New loop optimization method of non-supercharged high-efficiency energy-saving internal-combustion engine

A cycle optimization, high-efficiency and energy-saving technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unreasonable cycles of internal combustion engines, achieve the effects of increasing specific power, reducing exhaust loss, and reducing fuel consumption

Inactive Publication Date: 2009-10-21
广东大华仁盛科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to aim at the shortcoming that existing internal combustion engine cycle is unreasonable, propose a kind of optimization meth

Method used

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  • New loop optimization method of non-supercharged high-efficiency energy-saving internal-combustion engine
  • New loop optimization method of non-supercharged high-efficiency energy-saving internal-combustion engine
  • New loop optimization method of non-supercharged high-efficiency energy-saving internal-combustion engine

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Effect test

Embodiment 1

[0036] For a newly designed engine, the optimal compression ratio can be determined according to formula (2), where the variable index n 1 and n 2 It can be selected according to the empirical data of engines with similar performance, the temperature T of the starting point of working fluid compression 1v and the maximum gas temperature T 4 It can be determined according to the calculation method introduced in the relevant materials of "internal combustion engine", the value of the pressure rise ratio λ is selected between 1.25-2.2, and the thermodynamic parameters (c p , c v , k), you can refer to the book "Table of Thermophysical Properties of Liquids and Gases" edited by the inventor (Science Press, published in 1982).

Embodiment 2

[0038] For the existing internal combustion engine, its performance parameters can also be improved by changing the opening and closing angles of the intake and exhaust valves of the internal combustion engine so that the expansion ratio of the working medium is greater than the compression ratio in the variable process.

[0039] The specific method can be: reduce the exhaust valve opening angle γ in advance, and the minimum value of the γ value must ensure the pressure P of the gas at the end of expansion 5 and outside atmospheric pressure P a The ratio of should be slightly greater than or equal to the critical pressure ratio:

[0040] p 5 p a ≥ ( 2 k g + 1 ) ...

Embodiment 3

[0046] A single-cylinder engine has a bore of 100mm, a stroke of 115mm, a rated speed of 2200rpm, a rated power of 11.3kW, a fuel consumption rate of 245g / kW·h, a compression ratio of 17.5, an exhaust temperature of 873K, the intake valve opening angle α and exhaust The delayed closing angle δ of the valve is 15°CA, the delayed closing angle β of the intake valve and the early opening angle γ of the exhaust valve are both 43°CA. According to the theory of this patent, after reducing the γ angle to 20°CA, the fuel consumption rate of the engine can be reduced by 3%.

[0047]The invention overcomes the shortcoming that the expansion ratio of the high-temperature and high-pressure gas of the existing internal combustion engine is equal to the compression ratio of the low-temperature and low-pressure air, and it can make the high-temperature and high-pressure gas fully expand in the cylinder, thereby reducing the exhaust loss and greatly improving the working efficiency. The speci...

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Abstract

The invention relates to a new loop optimization method of a non-supercharged high-efficiency energy-saving internal-combustion engine, aiming at leading the expansion ratio in the polytropic process of working substance of the internal-combustion engine to be higher than the compression ratio thereof. The method overcomes the defect that the expansion ratio of high temperature and high pressure gas of the internal-combustion engine is equal to the compression ratio of low temperature and low pressure air. The method ensures the high temperature and high pressure gas is most fully expanded in an air cylinder, thus reducing the exhaust loss. Meanwhile, a mathematical analytic method is adopted to determine the corresponding optimum compression ratio when circulating power is maximum value, thus greatly improving the specific work (that is the work done by unit mass working substance) of working substance and reducing fuel consumption rate.

Description

technical field [0001] The invention relates to the field of high-efficiency energy-saving cycle optimization design of internal combustion engines, in particular to a new cycle optimization method for non-supercharged high-efficiency energy-saving internal combustion engines. Background technique [0002] The internal combustion engine cycle generally has four strokes: intake stroke, compression stroke, combustion and expansion power stroke, and exhaust stroke. Their common disadvantage is that the heat removal process is carried out in a state close to constant volume. Since the gas is not fully expanded in the cylinder, the discharged gas still has a certain pressure and high temperature, resulting in a large energy loss. It is one of the important reasons why the energy utilization rate of the non-supercharged internal combustion engine is not high. The use of technologies such as exhaust gas turbocharging can obviously increase the power of the engine and improve the e...

Claims

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Application Information

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IPC IPC(8): F01L13/00
Inventor 王丰
Owner 广东大华仁盛科技集团有限公司
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