EGR control system and method for instantaneous conditions of internal combustion engine

A technology for transient working conditions and control systems, applied in engine control, mechanical equipment, machines/engines, etc., can solve problems such as deterioration of NOx emissions, failure to achieve comprehensive optimization of smoke and NOx, and achieve reduction of harmful emissions, Effect of improving trade-off relationship and reducing NOx emissions

Inactive Publication Date: 2014-05-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can effectively reduce the smoke emission under transient conditions, it also causes the deterioration of NOx emission and fails to achieve the purpose of comprehensive optimization of smoke and NOx

Method used

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  • EGR control system and method for instantaneous conditions of internal combustion engine
  • EGR control system and method for instantaneous conditions of internal combustion engine
  • EGR control system and method for instantaneous conditions of internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The detailed working process under the transient condition with loading time of 2s is as follows:

[0043] (1) First, according to the actual needs of the smoke control target and the test calibration value, set the upper limit value of the smoke level, the upper limit value of the smoke level control area and the lower limit value of the smoke level control area in the electronic control unit (ECU) 6 . In this embodiment, the upper limit value of smoke is 10% (extinction smoke value), the upper limit of smoke control area is 8%, and the lower limit of smoke control area is 4%;

[0044] (2) Electronic control unit (ECU) 6. Collect the speed, torque and EGR valve opening signal of the diesel engine. When the torque transient rate of the engine is detected to be 278N.m·s -1 , it is determined that the engine is in a transient condition, and the following commands are quickly executed:

[0045] (3) The electronic control unit (ECU) 6 converts the EGR valve opening into th...

Embodiment 2

[0051] The detailed working process under the transient condition with loading time of 10s is as follows:

[0052] (1) First, according to the actual needs of the smoke control target and the test calibration value, set the upper limit value of the smoke level, the upper limit value of the smoke level control area and the lower limit value of the smoke level control area in the electronic control unit (ECU) 6 . In this embodiment, the upper limit value of smoke is 10% (extinction smoke value), the upper limit of smoke control area is 8%, and the lower limit of smoke control area is 4%;

[0053] (2) Electronic control unit (ECU) 6. Collect the speed, torque and EGR valve opening signal of the diesel engine. When the torque transient rate of the engine is detected to be 55.6N.m·s -1 , it is determined that the engine is in a transient condition, and the following commands are quickly executed:

[0054] (3) The electronic control unit (ECU) 6 converts the EGR valve opening into ...

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Abstract

The invention provides an EGR control system and method for instantaneous conditions of an internal combustion engine. The method comprises the steps that firstly, an upper limit value of smoke intensity control, an upper smoke intensity limit control area, a lower smoke intensity limit control area, a limit of a higher transient rate and a limit of a lower transient rate are determined according to the development requirement, wherein the upper limit value of the smoke intensity is larger than an upper limit value of the smoke intensity control area, and the upper limit value of the smoke intensity control area is larger than a lower limit value of the smoke intensity control area; in the initial period of transient of the internal combustion engine, due to the lower smoke intensity value, the larger EGR rate can be adopted to correspond to a larger gear of an EGR valve; along with the development of the transient process, the smoke intensity begins to be increased, and when the upper limit value of the smoke intensity is reached, the smoke intensity is decreased along with the reduction of the gear of the EGR valve until the EGR valve is completely closed; in the latter half period of the transient process, the smoke intensity begins to be decreased from the peak to be lower than the lower smoke intensity limit control area, and at the moment, when it is ensured that the smoke intensity does not exceed the upper smoke intensity limit control area, the gear of the EGR valve is enlarged step by step so as to achieve the aim of optimizing NOx emission. According to the EGR control system and method for the instantaneous conditions of the internal combustion engine, carbon smoke emission under the instantaneous conditions of the internal combustion engine can be effectively controlled, and emission of the NOx noxious substances is reduced as much as possible.

Description

technical field [0001] The invention belongs to the field of emission control under transient operating conditions of internal combustion engines, and in particular relates to a transient emission control system and method using smoke emission as a limit value and utilizing EGR valve opening degree feedback control. Background technique [0002] Due to the advantages of strong power, good economy and high reliability, internal combustion engines have attracted much attention, and their share in the automotive engine market is increasing. However, automotive internal combustion engines are in transient conditions most of the time, especially On urban roads, the load and speed of the engine change more frequently. The supercharged internal combustion engine works under transient conditions, and its combustion and emission performance will be distorted differently from the steady state conditions. With the increasingly stringent emission regulations for vehicle internal combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D21/08
Inventor 刘忠长田径张龙平韩永强许允
Owner JILIN UNIV
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