Variable supercharged engine EGR rate feedback control method based on air inlet flowmeter information

A technology of supercharged engine and intake air flow, applied in engine control, electrical control, machine/engine, etc., can solve problems such as difficulty in accurately controlling EGR rate, to avoid EGR rate fluctuations, ensure consistency, and achieve precise control. Effect

Inactive Publication Date: 2017-10-24
JILIN UNIV
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Problems solved by technology

[0005] In order to solve the problem that it is difficult to accurately control the EGR rate under the normal working conditions of the variable supercharged engine, the present invention provides an engine EGR rate feedback control method based on the intake air flowmeter information

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  • Variable supercharged engine EGR rate feedback control method based on air inlet flowmeter information
  • Variable supercharged engine EGR rate feedback control method based on air inlet flowmeter information
  • Variable supercharged engine EGR rate feedback control method based on air inlet flowmeter information

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the drawings:

[0019] In order to introduce the content of the present invention in detail, some related concepts are defined:

[0020] Definition 1. Reference intake air flow: Under a certain working condition, when the EGR valve is closed, after calibrating the VNT opening, the total air flow entering the engine cylinder, use q 0 To represent;

[0021] Definition 2: The target intake flow of fresh air: refers to the fresh intake flow required to reach the target EGR rate under the current operating conditions, and q is used in this article Fair1 To represent;

[0022] Definition 3. The actual intake flow of fresh air: refers to the actual fresh intake flow calculated by the intake air flow sensor under the current operating conditions of the engine. In this paper, q Fair2 To represent;

[0023] Definition 4: Intake air flow deviation: refers to the difference between the actual intake air flow of the...

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Abstract

The invention provides a variable supercharged engine EGR rate feedback control method based on air inlet flowmeter information. The method comprises the steps that 1, a standard air inlet flow pulse spectrum and a target EGR rate pulse spectrum are queried to obtain standard air inlet flow and target EGR rate; 2, an EGR valve basic-opening-degree pulse spectrum is queried to obtain an EGR valve opening degree base value; 3, the target inlet flow of fresh air of an engine is calculated, the actual air inlet flow of the fresh air of the engine is measured, and an air inlet flow deviation of the fresh air of the engine is calculated; 4, an EGR valve correction opening degree pulse spectrum is queried to obtain an EGR valve opening degree correction value; 5, the sum of the EGR valve opening degree base value and the EGR valve opening degree correction value is an EGR valve opening degree target value; 6, an actual EGR valve opening degree value is measured and is regulated by using an EGR valve PID controller to make the actual value consistent to the EGR valve opening degree target value. By adopting the method, the consistency between the actual EGR rate and the target EGR rate is ensured on the basis that rapid responsiveness of an EGR system is ensured.

Description

Technical field [0001] The invention belongs to the field of combustion engine control, and relates to a variable supercharged engine EGR rate feedback control method based on intake flow meter information, and in particular to a method based on the intake state change caused by the coupling control of VNT and EGR. The actual information of the air flow meter is calculated and corrected the EGR valve opening degree, which can accurately control the feedback control strategy of the engine EGR rate. Background technique [0002] The EGR (Exhaust Gas Recirculation, hereinafter referred to as EGR) system reintroduces part of the exhaust gas into the cylinder through the pipeline, thereby achieving the purpose of reducing engine nitrogen oxide emissions. VNT (VariableNozzle Turbo variable supercharging, hereinafter referred to as VNT) Under normal operating conditions, the main component of exhaust gas is inert gas that does not participate in combustion. Introducing part of it into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D21/08F02D41/14F02D41/18
Inventor 江涛林学东李德刚杨淼史乃晨
Owner JILIN UNIV
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