Early closing miller cycle internal combustion engine

a technology of internal combustion engine and miller cycle, which is applied in the direction of machines/engines, non-mechanical valves, output power, etc., can solve the problems of large impact due to momentum of valves, decreased flexibility of valve design, and likely decrease of durability of valves, so as to reduce flexibility of valve design and reduce the effect of valve durability
US20020026913A1Inactive Publication Date: 2002-03-07NISSAN MOTOR CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
NISSAN MOTOR CO LTD
Publication Date
2002-03-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention mitigates restriction due to the fact that the opening period (angular working range) of the intake valve becomes smaller in the early closing Miller cycle operation, in which the intake valve closing timing occurs before the bottom dead center. The crankshaft center O1 is offset on one side from the cylinder central axis X. The top dead center and the bottom dead center of the piston occur when the three points, namely the crankshaft center O1, the crankpin center O2, and the piston pin center O3 are aligned in one line. At this time, the connecting rod and the crank arm are inclined relative to the axis X. The inclination angle .theta..sub.bdc at the bottom dead center is greater than the inclination angle .theta..sub.tdc at the top dead center. Therefore, as the crankshaft rotates in the direction of arrow .omega., the intake process and the expansion process become greater than 180.degree. CA, while the compression process and the exhaust process become smaller than 180.degree. crank angle. Accordingly, the angular working range of the intake valve is enlarged. Therefore, the restriction to the valve lift curve is mitigated.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention generally relates to an early closing Miller cycle internal combustion engine. More specifically, the present invention relates an early closing Miller cycle internal combustion engine, in which Miller cycle is achieved by advancing the angular timing of the closing of an intake valve relative to the intake bottom dead center.

[0003] 2. Background Information

[0004] A Miller cycle internal combustion engine has a greater expansion rate than compression rate in order to improve the fuel consumption rate. Thus, the Miller cycle internal combustion engine has recently been drawing more interest in the automotive field. Miller cycle internal combustion engines are broadly divided into late closing Miller cycle engines and early closing Miller cycle engines. In the late closing Miller cycle engines, the intake valve closing timing is delayed relative to the intake bottom dead center, such that the air t...

Claims

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