Control method and device of exhaust gas recirculation control valve, vehicle and medium

A technology of exhaust gas recirculation and control method, which is applied in the direction of electrical control, engine control, fuel injection control, etc. It can solve the problems affecting the stability of EGR control, achieve stable control and avoid the effect of opening jump

Active Publication Date: 2021-08-24
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing exhaust gas recirculation control valve control, when the engine operating mode is switched, the EGR feed-forward value and the set mass flow rate will change suddenly, which will lead to a sudden change in the EGR opening calculated by the P controller (ie EGR mutation of the opening feedback value), the EGR opening feedforward value plus the EGR opening feedback value to obtain the final EGR setting opening, the EGR setting opening will inevitably undergo a mutation, thus affecting the stability of EGR control

Method used

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  • Control method and device of exhaust gas recirculation control valve, vehicle and medium
  • Control method and device of exhaust gas recirculation control valve, vehicle and medium
  • Control method and device of exhaust gas recirculation control valve, vehicle and medium

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Embodiment 1

[0043] figure 2It is a flow chart of a control method of an exhaust gas recirculation control valve provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation where the EGR opening is smoothly controlled when the engine operation mode is switched. This method can be controlled by the exhaust gas The control device of the recirculation control valve is implemented, and the control device of the exhaust gas recirculation control valve can be implemented in the form of software and / or hardware. The control method of the exhaust gas recirculation control valve specifically includes the following steps:

[0044] S110. When the engine operation mode is switched, acquire the EGR setting opening value of the last step of the EGR control valve, the current EGR feed-forward opening value, and the first EGR opening value corresponding to the P controller.

[0045] Among them, the engine operation mode includes multiple, according to different engi...

Embodiment 2

[0060] image 3 It is a flow chart of a control method for an exhaust gas recirculation control valve provided in Embodiment 2 of the present invention, and this embodiment is optimized on the basis of the foregoing embodiments.

[0061] Correspondingly, the method in this embodiment specifically includes:

[0062] S210. When the engine operation mode is switched, obtain the EGR set opening value of the last step, the current EGR feed-forward opening value, the current EGR set mass flow value and the current EGR actual mass flow value of the EGR control valve.

[0063] On the basis of the above embodiments, obtaining the current EGR feed-forward opening value of the exhaust gas recirculation control valve includes: obtaining the current engine operating mode and the current engine operating condition, and according to the current engine operating mode and the current engine operating condition Determine the current EGR feed-forward opening value of the exhaust gas recirculati...

Embodiment 3

[0078] Figure 4 It is a structural diagram of a control device for an exhaust gas recirculation control valve provided by Embodiment 3 of the present invention. This embodiment is applicable to the situation where the EGR opening is controlled smoothly when the engine operation mode is switched.

[0079] Such as Figure 4 As shown, the control device of the exhaust gas recirculation control valve includes: an opening value determination module 310, a second EGR opening value determination module 320, and a target EGR setting opening value determination module 330, wherein:

[0080] The opening value determination module 310 is used to obtain the EGR set opening value of the last step of the EGR control valve, the current EGR feed-forward opening value and the first EGR corresponding to the P controller when the engine operating mode is switched. opening value;

[0081] The second EGR opening value determination module 320 is used to determine the first EGR opening value corre...

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Abstract

The embodiment of the invention discloses a control method and device of an exhaust gas recirculation control valve, a vehicle, and a medium. The control method of the exhaust gas recirculation control valve comprises the steps that when the operation mode of an engine is switched, an EGR set opening value of the last step length of the exhaust gas recirculation control valve, a current EGR feed-forward opening value and a first EGR opening value corresponding to a P controller are obtained; according to the EGR set opening value of the last step length, the current EGR feed-forward opening value and the first EGR opening value, a second EGR opening value corresponding to an I controller is determined; a current EGR feedback opening value is determined according to the first EGR opening value and the second EGR opening value, a target EGR set opening value is determined according to the current EGR feed-forward opening value and the current EGR feedback opening value, and the target EGR set opening value is equal to the EGR set opening value of the last step length.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of engine control, and in particular to a control method, device, vehicle and medium of an exhaust gas recirculation control valve. Background technique [0002] With the upgrading of emission regulations, the exhaust gas recirculation control valve (Exhaust Gas Recirculation, referred to as EGR), as an important part of emission control, has been widely valued in the engine. EGR reduces NOx emissions by introducing exhaust gas into the intake pipe, reducing the oxygen content and combustion temperature in the intake air. [0003] At present, the exhaust gas recirculation control valve mainly has two control routes: Venturi and air flow sensor MAF during engine operation. Both methods realize the control of the exhaust gas recirculation control valve through the idea of ​​feedforward and PID. Among them, in the Venturi route, the set EGR opening degree is obtained through the PID b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D21/08
CPCF02D41/0077Y02T10/40
Inventor 张红倩江楠
Owner WEICHAI POWER CO LTD
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