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Design method of bimodal cam with exhaust gas recirculation function of diesel engine

A technology of exhaust gas recirculation and design method, applied in valve details, valve drive devices, etc., can solve problems such as unreported

Inactive Publication Date: 2015-10-28
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has not been a detailed introduction of the specific implementation method of the exhaust gas rebreathing IEGR technology at home and abroad, let alone the relevant reports on the implementation of this technology.

Method used

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  • Design method of bimodal cam with exhaust gas recirculation function of diesel engine
  • Design method of bimodal cam with exhaust gas recirculation function of diesel engine
  • Design method of bimodal cam with exhaust gas recirculation function of diesel engine

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Embodiment Construction

[0140] The present invention is described in detail below in conjunction with accompanying drawing and embodiment, but present embodiment can not be used for limiting the present invention, and every similar method and similar variation thereof that adopt the present invention all should be included in the protection scope of the present invention.

[0141] Design example of bimodal cam profile with diesel exhaust gas recirculation function:

[0142] The initial condition parameters of the curve design are shown in Table 1.

[0143] Table 1 Curve design parameters

[0144]

[0145] In order to simplify the calculation, when calculating the profile of each segment, the starting point of the cam rotation angle is set to zero, and finally the result can be translated to obtain the profile of the entire double-peak cam.

[0146] 1. Calculation of the main buffer segment

[0147] From the initial conditions:

[0148] alpha 1 = 24°

[0149] h 1 =0.438453mm

[0150] v 1 =0...

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Abstract

The invention relates to a method for designing a two-peak cam with a waste gas recycling function of a diesel engine, which comprises the following steps: firstly, sectionally establishing six equations of cam tappet lift curves h (alpha) of a buffer ascending section, a working section and a buffer descending section of a main cam, a main and auxiliary cam connecting section, a working section and a buffer descending section of an auxiliary cam and the like and obtaining an undetermined coefficient of each equation; and then substituting the undetermined coefficients into the established mathematical equations to obtain a two-peak cam molded line with the waste gas recycling function of the diesel engine, wherein the main and auxiliary buffer sections adopt the uniform acceleration-uniform speed type equation design; the working sections of the main and auxiliary cams adopt the higher-order pentanomial equation design; and the connecting section adopts the sextic seven-term equation design. By the method, the moment that waste gas generated by the engine reenters a cylinder and the entry volume of the waste gas can be accurately and flexibly controlled according to the requirements of a designer, so that a mixing ratio of fresh air and the waste gas in the cylinder is controlled, the combustion conditions in the cylinder are improved and the optimal coordination of performance of the diesel engine and the NOx discharge is achieved.

Description

technical field [0001] The invention relates to a design method for a double-peak cam with the exhaust gas recirculation function of a diesel engine, and belongs to the technical field of diesel engine emission reduction. Background technique [0002] Diesel engine exhaust gas recirculation (Exhaust Gas Recirculation, EGR) technology is one of the most effective and reliable emission reduction technology methods in today's diesel engine internal purification technology. The technical method is to introduce a part of the exhaust gas into the cylinder or reduce the exhaust gas discharge, so that the burned exhaust gas can participate in the combustion of the next working cycle again. When the exhaust gas is mixed with fresh air, the composition of the mixed gas in the cylinder changes, due to the inert gas (CO) contained in the exhaust gas 2 , N 2 etc.) have the characteristics of high specific heat, which will reduce the combustion temperature of gas in the cylinder, and ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/08
Inventor 褚超美钱常杰王成润杜玉昊周进洪佳骏奚成捷
Owner UNIV OF SHANGHAI FOR SCI & TECH
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