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28-02-2024 | Electric, Fuel Cell, and Hybrid Vehicle, Engine and Emissions, Fuels and Lubricants, Heat Transfer, Fluid and Thermal Engineering

Misfire Detection Index Distinguishing the Difference of the Engine Angular Acceleration Between Two Specified Teeth of the Sensor Wheel

Author: Poong Gyoo Han

Published in: International Journal of Automotive Technology | Issue 3/2024

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Abstract

This study proposes the slope of the engine speed trend line (SlopeESTL) as a new misfire detection index for a four-cylinder engine, not limited to four-cylinder engines. SlopeESTL is defined as angular acceleration between the first and the last teeth of each cylinder in the cycle. SlopeESTL is flat and near 0 when the cylinder is normally combusted. A misfire leads to an abrupt decrease under the threshold. While it is affected by post oscillation just after misfires, there is enough margin between SlopeESTL of the misfired cylinder and post-oscillated SlopeESTL. The mean misfire detection and detection fault rates of the SlopeESTL were over 97% and under 1% in this study, making it a good misfire detection index. However, most of the first misfired cylinder on dual cylinder misfire can seldom be detected as a misfire at the high engine speed over 5000 rpm in the single cylinder misfire pattern. This is caused by the inertia force of the crankshaft system and is a demerit for the misfire detection index. It is one of the two RPM slopes used to calculate the Gap and ΔGap slopes proposed by the author. SlopeESTL can be used with Gap and ΔGap slopes, because they have their specific characteristics as misfire detection indices and their combination logic should be studied more. Furthermore, SlopeESTL can be affected by the machining tolerance of the teeth in the sensor wheel, torsional vibration, and non-uniformity in the stroke operation of the piston. However, it uses the tooth time measured using the existing crankshaft position sensor; an additional sensor is not required, which makes it economical.

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Literature
go back to reference Amend section 1968.2 of Title 13 (2015) California Code of Regulations (CCR), OBD II Regulatory documents. Amend section 1968.2 of Title 13 (2015) California Code of Regulations (CCR), OBD II Regulatory documents.
Metadata
Title
Misfire Detection Index Distinguishing the Difference of the Engine Angular Acceleration Between Two Specified Teeth of the Sensor Wheel
Author
Poong Gyoo Han
Publication date
28-02-2024
Publisher
The Korean Society of Automotive Engineers
Published in
International Journal of Automotive Technology / Issue 3/2024
Print ISSN: 1229-9138
Electronic ISSN: 1976-3832
DOI
https://doi.org/10.1007/s12239-024-00059-x

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