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On-line detection method of non-uniformity of each cylinder of diesel engine based on instantaneous speed

A technology of instantaneous speed and detection method, applied in mechanical equipment, engine components, machines/engines, etc., to achieve strong theoretical guidance and universal applicability

Active Publication Date: 2021-11-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides an online non-uniformity detection method for each cylinder of a diesel engine based on instantaneous rotational speed, to solve the problem of detecting whether each cylinder of a diesel engine is working uniformly

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  • On-line detection method of non-uniformity of each cylinder of diesel engine based on instantaneous speed
  • On-line detection method of non-uniformity of each cylinder of diesel engine based on instantaneous speed
  • On-line detection method of non-uniformity of each cylinder of diesel engine based on instantaneous speed

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Embodiment Construction

[0045] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0047] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

[0048] In all examples shown and discussed herein, any specific values ​​should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have dif...

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Abstract

The invention discloses an on-line detection method for the inhomogeneity of each cylinder of a diesel engine based on an instantaneous rotational speed, and relates to the technical field of electronic control of a diesel engine. The method includes collecting a plurality of first instantaneous rotational speeds of the crankshaft in the cylinder during the operation of the diesel engine, and performing data processing on them to obtain at least one second instantaneous rotational speed; calculating the moment of inertia of the crankshaft of the diesel engine within one cycle, and calculating Average moment of inertia, calculate the equivalent rotational speed of the diesel engine in one cycle, obtain the waveform diagram of the equivalent rotational speed of the diesel engine in one cycle, calculate the amount of work done by any cylinder in the expansion stage in one cycle, and calculate the unevenness coefficient of each cylinder; compare The absolute value of the non-uniformity coefficient and the size of the preset threshold can judge online whether the cylinder in the diesel engine is in a uniform working state; the detection cost is reduced, and the calculation and judgment of whether the cylinder is in a uniform working state is carried out based on the theory of equivalent speed , with stronger theoretical guidance and universality.

Description

technical field [0001] The invention relates to the technical field of electronic control of diesel engines, and more particularly relates to an online detection method for non-uniformity of each cylinder of a diesel engine based on instantaneous rotational speed. Background technique [0002] The unevenness of the combustion process of a multi-cylinder diesel engine seriously affects the uniformity of the work of each cylinder. The unevenness of each cylinder of a diesel engine not only has a major impact on its power and economy, but also has a great impact on its emission performance. With the increasingly stringent emission regulations, the research on the uniformity of diesel engine work is of great significance to reduce diesel engine emissions. [0003] The working process of the multi-cylinder diesel engine using the unit pump fuel injection system will be affected by factors such as processing consistency and use loss, which will directly or indirectly lead to uneve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B77/08
CPCF02B77/08F02B77/085
Inventor 崔涛王天翔李佳薇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY