Diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling EGR rate
A technology for precise control of diesel engines, applied in the field of diesel EGR systems, can solve problems affecting engine emission indicators, etc., and achieve the effects of low production consistency requirements, improved emission consistency, and good durability
Inactive Publication Date: 2015-12-30
WUXI LONGSHENG TECH
View PDF5 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
As the emission standards become more and more stringent, it is very common for diesel engines to use the EGR system. Most of the control strategies of the EGR system that meet the non-road National III standard use the opening of the EGR valve as the target of the closed-loop control, so when If the production consistency of the EGR valve or the pipeline in the EGR system is not done well, or when the gas flow area of the entire EGR system changes after the engine has been used for a long time, the EGR rate will change, thereby affecting the engine's emission indicators
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0012] A diesel engine EGR system capable of precisely controlling the EGR rate, its structure is as follows figure 1 As shown, it includes an EGR valve 2, an ECU control unit 1 and a signal acquisition unit. The input end of the ECU control unit is connected to the signal acquisition unit, and the output end of the ECU control unit is connected to the controlled end of the EGR valve. The ECU control unit 1 is used to control the opening of the EGR valve according to the information collected by the signal collection unit, so as to further accurately control the EGR rate of the engine under each working condition.
[0013] In this embodiment, the signal acquisition unit includes an air flow sensor 5, the air flow sensor 5 is installed on the air intake port of the engine, and is used to monitor the flow of fresh air entering the engin...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling the EGR rate. The system comprises an EGR valve, and an ECU control unit for controlling the opening degree of the EGR valve, wherein the input end of the ECU control unit is connected with a signal collection unit; the output end of the ECU control unit is connected with the controlled end of the EGR valve; the signal collection unit comprises an air flow sensor connected with the input ports of the ECU control unit. According to the system, air flow entering an engine is used as a control target, so that an aim of accurately controlling the EGR rate of the engine under various working conditions. The system can not be influenced by pipeline change and production consistency and has the characteristics of being high in control accuracy, stable in control, good in durability and low in production consistency requirement on parts such as the EGR valve.
Description
technical field [0001] The invention relates to the technical field of diesel engines, in particular to a diesel EGR system. Background technique [0002] In the engine exhaust gas recirculation system (abbreviation, EGR system), the exhaust gas flow can be adjusted by adjusting the opening of the EGR valve, so that the exhaust gas and fresh air are mixed in a certain proportion and then returned to the cylinder for recirculation, so as to reduce the combustion temperature in the cylinder as well as the combustion velocity, further thereby reducing NO X emissions. As the emission standards become more and more stringent, it is very common for diesel engines to use the EGR system. Most of the control strategies of the EGR system that meet the non-road National III standard use the opening of the EGR valve as the target of the closed-loop control, so when If the production consistency of the EGR valve or the pipeline in the EGR system is not done well, or when the gas flow a...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): F02D41/00F02D41/02F02D41/18
Inventor 于政
Owner WUXI LONGSHENG TECH