An internal combustion engine platform for increased thermal efficiency, constant-volume combustion, variable compression ratio, and cold start

2011 ◽  
Vol 36 (5) ◽  
pp. 682-690
Author(s):  
Yiding Cao
Keyword(s):  
Internal Combustion Engine ◽  
Compression Ratio ◽  
Thermal Efficiency ◽  
Combustion Engine ◽  
Cold Start ◽  
Internal Combustion ◽  
Constant Volume ◽  
Variable Compression Ratio ◽  
Constant Volume Combustion ◽  
Variable Compression

Using Geared Mechanisms to Increase the Thermal Efficiency of Conventional IC-Engines

1994 ◽  
Author(s):  
David N. Rocheleau
Keyword(s):  
Internal Combustion Engine ◽  
Thermal Efficiency ◽  
Atmospheric Pressure ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Constant Volume ◽  
Power Stroke ◽  
Stroke Length ◽  
Constant Volume Combustion ◽  
Ic Engines

Abstract Two different geared mechanisms are examined as an alternative to the conventional crank-slider mechanism that is used for the 4-stroke internal combustion engine. The purpose of these geared mechanisms is to provide variable-stroke length and constant-volume combustion. The variable-stroke length feature gives a power stroke which is two to three times longer than the compression stroke, which allows additional work to be extracted as the gas expands to nearly atmospheric pressure. The constant-volume combustion feature prevents the dissipation of compressive work during ignition. The combination of these two features leads to theoretical thermal efficiency gains of up to 45% over the standard fixed-stroke length Otto-cycle internal combustion engine.

scholarly journals Temperature, Heat Distribution and Performance Analysis in a Variable Compression Ratio Internal Combustion Engine

2020 ◽  
Vol 8 (5) ◽  
pp. 4825-4829
Keyword(s):  
Heat Loss ◽  
Compression Ratio ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Mechanical Energy ◽  
Cooling Water ◽  
Internal Combustion ◽  
Heat Distribution ◽  
Variable Compression Ratio ◽  
Variable Compression

The internal combustion engines are also known as heat engines because of the utilization of heat energy of the fuel to convert it in to mechanical energy of the engine which finally runs the vehicle. Therefore, it is necessary to examine the generation and utilization of heat inside and outside the engine. For the above mentioned purpose, a variable compression ratio engine was used to perform experiment. The heat distribution of the used engine was investigated to recognize the heat loss areas from the engine. The experiments were performed by changing compression ratio from 15 to 21 and an optimum compression ratio was found. The experiments are further extended to find an optimum load value at standard compression ratio of the engine. The analysis was performed by using various factor of heat utilization such as heat supplied by fuel, heat equivalent to brake power, heat loss to exhaust gases, heat loss to engine cooling water and heat unaccounted. The proposed research will be useful to overcome the challenges during selection of compression ratio for design of an engine in industries.

Effects of Compression Ratio on Performance and Emission of Internal Combustion Engine with Used Vegetable Oil Methyl Easter

2013 ◽  
Vol 768 ◽  
pp. 250-254
Author(s):  
N. Balakrishnan ◽  
K. Mayilsamy ◽  
N. Nedunchezhian
Keyword(s):  
Internal Combustion Engine ◽  
Vegetable Oil ◽  
Compression Ratio ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Maximum Pressure ◽  
Base Line ◽  
Promising Alternative ◽  
Performance And Emission ◽  
Used Vegetable Oil

Biomass derived vegetable oil is a promising alternative fuel for an internal combustion engine. Direct use of vegetable oil has inferior performance with higher emission due to its higher viscous in nature. This can be overcome by transesterification process with its byproduct which is called as used vegetable oil methyl ester. While blending this biodiesel with fossil diesel upto maximum of 30:70, will give the higher performance and lower emission than the fossil diesel alone. In this present study biodiesel in the form of B23 is used in a four stroke water cooled variable compression ratio engine without any modifications. The performance and emission characteristics are studied with different compression ratio and compared with a base line fossil diesel mode operation. This study reveals that the compression ratio of 18 is the optimum in the view of ignition delay, maximum pressure crank angle, exhaust gas temperature and Smoke emission.

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