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Evaluation of a FTIR emission measurement system for legislated emissions using a SI car

Lookup NU author(s): Professor Margaret Carol Bell CBE


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A series of chassis dynamometer test trials were conducted to assess the performance of a Fourier Transform Infra Red (FTIR) system developed for on-road vehicle exhaust emissions measurements. Trials used a EURO 1 emission-compliant SI passenger car which, alongside the FTIR, was instrumented to allow the routine logging of engine speed, road speed, throttle position, air-fuel ratio, air flow and fuel flow in addition to engine, exhaust and catalyst temperatures. The chassis dynamometer facility incorporated an "industry standard" measurement system comprising MEXA7400 gas analyzer and CVS bag sampling which was the "benchmark" for the evaluation of FTIR-legislated, gas-phase emissions (CO, NOx, THC and CO\d2) measurements. Initial steady state measurements demonstrated strong correlations for CO, NOx and THC (R\u2 of 0.99, 0.97 0.99, respectively) and a good correlation for CO\d2 (R\u2 \me 0.92). Subsequent transient and total mass emissions measurements from replicate samplings of four different driving cycles (two standard cycles, FTP75 and NEDC, and two novel cycles based on real-world data collected in Leeds) also show good response of FTIR and satisfied agreement between the FTIR and CVS bag sampling measurements. In general, the trial results demonstrate that the on-board FTIR emission measurement system provides reliable in-journey emissions data.

Publication metadata

Author(s): Li H, Ropkins K, Andrews GE, Daham B, Bell MC, Tate J, Hawley G

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: SAE Proceedings: Powertrain & Fluid Systems Conference & Exhibition

Year of Conference: 2006

Pages: 2006-01-3368

Publisher: SAE


Series Title: SAE technical Paper Series