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A Production Wide-Range AFR Sensor Response Diagnostic Algorithm for Direct-Injection Gasoline Application
Technical Paper
2001-01-0558
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
A wide-range Air-Fuel Ratio sensor (WRAF) response diagnostic algorithm was developed for production application in Gasoline Direct Injection (Gas-DI) powertrains to fulfill On Board Diagnostic (OBD) legislative requirements [1] for wide-range oxygen sensors. The algorithm measures the response of a wide-range air-fuel ratio (AFR) sensor signal to an input AFR signal of known amplitude to determine whether degradation in sensor responsiveness is severe enough to cause a failure of legal emissions requirements.
A practical IIR (Infinite Impulse Response) digital bandpass filter design was used in series with a rectifier and low-pass filter to process the AFR sensor signal for comparison to a reference signal amplitude. The IIR filter was designed with a moveable pass-band to enable the algorithm to be used at variable frequencies during intrusive and non-intrusive sensor diagnostic tests.
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Citation
Maloney, P., "A Production Wide-Range AFR Sensor Response Diagnostic Algorithm for Direct-Injection Gasoline Application," SAE Technical Paper 2001-01-0558, 2001, https://doi.org/10.4271/2001-01-0558.Also In
Electronic Engine Controls: Modeling, Controls, Obd and Neural Networks
Number: SP-1585; Published: 2001-03-05
Number: SP-1585; Published: 2001-03-05
References
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- Maloney, P. “A Production Wide-Range AFR Control Algorithm for Direct Injection Gasoline Application” SAE # 2001-01-0558 February 2000
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