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Method and system for calculating target EGR rate

A calculation method and target technology, applied in the calculation method and system field of the target EGR rate, can solve the problems of large calculation result error and complicated calculation process, and achieve the effect of supporting EGR control

Active Publication Date: 2021-03-09
DONGFENG MOTOR CORP HUBEI
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Problems solved by technology

The calculation of the target EGR rate in EGR control is a very important part, which directly determines whether the high-pressure EGR control can be accurate and effective. However, the current conventional target EGR rate calculation process is complicated and the calculation results have large errors

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  • Method and system for calculating target EGR rate
  • Method and system for calculating target EGR rate

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Embodiment Construction

[0047] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0048] The technical solution of the present invention is a calculation method of a target EGR rate, such as figure 1 shown, including the following steps:

[0049] S1. Determine the basic target EGR rate r according to the engine speed and load EGRDesrdMapped ;

[0050] S2. Obtain the corresponding correction rate according to the special working conditions;

[0051]S3. Determine the initial target EGR rate r according to the basic target EGR rate and each correction rate EGRDesrdRaw ;

[0052] S4, judging whether the EGR is activated according to the E...

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Abstract

The invention discloses a method for calculating a target EGR rate. The method comprises the following steps that a basic target EGR rate is determined according to the rotating speed and the load ofan engine; a corresponding correction rate is obtained according to the special working condition; an initial target EGR rate is determined according to the basic target EGR rate and each correction rate; whether EGR is activated or not is judged according to the EGR activation state condition; and EGR states are divided according to a judgment result, and the final target EGR rate is determined.The initial target EGR rate is calculated from the throttle opening degree, the manifold pressure difference and the minimum ignition angle, the target EGR rate can be accurately calculated, EGR control activation conditions are introduced, secondary correction is carried out on the final target EGR rate, the accurate target EGR rate can be obtained, and later-period accurate EGR control is effectively supported.

Description

technical field [0001] The invention relates to the field of engine exhaust gas recirculation rate control, in particular to a calculation method and system for a target EGR rate. Background technique [0002] With the rapid development of the automobile and internal combustion engine industries, energy demand and environmental protection issues have become difficult problems faced by countries all over the world. Therefore, energy saving and emission reduction have become two major themes in the development of the internal combustion engine industry. In terms of energy saving, domestic and foreign automobile manufacturers use: Otto cycle, Atkinson cycle, Miller cycle, high-pressure exhaust gas recirculation (Exhaust Gas Recirculation, EGR) or low-pressure high-pressure exhaust gas recirculation Cycle and other technologies can improve the combustion and work process of the engine, or through the miniaturization design of the engine, the pumping loss of small and medium load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02M26/20F02M26/47
CPCF02D41/0072F02D41/005F02D41/0055F02M26/20F02M26/47
Inventor 秦龙郑建波张凡武房体友
Owner DONGFENG MOTOR CORP HUBEI