LAUSR

Abstract Represented here is an exhaust nitric oxide emission online detection method on a single-cylinder diesel engine, which is based on the tunable diode laser absorption spectroscopy. Considering the effects of different particle matter concentration in exhaust gas on detection accuracy, the direct detection approach was adopted. The wave number chosen in the present study was 1900. 07059 cm−1. The spectral parameters were calculated as a function of temperatures. And a thermo-couple was designed to detect the real-time temperature under different operating condition and modify the experimental results. All the experimental analysis demonstrated that the online detection system developed in the present study could realize the time resolution of 100 ms and effectively record the nitric oxide emission characteristics. With the high time resolution, the transient NO emission value under the transitional work condition was also obtained,which gives a new prospect to the future research on diesel engines.