Method for realizing opening control of EGR (Exhaust Gas Recirculation) valve, device and system

A technology of EGR valve and opening value, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve the problems of high cost and unstable control accuracy, and achieve improved power, strong practicability and stable working performance. Effect

Active Publication Date: 2014-04-02
WEICHAI POWER CO LTD
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Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a method, device and system for realizing EGR valve opening control, so as to solve the problems of high cost and control accuracy in the closed-loop control of EGR valve using air flow in the prior art. unstable problem

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  • Method for realizing opening control of EGR (Exhaust Gas Recirculation) valve, device and system
  • Method for realizing opening control of EGR (Exhaust Gas Recirculation) valve, device and system
  • Method for realizing opening control of EGR (Exhaust Gas Recirculation) valve, device and system

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Embodiment Construction

[0059] In order to make the above objects, features and advantages of the present invention more comprehensible, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0060] Before the specific description of the method, device and system for controlling the opening of the exhaust gas recirculation EGR valve in this embodiment, the engine EGR system will be briefly described. The technology of recombustion on the intake side can reduce the nitrogen oxides (NOx) in the exhaust gas and improve the fuel consumption rate. The control of EGR mainly refers to the control of the opening of the EGR valve. See figure 1 As shown, the pipeline between the intake pipe of the engine and the exhaust pipe of the engine, the EGR cooler and the EGR valve form the EGR system, and the EGR system guides a part of the engine exhaust gas into the engine.

[0061] The method, device and sy...

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Abstract

The invention discloses a method for realizing opening control of an EGR (Exhaust Gas Recirculation) valve, a device and a system, which are used for lowering the cost and increasing the accuracy in the opening control of the EGR valve. The method comprises the following steps: acquiring the difference value between the discharge pressure of an engine and the intake pressure of the engine; searching for an EGR flow pulse spectrogram according to the difference value between the discharge pressure of the engine and the intake pressure of the engine and the current opening value of the EGR valve to obtain the current practical EGR flow; acquiring the total air inflow under a current working condition; dividing the current practical EGR flow by the total air inflow under the current working condition to obtain the current practical EGR rate; comparing the current practical EGR rate with an EGR rate set value under the current working condition, adjusting the opening value of the EGR valve through proportional-integral-differential (PID) control, and updating current opening value of the EGR valve.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a method, device and system for realizing EGR valve opening control. Background technique [0002] With the increasingly stringent engine emission regulations, EGR (Exhaust Gas Recycling, exhaust gas recirculation) is applied to the vehicle engine system. EGR is to separate part of the exhaust gas after combustion in the vehicle internal combustion engine and introduce it into the intake side. Recombustion technology can reduce nitrogen oxides (NOx) in exhaust gas and improve fuel consumption. [0003] The control of EGR mainly refers to the control of the opening of the EGR valve. In the prior art, the common EGR engine control method of EGR can adopt the closed-loop control based on the intake air flow rate, and control the intake air flow rate as the control target. The opening of the EGR valve and the actual value of the intake air flow are measured by the intake a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D21/08
Inventor 张展腾仲昆代子阳龚英利
Owner WEICHAI POWER CO LTD
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