization method. Background technique [0002] The energy saving and environmental protection performance of HCCI (Homogeneous Charge Compression lgnition) engine is well known to all. [0003] However, there are many factors that affect the realization of HCCI combustion, such as intake air pressure, temperature, intake air volume, fuel concentration, latent heat of vaporization, self-ignition properties, air-fuel ratio, mixture uniformity, residual exhaust gas coefficient and reaction characteristics, compression Ratio, valve timing, engine speed, engine temperature and heat transfer factors, etc. These factors interact with each other and change at any time, so it is difficult to ensure the stability of the engine operating condition. [0004] In order to realize the combustion method of HCCI, various measures can be taken,...

AI Technical Summary

Problems solved by technology

These factors affect each other and change at any time, making it difficult to ensure stable engine conditions

[0004] In order to realize the combustion method of HCCI, various measures can be taken, such as variable intake air temperature, variable exhaust gas recirculation, variable compression ratio, variable valve timing, variable injection timing and injection quantity, variable combustion characteristics etc., but single use of these measures can only achieve HCCI combustion within a certain range of operating conditions

[0005] Gasoline engines control the timing of combustion by ignition of spark plugs, and diesel engines control ignition timing by fuel injection. The existing HCCI engines do not have a method to directly control the timing of ignition. There are problems such as difficult control of ignition timing, difficulty in cold start, narrow working range, and rough work under heavy loads.

[0006] In terms of mixture formation, the fuel injection method has higher requirements on the fuel supply system and injection pressure, and the injected fuel particles are larger, which affects the combustion effect

For those fuels with high viscosity and poor volatility, it is more difficult to form a high-quality mixture

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