Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate

A technology of exhaust gas recirculation rate and gasoline engine, which is applied in the direction of measuring device, engine test, machine/structural component test, etc. It can solve the problems of inability to realize EGR rate closed-loop control, lack of EGR rate, combustion instability, etc.

Inactive Publication Date: 2005-02-23
ZHEJIANG UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the EGR rate is too high, it will lead to unstable combustion, and if it is too small, the effect of reducing emissions cannot

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
  • Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate
  • Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate
  • Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0066] refer to figure 1 , the measuring device specially designed for implementing the above measuring method is to connect a sequentially connected resistor R1, R2 and power supply E at the junction of the spark plug 1 and the distributor 2 of the gasoline engine cylinder of the vehicle, and connect it in parallel with the spark plug 1; The connection of R1 and R2 is connected with an isolation circuit 3, a filter circuit 4, an amplifier circuit 5, and a single-chip microcomputer 6, in which a DC bias voltage of 200--500V is positively applied between the electrodes of the spark plug 1, after isolation and filtering , After being amplified, it is sent to the single chip microcomputer for sampling and recording. The sampling frequency is 10KHz. The EGR rate of the test engine is controlled by a linear proportional valve driven by a stepping motor, and its opening is determined by the PWM output of the microcontroller. Under the condition that other conditions remain unchang...

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

A method for on-line measuring waste gas recirculation ratio of vehicle gasoline engine includes executing DC bias voltage forward direction in between spark plug and electrode to change ion directional movement to be ion current; sending it to monolithic computer for sampling and recording after isolating, filtering and amplifying; measuring out waste gas recirculation ratio based on linear coorelation of recirculation ratio to peak value and peak value area. A device for realizing the method is also disclosed by the present invention.

Description

technical field [0001] The invention relates to a method and device for measuring the exhaust gas recirculation rate of a gasoline engine for vehicles Background technique [0002] With the increase of vehicles and the intensification of environmental pollution, the requirements for engine emissions are becoming increasingly stringent. my country is about to adopt Euro II and Euro III standards. These stringent standards mean that emissions must be reduced from the engine itself. Combined with three-way catalytic conversion and other methods, exhaust gas recirculation, or EGR (Exhaust Gas Recirculation), introduces part of the exhaust gas into the combustion chamber after cooling, which can not only reduce HC and CO emissions, but also reduce NO x emission. However, if the EGR rate is too high, it will lead to unstable combustion, and if it is too small, the effect of reducing emissions cannot be achieved. Due to the lack of means to measure the EGR rate online in real 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
IPC IPC(8): G01M15/00
Inventor 许沧粟
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap