Rammer Tip-Over Detection via Engine Speed Threshold
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Solution Overview
Problem
Existing rammer tip-over detection systems require dedicated sensors, leading to increased complexity and potential delays in engine shutdown due to false vibrations and tilting during normal operation.
Innovation Solution
An apparatus utilizing an engine speed detection unit, a rammer tip-over discrimination unit, and an engine shutdown unit to promptly detect and respond to rammer tip-over by monitoring engine speed and shutting down the engine when it falls below a threshold value set lower than idling speed, eliminating the need for a dedicated sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated pressure sensor is used to detect tip-over, then tip-over detection capability is improved, but device complexity increases
Solution Approach 1:
The engine speed sensor serves dual purposes: monitoring engine speed during operation and detecting tip-over conditions. By utilizing the existing sensor's output for both functions, the system eliminates the need for a dedicated pressure sensor while maintaining reliable tip-over detection capability.
Solution Approach 2:
The existing engine speed sensor provides information that serves both its original function (speed monitoring) and the additional function (tip-over detection). The system leverages the sensor's inherent capabilities to perform multiple tasks without requiring additional dedicated components.
2Reliability
If a delay is introduced between tip-over detection and engine shutdown, then false detection due to vibration and tilting is reduced, but response time to actual tip-over increases
Solution Approach 1:
The system changes the detection parameter from static pressure (prone to false readings during vibration) to dynamic engine speed trends. By monitoring the rate of change and sustained low values of engine speed, the system achieves both rapid response and high accuracy in tip-over detection.
Solution Approach 2:
The system continuously monitors engine speed and uses feedback from successive measurements to distinguish between temporary fluctuations (vibration/tilting) and genuine tip-over conditions. The feedback mechanism allows the system to recognize the characteristic pattern of engine speed decline during tip-over while filtering out normal operational variations.
Data Source
AI summary
In an apparatus for detecting tip-over of a rammer equipped with a crankcase accommodating an output shaft rotatably connected to an engine, a movable unit accommodating a converter mechanism for converting rotation of the output shaft to vertical motion of a movable member, a tamping shoe connected to the movable unit, and a handle operable by an user, and adapted to thrust upward in the gravitational direction by the vertical motion of the movable member and go into a free fall to compact a ground surface, it is determined whether a detected engine speed becomes equal to or smaller than a threshold value set lower than an engine idling speed when the engine has been operated at a rammer working speed set greater than the engine idling speed, and if it does, it is discriminated that the rammer has tipped over.