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Butterfly valve egr control method for natural gas engine

A control method and engine technology, applied in engine control, electrical control, machine/engine, etc., can solve the problems of worsening emissions and economy, large transient deviation of EGR rate, slow correction, etc., to achieve full combustion and high-standard emissions The effect of indicators

Active Publication Date: 2019-05-03
WEICHAI XIGANG NEW ENERGY POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen from this that since the fluid characteristics of the butterfly valve throttle valve are not linear, this control method has the disadvantages of large transient deviation of EGR rate and slow correction during operation, which may deteriorate emissions and economy

Method used

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  • Butterfly valve egr control method for natural gas engine
  • Butterfly valve egr control method for natural gas engine
  • Butterfly valve egr control method for natural gas engine

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0022] The butterfly valve EGR control method for natural gas engines, the basic control principle is: the inner small closed-loop control is performed using the EGR valve demand opening as the feedback signal, and the outer large closed-loop control is performed using the EGR rate demand value as the feedback signal, so as to precisely control the EGR through EGR. Valve exhaust flow.

[0023] refer to figure 2 ,Speci...

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Abstract

The invention discloses a butterfly valve type EGR control method for a natural gas engine. The method uses the demand opening degree of an EGR valve as a feedback signal to conduct inner layer small closed-loop control, and EGR rate demand value is used as the feedback signal to conduct outer layer large closed-loop control, so that the exhaust gas flow penetrating through the EGR valve is precisely controlled. In actual calibration or operation, control of the exhaust gas flow, especially the transient control, can be relatively accurate through the accurate closed-loop of the EGR rate and control and response of EGR valve opening closed-loop, so that more sufficient burning and high-level emission targets are ensured.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a butterfly valve EGR control method for a natural gas engine. Background technique [0002] As urban environmental pollution becomes more and more serious, the government has higher and higher requirements on engine emissions. Euro VI emission limits have been determined, and the promotion of Euro VI is inevitable. Natural gas engine Euro VI system can adopt lean burn and equivalent combustion, but the cost of lean burn is high, the durability is weak, and the disadvantages are obvious; while the heat load of equivalent combustion is relatively large, in order to reduce NOx emissions, the engine will introduce exhaust gas recirculation technology, that is, EGR technology . [0003] The currently used EGR valve is a butterfly valve throttle valve. For vehicle engines, under normal circumstances, the pedal is the most important source of demand, so the source of calcu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D21/08F02D41/14
CPCF02D41/0027F02D41/0052F02D41/0072F02D41/0077F02D41/1402F02D2021/083F02D2041/1409F02D2200/1002F02D2200/602
Inventor 石亮刘锡庆周凯
Owner WEICHAI XIGANG NEW ENERGY POWER
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