Air valve lift range parameter design method of four-stroke gasoline engine power cycle

A technology of power cycle and valve lift, applied in mechanical equipment, machines/engines, engine components, etc., can solve problems such as large pumping loss, achieve high expansion ratio, and improve cycle thermal efficiency

Inactive Publication Date: 2013-12-04
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology

Therefore, there is a large pumping loss at small loads

Method used

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  • Air valve lift range parameter design method of four-stroke gasoline engine power cycle

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing.

[0028] see figure 1 , "intake valve lift-A" indicates the most retarded position of the intake valve lift, which is also the initial position of the intake valve lift mentioned in the present invention. "Intake valve lift-B" indicates the most advanced position of the intake valve. "Exhaust valve lift-A" indicates the most advanced position of the exhaust valve lift, which is also the initial position of the exhaust valve lift mentioned in the present invention.

[0029] The exhaust valve lift is close to the position of "exhaust valve lift-B" and the intake valve lift is close to the position of "intake valve lift-A" under light load, so as to improve the thermal efficiency of the cycle. As the load increases, the exhaust valve lift moves from "exhaust valve lift-B" to "exhaust valve lift-A", and the intake valve lift moves from "intake valve lift-A" to " Intak...

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Abstract

The invention relates to an air valve lift range parameter design method of a four-stroke gasoline engine power cycle for realizing the effect that the expansion ratio is greater than the compression ratio. The parameters comprise the air valve maximum lift range, persistent period (the persistent period refers to the crank shaft rotating angle from the opening point to the closing point, and is expressed by degree CA) parameters and air valve phase parameters. Through the phase regulation on the air inlet valve lift range adopting the parameter design, the air inlet valve closing moment is controlled, the effective compression ratio change in a large range is realized, the effect that the expansion ratio is greater than the compression ratio is realized, a higher gasoline engine geometry compression ratio is matched, the cycle heat efficiency of a gasoline engine can be further improved, meanwhile, the pump gas loss is greatly reduced, and in addition, a knocking inhibition effect is realized in outer characteristic aspects.

Description

technical field [0001] The invention relates to the selection of engine power cycle combustion system parameters and the specific design of the gas distribution mechanism. Background technique [0002] The gasoline engine with a conventional power cycle has little difference between the expansion ratio and the compression ratio, and the geometric compression ratio is generally not high due to the limitation of knocking, so the gas is not fully expanded to do work after combustion, so it is excluded from the cylinder, which is equivalent to Energy is wasted due to expansion ratio limitations. But to increase the expansion ratio, the geometric compression ratio must be increased, and the knocking tendency will be greatly increased, and the conventional valve lift cannot be used for a gasoline engine with a high compression ratio. [0003] In order to make the engine ventilation process more perfect to obtain greater intake efficiency, thereby obtaining greater torque output, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D13/00F02D15/00F01L1/344
Inventor 蒲运平聂相虹张小燕周通胡铁刚曾寒
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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