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A control method and system for egr and vtg

A technology of EGR valve and control command, applied in the field of EGR and VTG control method and system, can solve the problems of EGR and VTG control disorder, increase and increase of fresh intake air, etc., and achieve the improvement of control stability and responsiveness. Effect

Active Publication Date: 2018-10-16
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Backflow will lead to an increase in fresh air intake, and the deviation AirCtl_mAct between the air intake set value AirCtl_mDes and the actual value will continue to increase, resulting in EGR and VTG control disorder problems

Method used

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  • A control method and system for egr and vtg
  • A control method and system for egr and vtg
  • A control method and system for egr and vtg

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Embodiment Construction

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0049] figure 2 A schematic flow chart of a control method for EGR and VTG proposed by an embodiment of the present invention, refer to figure 2 , the control method of EGR and VTG, including:

[0050] 210. The electronic control unit ECU acquires the driving pressure difference between the post-boost pressure P2 of the engine to be contr...

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Abstract

The invention discloses a control method and a system for EGR and VTG (variable turbine geometry). The control method for the EGR and the VTG comprises the following steps: obtaining drive pressure difference of a to-be-controlled engine gas inlet tube and a gas exhaust tube; when the drive pressure difference is negative pressure difference, generating an EGR control instruction and a VTG control instruction according to the negative pressure difference; sending the EGR control instruction to the EGR for controlling opening degree of the EGR valve by the EGR according to the EGR control instruction; sending the VTG control instruction to the VTG for controlling the VTG opening degree by the VTG according to the VTG control instruction. According to the control method, the control strategy of the EGR and the VTG is corrected by virtue of the drive pressure difference, so that the problem that the control on the EGR and the VTG is in disorder when the drive pressure difference is a negative value is avoided, and therefore, the control stability and the control responsiveness are improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an EGR and VTG control method and system. Background technique [0002] For Euro VI engines, the technical route of EGR+SCR+DPF is adopted to meet the emission requirements. In order to meet the requirements of EGR rate and air-fuel ratio under different working conditions, VTG (variable cross-section supercharger) is required to realize EGR driving capability. At the same time to meet the best fuel consumption. In the existing scheme, the control of VTG adopts closed-loop control based on the pressure after supercharging, and the closed-loop control of fresh inflow is adopted for EGR. [0003] figure 1 It is a schematic configuration diagram of the engine in a control method of EGR and VTG proposed by an embodiment of the present invention, refer to figure 1 , if the required EGR rate is to be achieved, the pre-vortex pressure P3 needs to be greater than the post-boost pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02B37/24F02D23/00F02D21/08
CPCF02B37/24F02D21/08F02D23/00F02D37/00F02D41/0077F02D2021/083F02D2200/04F02D2200/0614F02D2200/101Y02T10/12
Inventor 代子阳栾军山姚旺张广西钟跃兰
Owner WEICHAI POWER CO LTD
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