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Engine with compression ratio capable of being changed

A compression ratio, engine technology, applied in engine control, machine/engine, mechanical control, etc., can solve the problems of low combustion efficiency, difficult to meet the development requirements of supercharged engines, achieve simple structure and control, and save fuel consumption , the effect of increasing strength

Active Publication Date: 2017-07-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this low compression ratio design will cause the engine to have very low combustion efficiency when the supercharger (especially the turbocharger) is not fully involved, and the power that can be generated is higher than that generated by an ordinary naturally aspirated engine. much less
Fixed compression ratio engines have been difficult to meet the development requirements of supercharged engines

Method used

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  • Engine with compression ratio capable of being changed
  • Engine with compression ratio capable of being changed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The specific working process of the variable compression ratio engine described in Embodiment 1 is as follows:

[0059] When the engine needs to change the compression ratio, the self-locking motor is controlled to rotate at a certain angle, and the self-locking motor drives the disc gear 105 to rotate at a certain angle through a transmission mechanism after decelerating and increasing twist at a certain gear ratio. After the disc gear 105 rotates a certain angle, the positions of the highest point and the lowest point of the elliptical groove 106 on the disc gear change accordingly, thereby changing the positions of the top dead center and the bottom dead center of the engine piston 102 to achieve a change in engine compression. than the purpose. When the highest point and the lowest point of the elliptical groove 106 on the disk gear 105 are on the long axis of the ellipse, the piston stroke is the largest, the volume of the combustion chamber is the smallest, the en...

Embodiment 2

[0065] The specific working process of the variable compression ratio engine described in Embodiment 2 is as follows:

[0066] When the engine needs to change the compression ratio, the control actuator drives the transmission shaft 217 to rotate a certain angle, and the transmission shaft drives the disc 205 to move up and down a certain distance through the double-rod mechanism 213 . The top dead center and bottom dead center positions of the piston 202 are determined by the highest and lowest points of the circular groove 206 on the disc 205. When the disc 205 moves up and down for a certain distance, the distance between the top dead center and the bottom dead center of the piston changes accordingly. Since the diameter of the circular groove 206 on the disk does not change during the up and down movement of the disk 205, the distance between the highest point and the lowest point of the circular groove does not change, so during the up and down movement of the disk, The s...

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PUM

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Abstract

The invention discloses an engine with a compression ratio capable of being changed. The engine comprises a crank case, multiple sets of changeable crankshaft and a crankshaft arm adjusting device, and the crankshaft arm adjusting device comprises a rotating shaft and multiple gears, wherein the rotating shaft is rotatably supported in the crank case, one end of the rotating shaft is provided with a locking device, the gears are fixedly arranged on the rotating shaft, and the gears are meshed with disc gears and can drive the disc gears to rotate; that is to say, the length of a crankshaft arm of the engine can be changed, the compression ratio of the engine can be changed by changing the length of the crankshaft arm, and therefore power performance and economical efficiency of the engine are effectively improved.

Description

technical field [0001] The invention relates to the field of engines, in particular to an engine with variable crank arm length and variable compression ratio. Background technique [0002] For traditional engines, appropriately increasing the engine compression ratio can not only increase the power output of the engine, but also reduce the fuel consumption of the engine. Improving the engine compression ratio has become a popular direction for engine development. For example, the current mass-produced gasoline engine has a compression ratio of up to 14:1. However, the compression ratio of the engine is not as high as possible. The compression ratio directly determines the maximum pressure of the combustible gas mixed in the engine combustion chamber. The combustion characteristics of gasoline lead to the pressure of the combustible gas mixed in the combustion chamber not being too high. If the pressure in the cylinder exceeds the critical value, gasoline will be ignited du...

Claims

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Application Information

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IPC IPC(8): F02D15/04F02B75/04
CPCF02B75/048F02D15/04F02D2700/03Y02T10/12
Inventor 王军年王岩王治强王庆年张垚
Owner JILIN UNIV
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