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A Method for Determining Working Compression Ratio of Reciprocating Internal Combustion Engine

A compression ratio, internal combustion engine technology, applied in mechanical equipment, engine control, machine/engine, etc., to achieve the effect of improving thermal efficiency

Active Publication Date: 2022-05-03
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a method for determining the working compression ratio of a reciprocating internal combustion engine to solve the problem that the working compression ratio of the existing internal combustion engine needs to be determined only by experience

Method used

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  • A Method for Determining Working Compression Ratio of Reciprocating Internal Combustion Engine
  • A Method for Determining Working Compression Ratio of Reciprocating Internal Combustion Engine
  • A Method for Determining Working Compression Ratio of Reciprocating Internal Combustion Engine

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Embodiment 1

[0043] Embodiment 1: the method for determining the working compression ratio of an Otto cycle internal combustion engine comprises the following steps:

[0044] 1.1 Determine the temperature of the working fluid at the start of compression and the maximum temperature of the working fluid after heat absorption in the Otto cycle

[0045] The expression for the thermal efficiency of an ideal Otto cycle is:

[0046]

[0047] where κ is the specific heat ratio of the working fluid, is the cycle compression ratio and each temperature is in Kelvin.

[0048] The temperature of each state point in the Otto cycle is expressed as:

[0049]

[0050] T 3 =T 1 τ (3)

[0051]

[0052] It can be seen from formula (1) that increasing the compression ratio can improve the theoretical thermal efficiency of the Otto cycle. Depend on figure 1 , 2 It can be seen that when the temperatures at points 1 and 3 (the lowest cycle temperature and the highest working temperature) are deter...

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Abstract

The present invention relates to the technical field of internal combustion engines, in particular to a method for determining the working compression ratio of a reciprocating internal combustion engine, comprising the following steps: determining the working temperature limit of the gas power cycle; determining the target compression ratio according to the working temperature limit, and using the target compression ratio as the reciprocating The working compression ratio of the type internal combustion engine; wherein, the target compression ratio is the compression ratio corresponding to the gas power cycle when the cycle specific work is the largest or the average effective pressure of the cycle is the largest. The method for determining the working compression ratio of the reciprocating internal combustion engine proposed by the invention solves the problem that the working compression ratio of the existing internal combustion engine needs to be determined only by experience.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a method for determining the working compression ratio of a reciprocating internal combustion engine. Background technique [0002] Reciprocating internal combustion engines for mobile tools, such as Otto internal combustion engines (reciprocating internal combustion engines whose theoretical cycle is the Otto cycle), have a long history. Taking the Otto internal combustion engine as an example, its ideal working cycle is the Otto cycle (Otto cycle), which is one of several gas power cycles. In terms of thermodynamic performance analysis of gas power cycle performance, ideal gasoline engine cycle (Otto cycle, or Otto cycle), diesel engine Diesel cycle (Diesel cycle, or Diesel cycle), diesel engine mixed heating cycle (Sabathe cycle, Sabah Cycle) and gas turbine plant cycle (Brayton cycle, or Brayton cycle), cycle performance indicators (such as thermal effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D15/00
CPCF02D15/00
Inventor 何頔段志鹏何伯述王超俊
Owner BEIJING JIAOTONG UNIV
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