Method for implementing increment of expansion ratio of reciprocating intermal-combustion engine and control of compression ratio

A technology of expansion ratio and compression ratio, applied in the field of internal combustion engines, can solve the problems of too large internal combustion engine, subject to compression ratio, low thermal efficiency, etc., and achieve the effect of increasing thermal power conversion and small improvement.

Inactive Publication Date: 2005-11-16
缪波
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  • Application Information

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Problems solved by technology

At present, the thermal efficiency of reciprocating internal combustion engines used in large quantities is relatively low, so it is particularly important to improve the economic performance of internal combustion engines
The work expansion ratio of the current four-stroke internal combustion engine is equal to the compression ratio. After the work is done, the working medium still has a certain pressure. At this time, the working medium still has the ability to work externally. By increasing the expansion ratio, more heat conversion can be realized, but Excessive compression ratio makes the internal combustion engine unable to work normally, and the expansion ratio is limited by the compression ratio. This part of heat conversion is not realized, but is discharged from the cylinder

Method used

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  • Method for implementing increment of expansion ratio of reciprocating intermal-combustion engine and control of compression ratio
  • Method for implementing increment of expansion ratio of reciprocating intermal-combustion engine and control of compression ratio
  • Method for implementing increment of expansion ratio of reciprocating intermal-combustion engine and control of compression ratio

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Embodiment Construction

[0014] A gasoline engine is provided, the maximum volume V2 is 1.6 liters, the minimum volume V1 is 0.2 liters, compression ratio=expansion ratio=8, it is improved now: V1=0.2 liters, V2=3.4 liters, expansion ratio=17.

[0015] The way to control the compression ratio has one of the following measures: 1. Inhalation stroke, when the crank rotates through the top dead center at an angle of 90 degrees, when the cylinder volume V3=1.6 liters, the intake valve is closed, and the gas expands from V3 to V2, and then compresses to V1, the corresponding cam shape change is: in the intake stroke, the crank rotates to the top dead center, the intake cam rotates 45+ρ ​​degrees, ρ is the clearance compensation angle, and the contact point of the cam follower reaches the position of the base circle of the cam. The rest remain unchanged. 2. In the compression stroke, when the crank rotates past the bottom dead center at an angle of 90 degrees, when the cylinder volume is V3 = 1.6 liters, th...

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Abstract

The present invention discloses a method for increasing expansion ratio of reciprocating internal combustion engine and controlling its compression ratio. Said method utilizes the regulation of maximum volume V2 and minimum volume V1 of the cylinder to make the expansion ratio V2 / V1 be increased, and utilizes change of cam form and port timing of air inlet and outlet valves to make the effectively-compressed actuating meduim volume be V3, V1 less than V3 less than V2, the compression ratio is V3 / V1, so that it can target the goal of increasing engine thermal powder conversion.

Description

technical field [0001] The invention relates to an internal combustion engine, in particular to a method for increasing the expansion ratio of a reciprocating internal combustion engine and controlling the compression ratio. Background technique [0002] The internal combustion engine is regarded as the heart of the car, and the performance of the internal combustion engine determines the quality of the car. The thermal efficiency of reciprocating internal combustion engines widely used at present is relatively low, so it is particularly important to improve the economic performance of internal combustion engines. The work expansion ratio of the current four-stroke internal combustion engine is equal to the compression ratio. After the work is done, the working medium still has a certain pressure. At this time, the working medium still has the ability to work externally. By increasing the expansion ratio, more heat conversion can be realized, but Excessive compression ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B41/02
Inventor 缪波
Owner 缪波
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