Ultrahigh-supercharging turbo-charging Miller cycle engine

Abstract

The invention discloses an ultrahigh-supercharging turbo-charging Miller cycle engine which comprises a turbocharger and a Miller cycle engine body. The supercharge ratio of the turbocharger can exceed 2.5, but the compression ratio of the Miller cycle engine body is as low as 4. A turbine in the turbocharger can absorb much power and is a variable turbine geometry (VTG) turbine. The turbocharger can be a centrifugal supercharger, or a roots pump supercharger or a rotor pump and provides the condition that heat work absorbed by the turbine is very close to releasable heat work contained in exhaust gas. The compression ratio of the Miller cycle engine body can be fixed or adjustable. When the Miller cycle engine with fixed compression ratio is adopted, the supercharger is a supercharger with fixed flow, such as a roots pump or a rotor pump. When the supercharger with the fixed flow is adopted, the VTG turbine is connected with a crankshaft of the Miller cycle engine through a transmission. The efficiency of an internal combustion engine is remarkably improved.

Description

technical field [0001] The present invention relates to a kind of ultra-high supercharged turbocharged Miller cycle engine, which utilizes a larger turbine to increase the proportion of heat work absorbed from the exhaust gas, thereby improving thermal efficiency and forming a higher efficiency and high power AT Kingson cycle engine. Background technique [0002] Improvement in order to increase the thermal efficiency of internal combustion engines is the most important improvement design of internal combustion engines. The most commonly used Miller cycle engine can realize the Atkinson cycle with an expansion ratio of more than 1, and it is mass-produced and the technology is mature, which can fully expand the high-temperature gas to improve thermal efficiency. [0003] However, the power density of the Miller cycle is very low, even lower than that of a naturally aspirated four-stroke engine, so its power density needs to be greatly increased. The centrifugal supercharge...

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Problems solved by technology

[0004] The publication number is CN101092893A high supercharged Miller cycle engine and its control method. Although the supercharger is used to supercharge the Miller cycle engine, the result of the supercharging is that the pressure of the exhaust also increases, and the loss in the exhaust process The heat work also increases, so the efficiency decreases, which is actually equivalent to a four-stroke internal combustion engine, so the Miller cycle engine cannot increase power and maintain high efficiency through simple supercharging

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