Transient Exhaust Gas Recirculation Ratio Measurement Utilizing Heated NDIR Method Horiba, Limited

Format:

Conference/Event

Author/Creator:

Yoshimura, Yoshimura, author.

Contributor:

Miyai, Masaru

Nakamura, Hiroshi

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Most of the recent clean diesel engines are equipped with anexhaust gas recirculation (EGR) technology in order to meet thestrict criteria of NOx and particulate matter (PM) as required inthe current emission regulations. More attention to strict EGRcontrol is becoming required. Accurate and fast transient EGR ratiooperation is becoming very critical in the field of the emissioncontrol.The EGR ratio is typically monitored by CO₂ trace method, inwhich CO₂ emitted from engine, is utilized as a tracer gas. The EGRratio can be obtained from CO₂ concentration measured at engineintake and engine out at the same time. In this study, authors havedeveloped a new EGR analyzer consisting of two CO₂ detectors, toachieve required performance for transient measurement, id est, shortdelay time and quick response, negligible difference between twoCO₂ detectors, and capability of wet measurement. For this newanalyzer, heated NDIR detectors which can measure CO₂ in engineemission under wet condition were adopted. The sample lines foreach CO₂ detector were configured to have small volume and alsoalmost same design as each other, to avoid transient errors causedby the difference in response time.We have evaluated the performance of the transient EGR analyzerthrough some comparison tests with a conventional exhaust gasanalyzers system. In consequence, the faster response has beenobserved from the transient EGR analyzer without significanttransient error under several test cycles. Furthermore it hasproved that effects on response time from the sample inlet pressurechange are significantly small. Finally the EGR ratio measured bythe transient EGR analyzer followed up the EGR valve operationwell. These results show the advantages of the transient EGRanalyzer for measuring EGR ratio under transient state

Notes:

Vendor supplied data

Publisher Number:

2012-01-0886

Access Restriction:

Restricted for use by site license