Engine Oil Level Detection with Vibration-Resistant Mode Switching
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Solution Overview
Problem
Existing oil level detection apparatuses for engines are inefficient in accurately and reliably detecting oil levels, especially in mobile work machines where vibrations cause fluctuations, leading to false alarms and unnecessary engine shutdowns, and require separate systems for stationary and mobile machines, increasing management time and costs.
Innovation Solution
An oil level detection apparatus with mode switching units that allow for two operational modes: one for actuating an alarm and stopping the engine, and another for continuing operation, using a float-type oil level detector with movable contacts and fixed contacts, and determination units that differentiate between engine states to provide accurate level detection, reducing the need for multiple systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float-type oil level detector with movable contacts is used to detect oil level drops, then the detection mechanism is simple and reliable, but vibrations in mobile work machines cause fluctuations that lead to false alarms and unnecessary engine shutdowns
Solution Approach 1:
The system dynamically adapts its detection criteria based on engine operating state. When the engine is running, vibrations are expected and the system requires multiple consecutive detections (e.g., 3 out of 5 cycles) to confirm low oil level. When the engine is stopped, vibrations cease and a single detection is sufficient to trigger an alarm. This dynamic adjustment of detection thresholds resolves the contradiction between simplicity and accuracy under varying conditions.
Solution Approach 2:
The detection parameters (sensitivity thresholds, confirmation requirements) are changed based on engine state. The system modifies its operational parameters - requiring higher confidence levels during vibration-prone operating conditions and lower thresholds when stationary - thereby maintaining detection reliability while preventing false alarms across different operational contexts.
2Reliability
If separate oil level detection systems are provided for stationary and mobile work machines, then each system can be optimized for its specific application, but management time and costs increase
Solution Approach 1:
A single oil level detection apparatus is designed to universally serve both stationary and mobile work machine applications. The system incorporates engine state detection capability and automatically adjusts its operational mode accordingly - operating in high-sensitivity mode for stationary machines and vibration-tolerant mode for mobile machines. This multi-functionality eliminates the need for separate systems while maintaining optimized performance for each application type.
Solution Approach 2:
The unified system dynamically switches between different operational configurations based on detected engine state and application type, rather than requiring physically separate systems. This dynamic adaptability allows one apparatus to fulfill the roles of multiple specialized systems, reducing overall complexity while preserving application-specific optimization.
3Reliability
If the oil level detection apparatus stops the engine automatically when oil level drops, then engine damage is prevented, but false shutdowns occur due to vibrations in mobile work machines
Solution Approach 1:
The engine shutdown function is dynamically controlled based on detection confidence levels. During engine operation in mobile machines, the system requires multiple consecutive low oil level detections before triggering shutdown, preventing premature shutdowns due to vibrations. When the engine is stopped or in stationary applications, the system responds more immediately to single detections. This dynamic control strategy protects the engine from damage while maintaining operational continuity during normal vibration-induced fluctuations.
Solution Approach 2:
The system applies preliminary filtering and confirmation requirements before executing the harmful action of engine shutdown. By requiring multiple consecutive detections or higher confidence thresholds before triggering shutdown, the system preemptively prevents false shutdowns while still maintaining the protective function against genuine low oil level conditions.
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 accurate and reliable oil level detection in both stationary and mobile engines with a single apparatus, reducing management time and costs by allowing mode switching based on engine state, and improving detection accuracy by distinguishing between actual and temporary level drops.
Implementation Method 1
a float-type oil level detector (50) for detecting the level of oil (Lu) pooled in the crankcase (11). The oil level detector (50) is composed of a case main body (51), a float chamber (53) formed by being enclosed in the case main body (51), a float (54) that is elevatably accommodated in the float chamber (53)... a movable contact (55) disposed on the bottom surface of the float (54), and a pair of fixed contacts (56)
Data Source
AI summary
An oil level detection apparatus having a float-type oil level detector (50) and a mode switching unit. The oil level detector emits a signal indicating that the oil level has dropped when a movable contact disposed on a float (54) makes contact with fixed contacts once the level of oil (Lu) has dropped to a lower limit level. The mode switching unit switches between one of two modes selected from a first mode for actuating the alarm and stopping the engine (10) in accordance with the level drop signal, and a second mode for actuating the alarm and continuing to operate the engine (10) in accordance with the level drop signal.