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EGR control method and device as well as engine system

A control method and control device technology, applied in the direction of charging system, engine components, engine control, etc., can solve the problem that the intake air flow sensor affects engine emissions, etc., and achieve the effect of compensating drift and avoiding emissions

Inactive Publication Date: 2020-11-27
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of this application is to provide an EGR control method, device and engine system, which is used to solve the problem in the prior art that the drift of the intake air flow sensor affects engine emissions

Method used

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  • EGR control method and device as well as engine system
  • EGR control method and device as well as engine system
  • EGR control method and device as well as engine system

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Embodiment Construction

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0058] The embodiment of the present application provides an EGR control method, which uses the measured Lambda value to correct the fuel injection quantity, so as to compensate the drift of the intake air flow sensor and avoid affecting the engine emission.

[0059] see figure 1 As shown, the control method may include the following steps:

[0060] S101. Obtain a measured Lambda value and a measured intake air volume.

[0061] In practical applications, the Lambda sensor can be u...

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Abstract

The invention provides an EGR control method and device as well as an engine system. The EGR control method comprises the following steps: obtaining an actually-measured Lambda value and actually-measured air inflow, and determining corrected fuel-injection quantity based on the actually-measured Lambda value, the actually-measured air inflow and the fuel-injection quantity; correcting the fuel-injection quantity based on the corrected fuel-injection quantity, determining set air inflow based on the corrected fuel-injection quantity and rotation speed of an engine, performing closed-loop control based on deviation of the set air inflow and the actually-measured air inflow, and controlling EGR based on air inflow obtained after closed-loop control. The fuel-injection quantity is corrected by utilizing the actually-measured Lambda value to compensate drift of an air inflow sensor, so that emission of the engine is prevented from being affected.

Description

technical field [0001] The present application belongs to the field of engine technology, and in particular relates to an EGR control method, device and engine system. Background technique [0002] In order to reduce engine NOx emissions, EGR (Exhaust Gas Recirculation, exhaust gas recirculation) technology is adopted. EGR means that the exhaust gas from the engine is reintroduced into the intake pipe and mixed with fresh gas to enter the combustion chamber for combustion. [0003] When performing EGR control, it is necessary to use an intake air flow sensor to measure the intake volume of fresh air entering the engine. [0004] In practical applications, the intake air flow sensor will drift due to the influence of pipelines, water vapor, dust, oil, etc. generated during operation, resulting in a decrease in the measurement accuracy of the intake air flow sensor. Furthermore, when the EGR control is performed based on the measurement result of the intake air flow sensor, ...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D41/30F02D41/14F02M26/05
CPCF02D41/0077F02D41/1401F02D41/1445F02D41/1475F02D41/1489F02D41/30F02D2041/1409F02D2041/1433F02M26/05Y02T10/40
Inventor 栾军山张晨
Owner WEICHAI POWER CO LTD
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