Research on Characterization Parameters for Engine Valve Clearance Based on Vibration Signals Chongqing University of Technology, Key Laboratory of Advanc

Format:

Book

Conference/Event

Author/Creator:

Ji, Shaobo, author.

Contributor:

Dong, Yiming

Liao, Guoliang

Lu, Yueqi

Pan, Chi

Yue, Yuanhang

Conference Name:

Automotive Technical Papers (2026-01-01 : Warrendale, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2026

Summary:

To address mechanical faults caused by abnormal engine valve clearance, this study investigates the extraction methods of vibration signal feature parameters. A six-cylinder diesel engine test bench was established to collect cylinder head vibration signals under varying rotational speeds, torque loads, and valve clearance conditions. Four timedomain parameters, including peak-to-peak values, rectified average values, standard deviations, and root mean square amplitude, were extracted alongside the energy distribution of frequency bands obtained through wavelet packet decomposition. The correlations between these parameters and valve clearance states were systematically analyzed. The results demonstrated that all parameters exhibited significant increasing trends with elevated rotational speeds, whereas torque variations exerted minimal influence. Abnormal valve clearance induces significant amplitude increases in timedomain parameters. The energy within frequency bands 58 (612 kHz) derived from wavelet packet decomposition demonstrates marked sensitivity to valve clearance variations. These findings provide effective technical support for online monitoring of engine valve clearance and early fault warning systems

Notes:

Vendor supplied data

Publisher Number:

2026-01-5005

Access Restriction:

Restricted for use by site license