This paper presents experimental data showing unexpected transient behaviour in several production universal exhaust gas oxygen (UEGO) sensors. The spike-like transients occur when passing through the stoichiometric point, and are particularly significant when passing from rich to lean. The paper illustrates how the spikes are affected by exhaust gas flow rate, deviation of air-to-fuel ratio (AFR) from stoichiometry, and rate of change of AFR while passing through stoichiometry. The spikes are most sensitive to the rate at which AFR passes through stoichiometry. Brief discussions on possible causes for the spikes, and on undesirable consequences for feedback control applications, are included.
Observations of Trans-stoichiometric AFR Spikes in UEGO Sensors
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 2000
2000-10-16
Conference paper
English
Observations of trans-stoechiometric air-fuel-ratio spikes in UEGO sensors
Automotive engineering | 2000
|Interpreting UEGO sensor measurements of mixture AFR
British Library Conference Proceedings | 1997
|Model Based Air Fuel Control with UEGO & HEGO
British Library Conference Proceedings | 1996
|UEGO-based Exhaust Gas Mass Flow Rate Measurement
SAE Technical Papers | 2012
|Interpreting UEGO sensor measurements of mixture air fuel ratio
Automotive engineering | 1997
|