一种立式OHV引擎振动抑制与防脱落闭环控制方法及系统

By performing order analysis and transmission path decomposition on the speed, vibration, and preload signals of the vertical OHV engine, a loosening damage index is constructed to achieve closed-loop control for vibration suppression and anti-detachment. This solves the problems of order vibration and loosening of fasteners in the vertical OHV engine, improving the reliability and safety of the system.

CN122085713BActive Publication Date: 2026-07-17HANGZHOU BENTU DIGITAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Vertical OHV engines exhibit significant order vibrations under typical operating conditions. The pre-tightening force of key fasteners is prone to decay, leading to safety hazards such as loosening and detachment. Existing technologies struggle to achieve effective closed-loop control for vibration suppression and detachment prevention.

Method used

By collecting signals related to engine speed, vibration, and preload, order analysis and transmission path decomposition inversion are performed to obtain the equivalent excitation of the fastened connection under load, construct the loosening damage index, and solve the active installation counter-excitation amplitude and phase under the dual constraints of vibration threshold and damage threshold. This leads to the linkage of re-tightening/compensation preload and torque and speed limiting measures, forming a self-renewing closed-loop control.

Benefits of technology

It significantly reduces the transmission of target-order vibrations, delays the accumulation of loosening damage, reduces the probability of detachment, improves the reliability and safety of the powertrain installation system, adapts to assembly tolerances, aging conditions and environmental changes, and achieves long-term stable control.

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Abstract

一种立式OHV引擎振动抑制与防脱落闭环控制方法及系统。采集引擎转速、至少两处振动信号及至少两处关键紧固连接的预紧力相关信号；对振动信号进行转速同步阶次分析获得目标阶次幅值与相位特征，并对预紧力相关信号进行温漂与零漂补偿得到预紧力状态；基于多测点阶次响应执行传递路径分解与反演，建立并在线辨识主动安装执行器—结构振动—紧固连接受载的协同传递模型，输出各连接在目标阶次下的轴向拉压与横向剪切等效激励；当指标越限时触发分级防脱落处置，执行复紧 / 补偿预紧力并进行闭环校验，和 / 或联动ECU限扭限速，并依据反馈自更新模型与阈值，实现减振与防脱落协同控制。
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Citation Information

Patent Citations

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