Engine Mount Damping Limiting Member for Abnormal Noise Reproduction
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Solution Overview
Problem
Current methods for reproducing abnormal noises in vehicle passenger compartments due to vibrations are cumbersome, require significant equipment investment, and are costly, as they necessitate driving the vehicle and using a vibration exciter.
Innovation Solution
A method involving a damping limiting member installed on the engine mount and a gearshift lever in neutral position to increase engine rotational speed, allowing vibrations to be transmitted to the vehicle body without damping, thereby reproducing abnormal noises at rest, and a jig with a support member that cancels the damping function of the engine mount to facilitate noise reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration exciter is used to reproduce abnormal noise, then the abnormal noise can be reproduced, but substantial equipment investment and installation costs are required
Solution Approach 1:
The invention extracts the essential function of vibration reproduction from the complex vibration exciter equipment. By removing the engine mount's damping capability through the damping limitation member, the system uses the engine itself as a vibration source, eliminating the need for external vibration exciter equipment while maintaining the ability to reproduce abnormal noises.
Solution Approach 2:
The engine serves dual purposes: as the power source for vehicle operation and as the vibration source for reproducing abnormal noises. The damping limitation member enables the engine to directly provide vibrations to the vehicle body without requiring separate diagnostic equipment, making the system self-sufficient for noise reproduction.
2Reliability
If the vehicle is driven to reproduce abnormal noise, then the noise can be reproduced, but the process is troublesome and requires a driving course
Solution Approach 1:
The invention separates the vibration reproduction function from the vehicle driving function. By using the damping limitation member to enable vibration transmission while the vehicle is stationary, the diagnostic process is divided into independent steps: installing the limitation member, running the engine, and observing vibrations, eliminating the need for complex driving courses.
Solution Approach 2:
The damping limitation member is installed beforehand to prepare the engine mount for vibration transmission. This preliminary action enables the engine to transmit vibrations to the vehicle body before actual operation, allowing abnormal noise reproduction to occur during normal engine running without requiring special driving conditions or courses.
3Speed
If the gearshift lever is not in neutral position, then the vehicle can be propelled, but vibrations cannot be effectively transmitted to the vehicle body
Solution Approach 1:
The invention creates a dynamic condition where the gearshift lever is held in neutral position during the diagnosis process. This dynamic state allows the engine to operate at various rotational speeds while the damping limitation member ensures vibrations are transmitted to the vehicle body, enabling effective noise reproduction without vehicle propulsion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and cost-effective reproduction of abnormal noises by allowing workers to confirm noise generation locations without actual vehicle movement, using a simple and versatile jig that can handle various vehicle types and configurations.
Implementation Method 1
transmit vibrations of the engine to the vehicle body
Implementation Method 2
engine mount which supports the engine on the vehicle body in a damping fashion
Implementation Method 3
damping limiting member for limiting a damping function of an engine mount
Data Source
AI summary
A method of reproducing abnormal noise comprises: a step of starting an engine while buffer suppressing members for suppressing the buffer function of an engine mount are mounted on the engine mount which buffer-mounts on a vehicle body an engine for driving a vehicle and a shift lever for driving is maintained in a neutral position; and a step of opening and closing the accelerator of the engine while the shift lever for driving is maintained in a neutral position. In the method of reproducing abnormal noise, jigs are used.