Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Exhaust gas flow measuring system and measuring method and closed loop control method

A technology of flow measurement and exhaust gas, applied in electrical control, exhaust gas recirculation, charging system, etc., can solve the problems of inaccurate calculation of exhaust gas flow and influence on emission, and achieve the goal of avoiding unreasonable design, reducing pressure loss and simple layout Effect

Inactive Publication Date: 2019-01-15
WEICHAI POWER CO LTD
View PDF8 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high design requirements of the Venturi flowmeter, once the design is unreasonable, the calculation of the exhaust gas flow will be inaccurate and the emission will be affected.

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Exhaust gas flow measuring system and measuring method and closed loop control method
  • Exhaust gas flow measuring system and measuring method and closed loop control method
  • Exhaust gas flow measuring system and measuring method and closed loop control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] EGR: Exhaust Gas Recirculation, exhaust gas recirculation, the exhaust gas from the engine is reintroduced into the intake pipe and mixed with fresh gas before entering the combustion chamber for combustion, which can effectively reduce engine NOx emissions.

[0049]EGR valve: Control the flow of exhaust gas through different opening degrees.

[0050] EGR valve flow characteristics: When the pressure drop through the EGR valve is constant, the relations...

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

No PUM Login to View More

Abstract

The invention provides an exhaust gas flow measuring system and measuring method and a closed loop control method. A temperature sensor, a first pressure sensor and a second pressure sensor are addedon the basis of an EGR system and an engine controller of the system. The engine controller calculates theoretical exhaust gas flow in different opening of an EGR valve according to relative data fedback by the temperature sensor, the first pressure sensor and the second pressure sensor. Flow coefficient of EGR valve under different opening can be obtained by using flow characteristics of the EGRvalve. Actual exhaust gas flow of the EGR valve under different opening is obtained by modifying the theoretical exhaust gas flow by the flow coefficient. According to the system, the flow can be calculated without components such as a Venturi Flowmeter, and therefore incorrect calculation of exhaust gas flow caused by unreasonable design of the Venturi Flowmeter can be avoided.

Description

technical field [0001] The invention relates to the technical field of engines, and more specifically relates to an exhaust gas flow measurement system, a measurement method and a closed-loop control method. Background technique [0002] With the increasingly stringent emission regulations, EGR (Exhaust Gas Recirculation, exhaust gas recirculation) technology has been widely used as the main measure to reduce NOx. [0003] At this stage, the closed-loop strategy based on EGR exhaust gas flow requires components such as Venturi flow meters for flow calculation. However, due to the high design requirements of the Venturi flowmeter, once the design is unreasonable, the calculation of the exhaust gas flow will be inaccurate and the emission will be affected. Contents of the invention [0004] In view of this, in order to solve the above problems, the present invention provides an exhaust gas flow measurement system, a measurement method and a closed-loop control method, the t...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/47F02D41/00
Inventor 张广西王新校代子阳杨豫魁姚旺刘学哲
Owner WEICHAI POWER CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com